KS3 Science-Chemistry Quiz on "Acids, alkalis, salts and simple chemical reactions" (based on QCA 7E & 7F)

This symbol means a chemical is? [7e-1]
1. corrosive
2. harmful
3. an irritant
4. toxic
This symbol means a chemical is? [7e-2]
1. corrosive
2. harmful
3. oxidising
4. toxic
This symbol means a chemical is? [7e-3]
1. an oxidising agent
2. toxic
3. an irritant
4. corrosive
This symbol means a chemical is? [7e-4]
1. corrosive
2. harmful
3. an irritant
4. toxic
Which is the strongest alkali? [7e-5]
1. limewater
2. baking soda
3. vinegar
4. wine
Which is the weakest alkali? [7e-6]
1. limewater
2. baking soda
3. vinegar
4. wine
Which is the strongest acid? [7e-7]
1. limewater
2. baking soda
3. vinegar
4. wine
Which is the weakest acid? [7e-8]
1. limewater
2. baking soda
3. vinegar
4. wine
Which of the following can be mixed to form a neutral solution? [7e-9]
1. limewater and fizzy drink
2. baking soda and toothpaste
3. vinegar and wine
4. calomine lotion and common salt
Which of the following can be mixed to form a neutral solution? [7e-10]
1. limewater and washing soda
2. baking soda and wine
3. vinegar and common salt
4. ammonia and limewater
Which of the following can be safely used to treat an acid bee sting? [7e-11]
1. limewater
2. wine
3. calomine lotion
4. common salt
Which of the following can be safely used to treat an alkaline wasp sting? [7e-12]
1. calomine lotion
2. common salt
3. washing soda
4. vinegar
Which of the following is most likely to be part of an antacid indigestion medicine? [7e-13]
1. sodium hydrogencarbonate
2. ammonia
3. washing soda
4. limewater
Which of the following is the safest to use to treat an acid nettle sting? [7e-14]
1. wine
2. sodium hydrogencarbonate
3. washing soda
4. limewater
A small amount of a dense white powder was mixed with water in a test tube and the mixture well shaken. None of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned blue. This meant the white powder was? [7e-15]
1. a soluble neutral substance
2. a slightly soluble acid
3. a very soluble alkali
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube and the mixture well shaken. Some of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned blue. This meant the white powder was? [7e-16]
1. a soluble neutral substance
2. a slightly soluble acid
3. a very soluble alkali
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube and the mixture well shaken. None of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned green. This meant the white powder was? [7e-17]
1. a soluble neutral substance
2. a slightly soluble acid
3. a slightly soluble neutral substance
4. a soluble alkali
A small amount of a dense white powder was mixed with water in a test tube and the mixture well shaken. Some of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned green. This meant the white powder was? [7e-18]
1. a soluble acidic substance
2. a slightly soluble neutral substance
3. a soluble acidicl substance
4. a slightly soluble alkali
A small amount of a dense white powder was mixed with water in a test tube and the mixture well shaken. None of the white powder sank to the bottom of the test tube. A few drops of universal indicator were added and the solution turned orange. This meant the white powder was? [7e-19]
1. a soluble weak alkali
2. a very soluble neutral substance
3. a soluble weak acid
4. a slightly soluble strong acid
A small amount of a dense white powder was mixed with water in a test tube. Some of the white powder sank to the bottom of the test tube and the mixture well shaken. A few drops of universal indicator were added and the solution turned red. This meant the white powder was? [7e-20]
1. a soluble weak alkali
2. a slightly soluble neutral substance
3. a soluble weak acid
4. a slightly soluble strong acid
Which of the following is the pH of a strong acid? [7e-21]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of the following is the pH of a strong alkali? [7e-22]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of the following is the pH of a weak acid? [7e-23]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of the following is the pH of a weak alkali? [7e-24]
1. pH 1
2. pH 14
3. pH 5
4. pH 9
Which of these is a weak acid? [7e-25]
1. fizzy lemonade (flavouring + carbonated water)
2. battery acid (sulphuric acid)
3. salt solution (aqueous sodium chloride)
4. oven cleaner (ammonia solution)
Which of these forms the most corrosive liquid? [7e-26]
1. fizzy lemonade (flavouring + carbonated water)
2. battery acid (sulphuric acid)
3. salt solution (aqueous sodium chloride)
4. oven cleaner (ammonia solution)
Which of these gives a neutral solution in water? [7e-27]
1. fizzy lemonade (flavouring + carbonated water)
2. battery acid (sulphuric acid)
3. salt solution (aqueous sodium chloride)
4. oven cleaner (ammonia solution)
Which of these is a weak alkali in solution? [7e-28]
1. fizzy lemonade (flavouring + carbonated water)
2. battery acid (sulphuric acid)
3. salt solution (aqueous sodium chloride)
4. oven cleaner (ammonia solution)
A substance was dissolved in water containing universal indicator. The indicator turned red. This shows the dissolved substance was a? [7e-29]
1. strong acid
2. weak acid
3. strong alkali
4. weak alkali
A substance was dissolved in water containing universal indicator. The indicator turned orange. This shows the dissolved substance was a? [7e-30]
1. strong acid
2. weak acid
3. strong alkali
4. weak alkali
A substance was dissolved in water containing universal indicator. The indicator turned violet. This shows the dissolved substance was a? [7e-31]
1. very weak acid
2. weak acid
3. strong alkali
4. weak alkali
A substance was dissolved in water containing universal indicator. The indicator turned pale blue. This shows the dissolved substance was a? [7e-32]
1. strong acid
2. very weak acid
3. very strong alkali
4. weak alkali
A substance was dissolved in water containing universal indicator. The indicator turned yellow. This shows the dissolved substance was a? [7e-33]
1. very weak acid
2. weak alkali
3. very strong alkali
4. moderately strong acid
A substance was dissolved in water containing universal indicator. The indicator turned dark green. This shows the dissolved substance was a? [7e-34]
1. very weak acid
2. very weak alkali
3. moderately strong alkali
4. moderately strong acid
A substance was dissolved in water containing universal indicator. The indicator turned light green. This shows the dissolved substance was a? [7e-35]
1. very weak acid
2. very weak alkali
3. nearly neutral substance
4. moderately strong alkali
A substance was dissolved in water containing universal indicator. The indicator didn't change colour. This shows the dissolved substance was probably a? [7e-36]
1. very weak acid
2. very weak alkali
3. substance neutralised by water
4. nearly neutral substance
The diagram shows a more elaborate and more accurate way of doing a neutralisation reaction using a conical flask, pipette and burette.
Given the general word equation for neutralisation: acid + alkali ==> salt + water
What pH value would the acid have on its own in water? [7e-37]
1. pH 1
2. pH 14
3. pH 7
4. pH 8
The diagram shows a more elaborate and more accurate way of doing a neutralisation reaction using a conical flask, pipette and burette.
Given the general word equation for neutralisation: acid + alkali ==> salt + water
What pH value would the alkali have on its own in water? [7e-38]
1. pH 1
2. pH 14
3. pH 7
4. pH 6
The diagram shows a more elaborate and more accurate way of doing a neutralisation reaction using a conical flask, pipette and burette.
Given the general word equation for neutralisation: acid + alkali ==> salt + water
What pH value would the solution be at the end of the reaction? [7e-39]
1. pH 6
2. pH 10
3. pH 7
4. pH 8
The diagram shows a more elaborate and more accurate way of doing a neutralisation reaction using a conical flask, pipette and burette.
Given the general word equation for neutralisation: acid + alkali ==> salt + water
What pH value would the water have on its own? [7e-40]
1. pH 5
2. pH 8
3. pH 6
4. pH 7
A lake is found to be too acidic to allow fish to live. Which substance could be added to the water reduce the acidity in the lake? [7e-41]
1. quicklime
2. sodium hydroxide
3. artificial fertiliser
4. charcoal
Soil is found to be too acidic to allow healthy flower growth. Which substance could be added to reduce the acidity in the soil? [7e-42]
1. sodium hydroxide
2. slaked lime
3. phosphate-potassium fertiliser
4. charcoal
Which of the following 'fizzes' when acid is added to it? [7e-43]
1. cooking salt
2. potato chips
3. bicarbonate of soda
4. household ammonia
Which of the following 'fizzes' when acid is added to it? [7e-44]
1. cooking salt
2. potato chips
3. household ammonia
4. baking powder
Which statement about acids or alkalis is TRUE? [7e-45]
1. spilled acids and alkalis are made safer by diluting with water
2. acids are not safe enough to be used in food preparations
3. aspirin is a weak alkali
4. antacids in indigestion mixtures are weak acids
Which statement about acids or alkalis is TRUE? [7e-46]
1. spilled acids and alkalis are not made safer by diluting with water
2. acids are safe enough to be used in food preparations but they are sour tasting
3. aspirin is a weak alkali
4. antacids in indigestion mixtures are weak acids
Which statement about acids or alkalis is TRUE? [7e-47]
1. spilled acids and alkalis are not made safer by diluting with water
2. acids are not safe enough to be used in food preparations because they are too sour tasting
3. aspirin is a weak acid
4. antacids in indigestion mixtures are weak acids
Which statement about acids or alkalis is TRUE? [7e-48]
1. spilled acids and alkalis are not made safer by diluting with water
2. acids are not safe enough to be used in food preparations because they are too sour tasting
3. aspirin is a weak alkali
4. antacids in indigestion mixtures are weak alkalis
Which statement about acids or alkalis is TRUE? [7e-49]
1. orange juice is a weakly acid solution
2. toothpaste can be weakly acidic to remove plaque
3. oven spray cleaners can be a strongly acidic
4. vinegar is a harmless weak alkali
Which statement about acids or alkalis is TRUE? [7e-50]
1. orange juice is a weak alkali
2. toothpaste can be weakly alkaline to neutralise plaque acid
3. oven spray cleaners can be a strongly acidic
4. vinegar is a harmless weak alkali
Which statement about acids or alkalis is TRUE? [7e-51]
1. orange juice is a strongly acid solution
2. toothpaste can be weakly acid to neutralise plaque
3. oven spray cleaners can be moderately alkaline
4. vinegar is a harmless weak alkali
Which statement about acids or alkalis is TRUE? [7e-52]
1. orange juice is a strongly acid solution
2. toothpaste can be weakly acid to neutralise plaque
3. oven spray cleaners can be a strongly acid
4. vinegar is a harmless weak acid
Which statement is most likely to be TRUE? [7e-53]
1. sulphuric acid is a harmful acid
2. vinegar is a very corrosive acid
3. sodium hydroxide is a safe alkali
4. sodium bicarbonate is a strong harmful alkali
Which statement is most likely to be TRUE? [7e-54]
1. sulphuric acid is a not a corrosive acid
2. vinegar is a relatively harmless acid
3. sodium hydroxide is a safe alkali
4. sodium bicarbonate is a strong harmful alkali
Which statement is most likely to be TRUE? [7e-55]
1. sulphuric acid is a not a corrosive acid
2. vinegar is a relatively harmless alkali
3. sodium hydroxide is a harmful strong alkali
4. sodium bicarbonate is a weak harmless acid
Which statement is most likely to be TRUE? [7e-56]
1. sulphuric acid is a not a corrosive acid
2. vinegar is a potentially harmful strong acid
3. sodium hydroxide is a harmless weak alkali
4. sodium bicarbonate is a weak harmless alkali
The graph lines show what happens to the pH of a solution, when acids and alkalis are mixed together. Which statement is TRUE? [7e-57]
1. the brown graph line shows the change in pH when alkali is added to an acid solution
2. the purple graph line shows that more acid than alkali is needed to complete a neutralisation
3. volume y shows the amount of acid needed to neutralise an alkaline solution
4. pH k corresponds to when an alkaline solution has been neutralised
The graph lines show what happens to the pH of a solution, when acids and alkalis are mixed together. Which statement is TRUE? [7e-58]
1. the brown graph line shows that more alkali than acid is needed to complete a neutralisation
2. the purple graph line shows the change in pH when acid is added to an alkaline solution
3. volume y shows the amount of acid needed to neutralise an alkaline solution
4. pH k corresponds to when an alkaline solution has been neutralised
The graph lines show what happens to the pH of a solution, when acids and alkalis are mixed together. Which statement is TRUE? [7e-59]
1. the brown graph line shows that more alkali than acid is needed to complete a neutralisation
2. the purple graph line shows that more acid than alkali is needed to complete a neutralisation
3. volume w shows the amount of acid needed to neutralise an alkaline solution
4. pH e corresponds to when an acid solution has been neutralised
The graph lines show what happens to the pH of a solution, when acids and alkalis are mixed together. Which statement is TRUE? [7e-60]
1. the brown graph line shows that more alkali than acid is needed to complete a neutralisation
2. the purple graph line shows that more acid than alkali is needed to complete neutralising
3. volume y shows the amount of acid needed to neutralise an alkaline solution
4. pH g corresponds to when an acid solution has been neutralised
Lemon juice is an acid and bleach is an alkali. Which statement is FALSE? [7e-61]
1. blue litmus stays blue in lemon juice
2. red litmus stays red in lemon juice
3. blue litmus stays blue in bleach
4. red litmus turns blue in bleach
Lemon juice is an acid and bleach is an alkali. Which statement is FALSE? [7e-62]
1. blue litmus turns red in lemon juice
2. red litmus turns blue in lemon juice
3. blue litmus stays blue in bleach
4. red litmus turns blue in bleach
Lemon juice is an acid and bleach is an alkali. Which statement is FALSE? [7e-63]
1. blue litmus turns red in lemon juice
2. red litmus stays red in lemon juice
3. blue litmus turns red in bleach
4. red litmus turns blue in bleach
Lemon juice is an acid and bleach is an alkali. Which statement is FALSE? [7e-64]
1. blue litmus turns red in lemon juice
2. red litmus stays red in lemon juice
3. blue litmus stays blue in bleach
4. red litmus stays red in bleach
Which is the strongest alkali? [7e-65]
1. bleach
2. baking soda
3. ammonia
4. toothpaste
Four different coloured substances were extracted from plant materials. The idea was too see if any of them could be used as pH indicators to see how acid or how alkaline a solution is. They were made into four solutions and tested with three solutions of pH 2, 7 and 11. From the results, which do you think would make the most useful indicator? [7e-66]
1. blue in pH 2, green in pH 7, green in pH 11
2. purple in pH 2, green in pH 7, orange in pH 11
3. red in pH 2, orange in pH 7, green in pH 11
4. red in pH 2, blue in pH 7, purple in pH 11
What do we call substances that change colour in acids or alkalis to tell us which solution is which? [7e-67]
1. filters
2. papers
3. indicators
4. charts
Complete the general word equation for neutralisation: acid + alkali ==> ???? [7e-68]
1. water
2. salt + carbon dioxide
3. salt
4. salt + water
Which word describes the reaction between an acid and an alkali? [7e-69]
1. neutralisation
2. condensation
3. oxidation
4. sedimentation
At an agricultural testing laboratory, four soil samples from a horticultural company were tested for their relative acidity or alkalinity by measuring their pH with a special calibrated pH meter. Quicklime is an alkaline solid agri-chemical used to control soil pH.

Which soil most likely needs quicklime to make it neutral for healthy plant growth? [7e-70]
1. soil pH 8
2. soil pH 5
3. soil pH 7
4. soil pH 9
At an agricultural testing laboratory, four soil samples from a horticultural company were tested for their relative acidity or alkalinity by measuring their pH with a special calibrated pH meter. Quicklime is an alkaline solid agri-chemical used to control soil pH.

Which soil is unlikely to need quicklime to make it neutral for healthy plant growth? [7e-71]
1. soil pH 3.2
2. soil pH 5.1
3. soil pH 6.8
4. soil pH 4.7
At an agricultural testing laboratory, four soil samples from a horticultural company were tested for their relative acidity or alkalinity by measuring their pH with a special calibrated pH meter. Quicklime is an alkaline solid agri-chemical used to control soil pH. Acidic peat can be added to make a soil less alkaline.

Which soil needs peat adding to it to make it more neutral for healthy plant growth? [7e-72]
1. soil pH 6
2. soil pH 5
3. soil pH 7
4. soil pH 9
At an agricultural testing laboratory, four soil samples from a horticultural company were tested for their relative acidity or alkalinity by measuring their pH with a special calibrated pH meter. Quicklime is an alkaline solid agri-chemical used to control soil pH.

Which soil needs the most quicklime to make it neutral for healthy plant growth? [7e-73]
1. soil pH 3
2. soil pH 5
3. soil pH 7
4. soil pH 9
Which of the following can be safely used to treat an alkaline wasp sting? [7e-74]
1. calomine lotion
2. lemonade
3. washing soda
4. common salt
Which of the following can be safely used to treat an acid bee sting? [7e-75]
1. limewater
2. wine
3. bicarbonate of soda
4. common salt
Which of the following is the safest to use to treat an acid nettle sting? [7e-76]
1. wine
2. limewater
3. washing soda
4. calomine lotion
A chemical company can accidently spill a substance into a local stream that feeds into a trout fishing river. Which of the following possible spilled chemicals would cause the most immediate harm to aquatic river life? [7e-77]
1. sulphuric acid for car batteries
2. sodium chloride salt for de-icing roads
3. potassium phosphate for fertilisers
4. sodium hydrogencarbonate for antacid indigestion tablets
A chemical company can accidently spill a substance into a local stream that feeds into a trout fishing river. Which of the following possible spilled chemicals would cause the most immediate harm to aquatic river life? [7e-78]
1. sodium chloride salt for de-icing roads
2. sodium hydroxide used to make soluble aspirin salts
3. potassium phosphate for fertilisers
4. sodium hydrogencarbonate for antacid indigestion tablets
Which of the following statements is completely TRUE? [7e-79]
1. Vinegar is alkaline and so preserves food
2. Cola fizzy drinks are weakly alkaline
3. Vitamin C is a safe weak acid
4. Washing up liquid is strongly alkaline but not harmful
Which of the following statements is completely TRUE? [7e-80]
1. Vinegar is alkaline and so preserves food
2. Cola fizzy drinks are weakly alkaline
3. Vitamin C is a safe strong acid
4. Washing up liquid is often weakly alkaline but not harmful
Which of the following statements is completely TRUE? [7e-81]
1. Vinegar is weakly acidic and preserves food
2. Cola fizzy drinks are weakly alkaline
3. Vitamin C is a safe strong acid
4. Washing up liquid is strongly alkaline but not harmful
Which of the following statements is completely TRUE? [7e-82]
1. Vinegar is strongly acidic and so preserves food
2. Cola fizzy drinks are weakly acidic but may harm teeth
3. Vitamin C is a safe strong acid
4. Washing up liquid is strongly alkaline but not harmful
Which of the following statements is TRUE about the dangers of acids and alkalis? [7e-83]
1. sodium hydroxide is a weak alkali and will not harm the skin
2. sulphuric acid is a weak acid and will not irritate the skin
3. hydrochloric acid is a strong acid but is found in the stomach
4. household bleaches made from sodium hydroxide and chlorine are not toxic
Which of the following statements is TRUE about the dangers of acids and alkalis? [7e-84]
1. hydrochloric acid is a weak acid and is found in fruit
2. household bleaches made from sodium hydroxide and chlorine are not toxic
3. sodium hydroxide is a weak alkali and will not harm the skin
4. sulphuric acid is a strong acid and will irritate the skin
Which of the following statements is TRUE about the dangers of acids and alkalis? [7e-85]
1. sodium hydroxide is a strong alkali and will harm the skin
2. household bleaches made from sodium hydroxide and chlorine are not harmful
3. hydrochloric acid is a weak acid and is found in fruit
4. sulphuric acid is a strong acid but will not harm the skin
Which of the following statements is TRUE about the dangers of acids and alkalis? [7e-86]
1. sodium hydroxide is a weak alkali and will not irritate the skin
2. household bleaches made from sodium hydroxide and chlorine are toxic
3. hydrochloric acid is a weak acid and is found in fruit
4. sulphuric acid is a strong acid but will not harm the skin
A student tested some solutions with universal indicator to see whether they were acid, alkaline or neutral. The resulting colours were as follows:
Solution U - violet : Solution V - orange : Solution W - green
Solution X - blue : Solution Y - red : Solution Z - yellow

Which solutions were neutral? [7e-87]
1. only solution Z
2. only solutions X and Y
3. only solution W
4. only solutions U and V
A student tested some solutions with universal indicator to see whether they were acid, alkaline or neutral. The resulting colours were as follows:
Solution U - violet : Solution V - orange : Solution W - green
Solution X - blue : Solution Y - red : Solution Z - yellow

Which solutions were acid? [7e-88]
1. only solution W
2. only solutions V and Y
3. only solution U
4. only solutions V, Y and Z
A student tested some solutions with universal indicator to see whether they were acid, alkaline or neutral. The resulting colours were as follows:
Solution U - violet : Solution V - orange : Solution W - green
Solution X - blue : Solution Y - red : Solution Z - yellow

Which solutions were alkaline? [7e-89]
1. only solutions U and X
2. only solutions V
3. only solution W
4. only solutions Y and Z
A student tested some solutions with universal indicator to see whether they were acid, alkaline or neutral. The resulting colours were as follows:
Solution U - violet : Solution V - orange : Solution W - green
Solution X - blue : Solution Y - red : Solution Z - yellow

Which solution is the most strongly acid? [7e-90]
1. solution U
2. only solution Y
3. solution Z
4. solution V
A student tested some solutions with universal indicator to see whether they were acid, alkaline or neutral. The resulting colours were as follows:
Solution U - violet : Solution V - orange : Solution W - green
Solution X - blue : Solution Y - red : Solution Z - yellow

Which solution is the most weakly acid? [7e-91]
1. solution U
2. solution Y
3. solution Z
4. solution V
Lakes can be too acidic from dissolved air pollutents like sulphur dioxide and cause a decline in fish populations. Alkaline lime can be added to the lake to help the situation. What type of reaction occurs between the lime and acid rain to affect the lake pH? [7e-92]
1. saturation
2. decomposition
3. condensation
4. neutralisation
The acid-alkaline properties of four versions of "DOC BROWN'S ANTI-STING LOTION" were being tested in the laboratory. Their pH's are listed below. Which would be described as the most acid? [7e-93]
1. lotion pH 5.4
2. lotion pH 6.9
3. lotion pH 7.9
4. lotion pH 10.5
The acid-alkaline properties of four versions of "DOC BROWN'S ANTI-STING LOTION" were being tested in the laboratory. Their pH's are listed below. Which would be described as nearly neutral? [7e-94]
1. lotion pH 5.4
2. lotion pH 6.9
3. lotion pH 7.9
4. lotion pH 10.5
The acid-alkaline properties of four versions of "DOC BROWN'S ANTI-STING LOTION" were being tested in the laboratory. Their pH's are listed below. Which would be the safest to use on an acid bee sting? [7e-95]
1. lotion pH 5.4
2. lotion pH 6.9
3. lotion pH 7.9
4. lotion pH 11.0
The acid-alkaline properties of four versions of "DOC BROWN'S ANTI-STING LOTION" were being tested in the laboratory. Their pH's are listed below. Which would be described as the most alkaline? [7e-96]
1. lotion pH 5.4
2. lotion pH 6.9
3. lotion pH 7.9
4. lotion pH 10.5
The acid-alkaline properties of four versions of "DOC BROWN'S ANTI-STING LOTION" were being tested in the laboratory. Their pH's are listed below. Which would be the safest and most effective to use on an alkaline wasp sting? [7e-97]
1. lotion pH 5.4
2. lotion pH 6.9
3. lotion pH 7.9
4. lotion pH 9.5
The pH's of four soils are listed below. Heather prefers an acidic soil for healthy growth. Which soil would be the best to grow heather in? [7e-98]
1. soil pH 6.9
2. soil pH 5.4
3. soil pH 7.9
4. soil pH 9.5
The pH's of four soils are listed below. Some varieties of the vegetable parsley prefer alkaline soil for healthy growth. Which soil would be the best to grow the parsley in? [7e-99]
1. soil pH 6.9
2. soil pH 5.4
3. soil pH 7.9
4. soil pH 7.1
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-100]
1. the pH of saliva is normally about 5 to 6
2. Jim's mouth fluids were slightly acid at the start of the experiment
3. there is no evidence that saliva can be mildly alkaline
4. eating cakes makes the mouth fluids more acid
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-101]
1. the pH of saliva is normally close to neutral
2. Jim's mouth fluids were slightly acid at the start of the experiment
3. there is no evidence that saliva can be mildly alkaline
4. eating cakes makes the mouth fluids weakly acid for many hours after eating
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-102]
1. the pH of saliva is normally weakly acid
2. Jim's mouth fluids were slightly alkaline at the start of the experiment
3. there is no evidence that saliva can be mildly alkaline
4. eating cakes makes the mouth fluids weakly acid for many hours after eating
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-103]
1. the pH of saliva is normally weakly acid
2. Jim's mouth fluids were slightly alkaline at the start of the experiment
3. there is evidence that saliva can be mildly alkaline
4. the toothpaste Jane used was neutral
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-104]
1. Jane's mouth fluids were slightly alkaline at the start of the experiment
2. there is no evidence that either Jim or Jane kept on eating a cake after 30 minutes
3. there is no evidence that saliva can be mildly alkaline
4. the toothpaste Jane used was mildly alkaline
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-105]
1. Jane's mouth fluids were slightly acid at the start of the experiment
2. there is no evidence that either Jim or Jane kept on eating a cake after 30 minutes
3. there is no evidence of a reaction between the toothpaste Jane used and her mouth fluids
4. there is no evidence that saliva can be mildly alkaline
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-106]
1. Jane's mouth fluids were slightly alkaline at the start of the experiment
2. there is evidence that Jim kept on eating a cake after 30 minutes
3. there is no evidence of a reaction between the toothpaste Jane used and her mouth fluids
4. there is no evidence that saliva can be mildly alkaline
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-107]
1. Jane's mouth fluids were slightly alkaline at the start of the experiment
2. there is no evidence that either Jane or Jim kept on eating a cake after 30 minutes
3. there is evidence that the toothpaste Jane used neutralised weak acids in her mouth fluids
4. there is no evidence that saliva can be mildly alkaline
The graph shows the results of an experiment to monitor the pH of mouth fluids when various foods are eaten. In this case, Jim and Jane were enjoying sweet cakes and eating one every five minutes from 10 minutes to 30 minutes of the experiment. The pH was still measured before they started eating and for 15 minutes after they were told to stop eating. The experiment lasted a total of 45 minutes and Jane brushed her teeth 5 minutes after eating her last cake.
What could you say is most likely TRUE based on the graph of results? [7e-108]
1. the pH of saliva is normally about 5 to 6
2. Jim's mouth fluids were slightly alkaline at the start of the experiment
3. the toothpaste Jane used was neutral
4. there is evidence that saliva can be mildly alkaline and neutralise weak acids in the mouth
DANGER - chemist at work!!!! Which word matches the following hazard warning description ... 'may make you ill if swallowed, breathed in or absobed through the skin'? [7e-109]
1. harmful
2. irritant
3. corrosive
4. toxic
DANGER - chemist at work!!!! Which word matches the following hazard warning description ... 'may cause reddening or blistering of the skin'? [7e-110]
1. harmful
2. irritant
3. corrosive
4. toxic
DANGER - chemist at work!!!! Which word matches the following hazard warning description ... 'attacks and destroys living tissue'? [7e-111]
1. harmful
2. irritant
3. corrosive
4. toxic
DANGER - chemist at work!!!! Which word matches the following hazard warning description ... 'may kill you if swallowed, breathed in or absobed through the skin'? [7e-112]
1. harmful
2. irritant
3. corrosive
4. toxic
Which gas is formed when a metal reacts with an acid? [7f-1]
1. hydrogen
2. oxygen
3. carbon dioxide
4. methane
Which gas is needed for any fuel to burn? [7f-2]
1. hydrogen
2. oxygen
3. carbon dioxide
4. methane
Which gas is formed when a carbonate reacts with acid? [7f-3]
1. hydrogen
2. oxygen
3. carbon dioxide
4. methane
Which gas is a naturally occuring fuel? [7f-4]
1. hydrogen
2. oxygen
3. carbon dioxide
4. methane
In a chemistry experiment, which word means what you start with? [7f-5]
1. reactant
2. product
3. equation
4. evaluation
In a chemistry experiment, which word means what you end up with? [7f-6]
1. reactant
2. product
3. equation
4. evaluation
In a chemistry experiment, which word represents the overall change? [7f-7]
1. reactant
2. product
3. equation
4. evaluation
In a chemistry preparation experiment, which word means how well it has gone? [7f-8]
1. reactant
2. product
3. equation
4. evaluation
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change has happened, and new substances have been formed? [7f-9]
1. the colour changes
2. no gas bubbles form
3. the mixture doesn't change temperature
4. a clear solution is formed
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change has happened, and new substances have been formed? [7f-10]
1. there is no colour change
2. gas bubbles form
3. the mixture doesn't change temperature
4. no precipitate forms (a solid forming out of mixing solutions)
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change has happened, and new substances have been formed? [7f-11]
1. there is no colour change
2. no gas bubbles form
3. the mixture changes temperature
4. a clear solution is formed
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change has happened, and new substances have been formed? [7f-12]
1. there is no colour change
2. no gas bubbles form
3. the temperature stays the same
4. a precipitate forms (a solid forming out of mixing solutions)
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change when an acid is mixed with an alkali with litmus paper in it? [7f-13]
1. there is a colour change
2. no gas bubbles form
3. the mixture does not change temperature
4. no precipitate forms (a solid forming out of mixing solutions)
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change when a suspected carbonate is added to an acid? [7f-14]
1. there is no colour change
2. gas bubbles form
3. the temperature stays the same
4. a clear solution is formed
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change when a fuel burns? [7f-15]
1. there is a coloured flame
2. no gas bubbles form
3. the mixture changes temperature
4. a clear solution is formed
A variety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. Which of the following is most likely to indicate a chemical change when carbon dioxide is passed into limewater? [7f-16]
1. there is no colour change
2. no gas bubbles form
3. the temperature stays the same
4. a precipitate forms (a solid forming out of mixing solutions)
Which of the following best describes what is formed when methane reacts with oxygen? [7f-17]
1. carbon dioxide + water
2. salt + hydrogen
3. salt + water + carbon dioxide
4. an oxide
Which of the following is formed when a metal reacts with an acid? [7f-18]
1. carbon dioxide + water
2. salt + hydrogen
3. salt + water + carbon dioxide
4. an oxide
Which of the following is formed when a carbonate reacts with an acid? [7f-19]
1. carbon dioxide + water
2. salt + hydrogen
3. salt + water + carbon dioxide
4. an oxide
Which of the following is always formed when an element reacts with oxygen? [7f-20]
1. carbon dioxide + water
2. salt + hydrogen
3. salt + water + carbon dioxide
4. an oxide
Which of the following is the test for carbon dioxide gas? [7f-21]
1. the gas is bubbled into limewater
2. a glowing wooden splint is placed in the gas
3. a lit wooden splint is placed in the gas
4. damp blue litmus is placed in the gas
Which of the following is the test for oxygen gas? [7f-22]
1. the gas is bubbled into limewater
2. a glowing wooden splint is placed in the gas
3. a lit wooden splint is placed in the gas
4. damp blue litmus is placed in the gas
Which of the following is the test for hydrogen gas? [7f-23]
1. the gas is bubbled into limewater
2. a glowing wooden splint is placed in the gas
3. a lit wooden splint is placed in the gas
4. damp blue litmus is placed in the gas
Which of the following is the test for chlorine gas? [7f-24]
1. the gas is bubbled into limewater
2. a glowing wooden splint is placed in the gas
3. a lit wooden splint is placed in the gas
4. damp blue litmus is placed in the gas
When substance W was added to an acid, a colourless gas was formed that gave a squeaky pop with a lit splint. W is most likely to be a? [7f-25]
1. metal
2. metal carbonate
3. metal oxide
4. metal hydroxide
When substance X was added to an acid, a colourless gas formed that turned limewater 'milky'. X is most likely to be a? [7f-26]
1. metal
2. metal carbonate
3. metal oxide
4. metal hydroxide
When substance Y was added to an acid, the resulting solution turned green with universal indicator, and no gas bubbles were seen. Y is most likely to be a? [7f-27]
1. metal
2. metal carbonate
3. metal oxide
4. non-metal carbonate
Which of the following shows no reaction with acid? [7f-28]
1. magnesium
2. magnesium carbonate
3. copper carbonate
4. copper
Which of the following reacts fast with acids to form hydrogen? [7f-29]
1. magnesium
2. magnesium carbonate
3. copper carbonate
4. copper
Which of the following reacts with acid to form carbon dioxide gas and a colourless solution? [7f-30]
1. magnesium
2. magnesium carbonate
3. copper carbonate
4. copper
Which of the following reacts with acid to form carbon dioxide gas and a blue solution? [7f-31]
1. magnesium
2. magnesium carbonate
3. copper carbonate
4. copper
Which of the following burns to form the acidic gas sulphur dioxide? [7f-32]
1. magnesium sulphate
2. sulphuric acid
3. sulphur trioxide
4. sulphur (sulfur)
Which is TRUE about chemical reaction changes? [7f-33]
1. new substances are always formed
2. the change is easily reversed
3. sometimes new substances are formed
4. there is rarely visible evidence of the change
Which is TRUE about chemical reaction changes? [7f-34]
1. new substances are sometimes formed
2. the change is not easily reversed
3. no new substances are formed
4. there is rarely visible evidence of the change
Which is TRUE about physical changes but not chemical changes? [7f-35]
1. new substances are sometimes formed
2. the change is not easily reversed
3. no new substances are formed
4. there is rarely visible evidence of the change
Which is TRUE about physical changes but not chemical changes? [7f-36]
1. new substances are sometimes formed
2. there is rarely visible evidence of the change
3. new substances are always formed
4. the change is easily reversed
Which of the following is a physical change and not a chemical change? [7f-37]
1. melting gold to cast a statue in a mold
2. shiny steel changing to brown rust powder
3. burning petrol to form liquid water and carbon dioxide gas
4. zinc dissolving in hydrochloric acid
Which of the following is a physical change and not a chemical change? [7f-38]
1. shiny steel changing to brown rust powder
2. cast iron solidifying from a blast furnace
3. burning petrol to form liquid water and carbon dioxide gas
4. zinc dissolving in hydrochloric acid
Which of the following is a physical change and not a chemical change? [7f-39]
1. mixing acid with alkali causes a temperature rise
2. burning wax to form liquid water and carbon dioxide gas
3. steam condensing from boiling water
4. zinc dissolving in hydrochloric acid
Which of the following is a physical change and not a chemical change? [7f-40]
1. mixing acid with alkali causes a temperature rise
2. burning wax to form liquid water and carbon dioxide gas
3. zinc dissolving in hydrochloric acid
4. salt crystals forming from evaporating sea water
Which of the following is a physical change and not a chemical change? [7f-41]
1. petrol evaporating from a garage floor
2. burning wax to form liquid water and carbon dioxide gas
3. zinc dissolving in hydrochloric acid
4. marble chips dissolving in acid
Which of the following is a physical change and not a chemical change? [7f-42]
1. heated green copper carbonate turns it black
2. whisky condensing in a distillery
3. zinc dissolving in hydrochloric acid
4. marble chips dissolving in acid
Which of the following is a physical change and not a chemical change? [7f-43]
1. heated green copper carbonate turns it black
2. magnesium dissolving in sulphuric acid
3. sugar dissolving in water
4. marble chips dissolving in acid
Which of the following is a physical change and not a chemical change? [7f-44]
1. heated green copper carbonate turns it black
2. magnesium dissolving in sulphuric acid
3. adding lemon juice to solid bicarbonate of soda
4. freezing banana skins in liquid nitrogen
Which of the following represents a chemical change and not a physical change? [7f-45]
1. mixing acid with alkali causes a temperature rise
2. casting iron from a blast furnace
3. distilling whisky from fermented barley
4. freezing animal tissue in liquid nitrogen
Which of the following represents a chemical change and not a physical change? [7f-46]
1. casting iron from a blast furnace
2. brown powder forming on iron gates
3. distilling whisky from fermented barley
4. freezing animal tissue in liquid nitrogen
Which of the following represents a chemical change and not a physical change? [7f-47]
1. petrol evaporating from the fuel tank
2. sugar dissolving in vinegar
3. burning wax in a candle
4. crystallising blue copper sulphate crystals from aheated solution
Which of the following represents a chemical change and not a physical change? [7f-48]
1. petrol evaporating from the fuel tank
2. sugar dissolving in vinegar
3. crystallising blue copper sulphate crystals from a heated solution
4. dissolving zinc in hydrochloric acid
Which of the following represents a chemical change and not a physical change? [7f-49]
1. dissolving marble chips in acid
2. condensing pure water from a distillation
3. melting brass to cast a door knob
4. boiling water to drive out dissolved gases
Which of the following represents a chemical change and not a physical change? [7f-50]
1. condensing pure water from a distillation
2. heating green copper carbonate makes a black powder
3. melting brass to cast a door knob
4. boiling water to drive out dissolved gases
Which of the following represents a chemical change and not a physical change? [7f-51]
1. water freezing into hexagonal crystals
2. basalt crystals forming from molten lava
3. dissolving bicarbonate of soda in lemon juice
4. lemonade fizzing when the bottle top is taken off
Which of the following represents a chemical change and not a physical change? [7f-52]
1. water freezing into hexagonal crystals
2. basalt crystals forming from molten lava
3. lemonade fizzing when the bottle top is taken off
4. magnesium fizzing in sulphuric acid
Which is TRUE about burning fossil fuels? [7f-53]
1. most fuels contain a high percentage of carbon
2. the fuel reacts with nitrogen
3. little heat energy is released
4. clean fuels burn with a yellow flame
Which is TRUE about burning fossil fuels? [7f-54]
1. most fuels contain a low percentage of carbon
2. the fuel reacts with oxygen
3. little heat energy is released
4. clean fuels burn with a yellow flame
Which is TRUE about burning fossil fuels? [7f-55]
1. most fuels contain a low percentage of carbon
2. the fuel reacts with nitrogen
3. much heat energy is released
4. clean fuels burn with a yellow flame
Which is TRUE about burning fossil fuels? [7f-56]
1. most fuels contain a low percentage of carbon
2. the fuel reacts with nitrogen
3. little heat energy is released
4. clean fuels burn with a pale blue flame
A variety of observations can indicate when a chemical reaction is happening to form new substances when chemicals are mixed. Which of the following is most likely to indicate a chemical change when a metal is added to an acid? [7f-57]
1. gas bubbles form
2. there is no coloured product
3. the mixture does not change temperature
4. a clear solution is formed
A variety of observations can indicate when a chemical reaction is happening to form new substances when chemicals are mixed. Which of the following is most likely to indicate a chemical change when an acid is mixed with an alkali? [7f-58]
1. there is no obvious colour change
2. the mixture changes temperature
3. no gas bubbles form
4. no precipitate forms (a solid forming out of mixing solutions)
A solution X was tested by a student in various ways with different materials. The following results were obtained.
(1) Solution X gave no colour change with red litmus, but blue litmus turned red.
(2) Solution X turned universal indicator solution from green to orange.
(3) Solution X produced a slow 'fizzing' reaction with a marble chip. The gas formed gave a milky white precipitate when bubbled into limewater.
(4) Solution X produced a moderate 'fizzing' reaction with a strip of magnesium metal. A test tube of the gas formed gave a squeaky pop with a lit splint.
(5) Solution X produced a moderate 'fizzing' reaction with a pinch of 'bicarbonate of soda' powder. The gas formed gave a milky white precipitate when bubbled into limewater.
What could the student deduce about solution X from the results? [7f-59]
1. it is a strong alkali
2. it forms carbon dioxide when reacting with a metal
3. it is a weak acid
4. it forms hydrogen when reacting with a carbonate
A solution X was tested by a student in various ways with different materials. The following results were obtained.
(1) Solution X gave no colour change with red litmus, but blue litmus turned red.
(2) Solution X turned universal indicator solution from green to orange.
(3) Solution X produced a slow 'fizzing' reaction with a marble chip. The gas formed gave a milky white precipitate when bubbled into limewater.
(4) Solution X produced a moderate 'fizzing' reaction with a strip of magnesium metal. A test tube of the gas formed gave a squeaky pop with a lit splint.
(5) Solution X produced a moderate 'fizzing' reaction with a pinch of 'bicarbonate of soda' powder. The gas formed gave a milky white precipitate when bubbled into limewater.
What could the student deduce about solution X from the results? [7f-60]
1. it forms carbon dioxide when reacting with a metal
2. it will not form salts with an alkali
3. it is a weak alkali
4. it forms hydrogen when reacting with a metal
A solution X was tested by a student in various ways with different materials. The following results were obtained.
(1) Solution X gave no colour change with red litmus, but blue litmus turned red.
(2) Solution X turned universal indicator solution from green to orange.
(3) Solution X produced a slow 'fizzing' reaction with a marble chip. The gas formed gave a milky white precipitate when bubbled into limewater.
(4) Solution X produced a moderate 'fizzing' reaction with a strip of magnesium metal. A test tube of the gas formed gave a squeaky pop with a lit splint.
(5) Solution X produced a moderate 'fizzing' reaction with a pinch of 'bicarbonate of soda' powder. The gas formed gave a milky white precipitate when bubbled into limewater.
What could the student deduce about solution X from the results? [ 7f-61]
1. it forms carbon dioxide when reacting with a carbonate
2. it will not form salts with an alkali
3. it is a weak alkali
4. it forms carbon dioxide when reacting with a metal
A solution X was tested by a student in various ways with different materials. The following results were obtained.
(1) Solution X gave no colour change with red litmus, but blue litmus turned red.
(2) Solution X turned universal indicator solution from green to orange.
(3) Solution X produced a slow 'fizzing' reaction with a marble chip. The gas formed gave a milky white precipitate when bubbled into limewater.
(4) Solution X produced a moderate 'fizzing' reaction with a strip of magnesium metal. A test tube of the gas formed gave a squeaky pop with a lit splint.
(5) Solution X produced a moderate 'fizzing' reaction with a pinch of 'bicarbonate of soda' powder. The gas formed gave a milky white precipitate when bubbled into limewater.
What could the student deduce about solution X from the results? [7f-62]
1. it forms carbon dioxide when reacting with a metal
2. it will form salts with an alkali
3. it is a weak alkali
4. it forms hydrogen when reacting with a carbonate
A solution X was tested by a student in various ways with different materials. The following results were obtained.
(1) Solution X gave no colour change with red litmus, but blue litmus turned red.
(2) Solution X turned universal indicator solution from green to orange.
(3) Solution X produced a slow 'fizzing' reaction with a marble chip. The gas formed gave a milky white precipitate when bubbled into limewater.
(4) Solution X produced a moderate 'fizzing' reaction with a strip of magnesium metal. A test tube of the gas formed gave a squeaky pop with a lit splint.
(5) Solution X produced a moderate 'fizzing' reaction with a pinch of 'bicarbonate of soda' powder. The gas formed gave a milky white precipitate when bubbled into limewater.
What could the student deduce about solution X from the results? [7f-63]
1. it forms carbon dioxide when reacting with a metal
2. it will not form salts with an alkali
3. marble chips must be made of a carbonate
4. it forms hydrogen when reacting with a carbonate
Which of the following does NOT indicate a chemical change is happening when a candle burns? [7f-64]
1. light is given out from the flame
2. heat is given out by the flame
3. the candle goes out within a minute if a beaker is placed over it.
4. the heat from the flame melts the wax
The diagram shows a particular way of preparing a substance. How can you tell the method is for preparing a gaseous product? [7f-65]
1. bubbles are forming and collected
2. there is no filter funnel and paper to remove unreacted solid
3. the gas is not soluble in water
4. acids always produce gases when they react with a solid
The diagram shows a particular way of preparing a gaseous substance.
What does this method of preparation tell you about the gas being prepared? [7f-66]
1. it does not react with acids
2. it does not dissolve in water
3. it is not an alkali
4. it readily dissolves in water
Which of the following is only a physical change? [7f-67]
1. marble chips fizz with acid
2. magnesium burns brightly when heated in air
3. when zinc oxide is heated it turns yellow, on cooling it becomes white
4. heating green copper carbonate powder turns it black
The diagram shows an experiment to investigate the products of burning a hydrocarbon molecule like candle wax. What are the condensed colourless drops formed called? [7f-68]
1. carbon dioxide
2. oxygen
3. methane
4. water
The diagram shows an experiment to investigate the products of burning a hydrocarbon molecule like candle wax. If limewater is in the left-hand U, what is formed that causes the milky white precipitate? [7f-69]
1. carbon dioxide
2. condensed wax vapour
3. methane
4. water
Which of the following could be described as a reversible change? [7f-70]
1. marble chips fizz with acid
2. when zinc oxide is heated it turns yellow, on cooling it becomes white
3. magnesium burns brightly when heated in air
4. heating green copper carbonate powder turns it black
Chemical changes make new materials and tend not to be readily reversed. Physical changes do not make new materials and tend to be readily reversed. Which of the following is a chemical change? [7f-71]
1. the evaporation of a rain puddle
2. ice cracking a milk bottle
3. frying an egg
4. melting butter
Chemical changes make new materials and tend not to be readily reversed. Physical changes do not make new materials and tend to be readily reversed. Which of the following is a chemical change? [7f-72]
1. condensation forming on a window
2. ice cracking a milk bottle
3. melting butter
4. igniting a gas fire
Chemical changes make new materials and tend not to be readily reversed. Physical changes do not make new materials and tend to be readily reversed. Which of the following is a chemical change? [7f-73]
1. baking pottery clay in a kiln
2. ice cracking a milk bottle
3. melting butter
4. the evaporation of a rain puddle
Chemical changes make new materials and tend not to be readily reversed. Physical changes do not make new materials and tend to be readily reversed. Which of the following is a physical change? [7f-74]
1. baking pottery clay in a kiln
2. ice cracking a milk bottle
3. treating a bee sting
4. milk turning sour
Chemical changes make new materials and tend not to be readily reversed. Physical changes do not make new materials and tend to be readily reversed. Which of the following is a physical change? [7f-75]
1. baking pottery clay in a kiln
2. treating a wasp sting
3. melting butter
4. milk turning sour
Chemical changes make new materials and tend not to be readily reversed. Physical changes do not make new materials and tend to be readily reversed. Which of the following is a physical change? [7f-75]
1. baking pottery clay in a kiln
2. treating a wasp sting
3. wood rotting
4. condensation forming on windows
The diagram shows the test for carbon dioxide gas. What liquid is the gas bubbled into? [7f-77]
1. limewater
2. hydrochloric acid
3. carbonated water
4. universal indicator
Some antacid indigestion tablets contain carbonates such as sodium hydrogencarbonate. Which of the following is a simple test to see if a tablet contains a carbonate? [7f-78]
1. mix with universal indicator solution and see if it turns blue or purple
2. add a little acid, collect any gas formed and test it with limewater
3. add a little acid, collect any gas formed and test it with a lit splint
4. test the tablet with damp red litmus and see if it turns blue
Sometimes mineral ore sample can contain bits of free metal eg iron. Which of the following is a simple test to see if a rock contains bits of a metal? [7f-79]
1. mix with universal indicator solution and see if it turns green
2. add a little acid, collect any gas formed and test it with limewater
3. add a little acid, collect any gas formed and test it with a lit splint
4. test the resulting solution with red litmus and see if it turns purple
Which statement is TRUE when the yellow solid sulphur is heated in air and then burns to form a colourless gas? [7f-80]
1. it is a physical change
2. the change is easily reversed
3. the product is called sulphuric acid
4. the product is called sulphur dioxide
Which statement is TRUE when the yellow solid sulphur is heated in air and then burns to form a colourless gas? [7f-81]
1. it is a chemical change
2. the change is easily reversed
3. the reaction takes in heat energy
4. the product is called sulphuric acid
Which statement is TRUE when the yellow solid sulphur is heated in air and then burns to form a colourless gas? [7f-82]
1. it is a physical change
2. the change is not easily reversed
3. the reaction takes in heat energy
4. the product is called sulphuric oxide
Which statement is TRUE when the yellow solid sulphur is heated in air and then burns to form a colourless gas? [7f-83]
1. it is a physical change
2. the change is easily reversed
3. the reaction gives out heat energy
4. the product is called sulphuric oxide
The diagram shows a simple candle burning experiment and a graph of the results. What was the volume of the beaker that probably gave the least accurate result? [7f-84]
1. 100 cm³
2. 400 cm³
3. 800 cm³
4. 200 cm³
The diagram shows a simple candle burning experiment and a graph of the results. What volume of beaker would probably allow the candle to burn for 40 seconds? [7f-85]
1. 500 cm³
2. 450 cm³
3. 550 cm³
4. 350 cm³
The diagram shows a simple candle burning experiment and a graph of the results. What would be a reasonable estimate of the candle burning time if a 1500 cm³ beaker was used in the experiment? [7f-86]
1. 110 seconds
2. 120 seconds
3. 130 seconds
4. 140 seconds
The diagram shows a simple candle burning experiment and a graph of the results. during the experiment, what change happens to the gases in the beaker? [7f-87]
1. the oxygen decreases and the carbon dioxide decreases
2. the oxygen increases and the carbon dioxide increases
3. the oxygen decreases and the carbon dioxide increases
4. the oxygen increases and the carbon dioxide decreases
When water is added to baking powder the mixture steadily 'bubbles'. Which of the following is most likely to account for such an observation? [7f-88]
1. water is decomposed by the powder
2. trapped air in the powder is released
3. baking powder contains an acid and a metal that react together
4. baking powder contains an acid and a carbonate that react together

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KS3 Science-Chemistry Quiz on "Acids, alkalis, salts and simple chemical reactions" (based on QCA 7E & 7F)

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