KS3 Science-Chemistry Quiz on "ACIDS and ALKALIS" (based on QCA 7E)

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 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

KS3 Science-Chemistry Quiz on "ACIDS and ALKALIS" (based on QCA 7E)

CLICK on [?] and read any feedback. EMAIL query?comment AND quote Q database number [7e-xx] 19-09-07