KS3 Science-Chemistry Quiz on "Atoms, elements, compounds and mixtures" (based on QCA 8E & 8F)

Which word means the 'smallest particle of a substance'? [8e-1]
1. atom
2. molecule
3. symbol
4. formula
Which word means 'a larger particle formed by bonding together the smallest particles of substances'? [8e-2]
1. atom
2. molecule
3. symbol
4. formula
Which word means the 'shorthand for a chemical element'? [8e-3]
1. atom
2. molecule
3. symbol
4. formula
Which word means 'a summary of the number of atoms of each element in a compound'? [8e-4]
1. atom
2. molecule
3. symbol
4. formula
Which of these is an element? [8e-5]
1. Cu
2. CO
3. MgO
4. H₂O
Which of these is an element? [8e-6]
1. CoO
2. Mg
3. CO₂
4. NaCl
Which of these is an element? [8e-7]
1. CoO
2. MgS
3. O₂
4. NaCl
Which of these is an element? [8e-8]
1. KCl
2. MgS
3. F₂O
4. P₄
Which of these is a compound? [8e-9]
1. CO₂
2. Co
3. F₂
4. P₄
Which of these is a compound? [8e-10]
1. Co
2. MgO
3. F₂
4. P₄
Which of these is a compound? [8e-11]
1. Fe
2. Co
3. CO
4. H₂
Which of these is a compound? [8e-12]
1. Fe
2. Co
3. Ca
4. H₂O
Which of these is an element? [8e-13]
1. nitrogen
2. carbon monoxide
3. water
4. petrol
Which of these is an element? [8e-14]
1. nitrogen monoxide
2. magnesium
3. water
4. alcohol
Which of these is an element? [8e-15]
1. water
2. magnesium oxide
3. bromine
4. alcohol
Which of these is an element? [8e-16]
1. water
2. magnesium oxide
3. brass
4. copper
Which of these is a compound? [8e-17]
1. carbon monoxide
2. magnesium
3. brass
4. bromine
Which of these is a compound? [8e-18]
1. carbon
2. water
3. copper
4. bromine
Which of these is a compound? [8e-19]
1. carbon
2. phosphorus
3. copper oxide
4. bromine
Which of these is a compound? [8e-20]
1. brass (alloy)
2. phosphorus (red)
3. copper (roofing)
4. ethanol (alcohol)
Which of these words means 'one type of atom only'? [8e-21]
1. element
2. compound
3. reactant
4. product
Which word means 'two or more types of atom combined together'? [8e-22]
1. element
2. compound
3. reactant
4. product
Which word means 'what you start with in a chemical reaction'? [8e-23]
1. element
2. compound
3. reactant
4. product
Which word means 'the result of a chemical reaction'? [8e-24]
1. element
2. compound
3. reactant
4. product
Which is the chemical symbol for carbon? [8e-25]
1. C
2. Ca
3. Cr
4. Co
Which is the chemical symbol for calcium? [8e-26]
1. C
2. Ca
3. Cu
4. Co
Which is the chemical symbol for copper? [8e-27]
1. CO
2. Ca
3. Cu
4. Co
Which is the chemical symbol for cobalt? [8e-28]
1. CO
2. Ca
3. Cu
4. Co
Which picture represents a mixture of two compound molecules? [8e-29]
Which picture represents molecules of a pure element? [8e-30]
Which picture represents a mixture of molecules of two elements? [8e-31]
Which picture represents a molecule mixture of two elements and one compound? [8e-32]
Which picture represents a mixture of atoms of an element and molecules of a compound? [8e-33]
Which picture represents atoms of a pure element? [8e-34]
Which picture represents a mixture of atoms of an element and molecules of another element? [8e-35]
Which picture represents molecules of a pure compound? [8e-36]
Which picture represents a mixture of atoms of two elements? [8e-37]
Which picture represents a mixture of molecules of an element and molecules of a compound? [8e-38]
Which picture best represents pure water? [8e-39]
Which picture best represents oxygen dissolved in pure water? [8e-40]
Which is likely to consist of one element? [8e-41]
1. gold ring
2. duralumin hi fi chassis
3. bronze statue
4. pure quartz crystal
Which is likely to consist of one element? [8e-42]
1. duralumin hi fi chassis
2. aluminium pan
3. bronze statue
4. pure quartz crystal
Which is likely to consist of one element? [8e-43]
1. duralumin hi fi chassis
2. bronze statue
3. yellow rock sulphur
4. pure quartz crystal
Which is likely to consist of one element? [8e-44]
1. brass rivet
2. bronze statue
3. pure quartz crystal
4. silver plate
Which statement is TRUE ? [8e-45]
1. most elements are metals
2. most metals are magnetic
3. there are about 1000 different elements in the Periodic Table
4. there are no liquid elements at room temperature and pressure
Which statement is TRUE ? [8e-46]
1. most elements are non-metals
2. most metals are non-magnetic
3. there are about 1000 different elements in the Periodic Table
4. there are no liquid elements at room temperature and pressure
Which statement is TRUE ? [8e-47]
1. most elements are non-metals
2. most metals are magnetic
3. there are about 100 different elements in the Periodic Table
4. there are no liquid elements at room temperature and pressure
Which statement is TRUE ? [8e-48]
1. most elements are non-metals
2. most metals are magnetic
3. there are about 1000 different elements in the Periodic Table
4. there are a few liquid elements at room temperature and pressure
Which element is a liquid metal at room temperature and pressure? [8e-49]
1. mercury
2. bromine
3. phosphorus
4. nickel
Which element is a liquid non-metal at room temperature and pressure? [8e-50]
1. mercury
2. bromine
3. oxygen
4. nickel
Which element of the Periodic Table is a colourless non-metal gas? [8e-51]
1. mercury
2. bromine
3. nitrogen
4. nickel
Which element of the Periodic Table is a solid magnetic metal? [8e-52]
1. mercury
2. bromine
3. sulphur
4. nickel
The product of burning magnesium in air is? [8e-53]
1. magnesium oxide
2. oxygen magneside
3. magnesium hydroxide
4. milk of magnesia
The product of heating an iron-sulphur mixture is called? [8e-54]
1. iron sulphate
2. iron sulphide
3. sulphuric iron
4. sulphide of iron
The product of heating sodium in chlorine is called? [8e-55]
1. sodium chlorate
2. chloro sodium
3. sodium chloride
4. chloric sodiumate
The product of burning hydrogen in air is? [8e-56]
1. oxohydrogen
2. hydrogen peroxide
3. hydrogen hydroxide
4. water
What is formed when carbon burns in excess air? [8e-57]
1. carbon dioxide
2. carbon oxide
3. carbon monoxide
4. oxygen carbonate
What is formed when silvery zinc is heated in green chlorine gas? [8e-58]
1. zinc chlorate
2. zinc chloride
3. chlorozincate
4. chloride of zinc
What is formed after heating a sulphur-copper mixture? [8e-59]
1. copper sulphate
2. sulphonium cuprate
3. copper sulphide
4. sulphate of copper
When copper is heated in a bunsen flame it forms a black solid.
What is the name of the compound formed? [8e-60]
1. copper nitride
2. copper hydroxide
3. copper carbide
4. copper oxide
The formula for sulphuric acid is H₂SO₄.
What is the ratio of H : S : O atoms in the molecule? [8e-61]
1. 2 : 1 : 4
2. 1 : 2 : 4
3. 2 : 4 : 4
4. 2 : 2 : 4
The formula for calcium carbonate is CaCO₃.
What is the ratio of Ca : C : O atoms in the formula? [8e-62]
1. 1 : 3 : 3
2. 1 : 1 : 3
3. 3 : 3 : 1
4. 3 : 1 : 1
The formula for sodium sulphate is Na₂S₂O₃.
What is the ratio of Na : S : O atoms in the formula? [8e-63]
1. 3 : 2 : 2
2. 3 : 3 : 2
3. 2 : 2 : 3
4. 2 : 3 : 3
The formula for copper sulphate is CuSO₄.
What is the ratio of Cu : S : O atoms in the formula? [8e-64]
1. 1 : 4 : 4
2. 4 : 4 : 4
3. 4 : 3 : 4
4. 1 : 1 : 4
Which of the following reactions involves the chemical change ...
two elements ==> compound? [8e-65]
1. zinc + sulphur ==> zinc sulphide
2. oxygen + copper sulphide ==> copper sulphate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following reactions involves the chemical change ...
element + compound ==> compound? [8e-66]
1. zinc + sulphur ==> zinc sulphide
2. oxygen + copper sulphide ==> copper sulphate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following reactions involves the chemical change ...
two compounds ==> two compounds? [8e-67]
1. zinc + sulphur ==> zinc sulphide
2. oxygen + copper sulphide ==> copper sulphate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following reactions involves the chemical change ...
compound ==> two elements? [8e-68]
1. zinc + sulphur ==> zinc sulphide
2. oxygen + copper sulphide ==> copper sulphate
3. carbon dioxide + calcium hydroxide ==> calcium carbonate + water
4. water ==> hydrogen + oxygen
Which of the following is the chemical symbol for the element potassium? [8e-69]
1. K
2. Pt
3. Po
4. P
Which of the following is the chemical symbol for the element nitrogen? [8e-70]
1. No
2. N
3. Ne
4. Ni
Which of the following is the chemical symbol for the element magnesium? [8e-71]
1. Mn
2. Mo
3. Mg
4. Md
Which of the following is the chemical symbol for the element aluminium? [8e-72]
1. Am
2. Ar
3. As
4. Al
Which element is a solid magnetic metal at room temperature? [8e-73]
1. iron
2. sulphur
3. mercury
4. oxygen
Which element is a yellow solid non-metal room temperature? [8e-74]
1. iron
2. sulphur
3. mercury
4. oxygen
Which element is the only liquid metal at room temperature? [8e-75]
1. iron
2. sulphur
3. mercury
4. oxygen
Which element is a colourless gaseous non-metal at room temperature? [8e-76]
1. iron
2. sulphur
3. mercury
4. oxygen
Which element is a green non-metal gas? [8e-77]
1. chlorine
2. aluminium
3. bromine
4. sodium
Which element is a silvery grey solid metal? [8e-78]
1. chlorine
2. aluminium
3. bromine
4. sodium
Which element is a dark red liquid non-metal at room temperature? [8e-79]
1. chlorine
2. aluminium
3. bromine
4. sodium
Which element is a very soft silvery solid metal at room temperature? [8e-80]
1. chlorine
2. aluminium
3. bromine
4. sodium
Which statement is USUALLY TRUE when comparing the physical properties of metallic and non-metallic elements? [8e-81]
1. metals are good conductors of heat
2. metals have low melting and boiling points
3. non-metals are good conductors of electricity
4. non-metals have high densities
Which statement is USUALLY TRUE when comparing the physical properties of metallic and non-metallic elements? [8e-82]
1. metals are poor conductors of heat
2. metals have high melting and boiling points
3. non-metals are good conductors of electricity
4. non-metals have high densities
Which statement is USUALLY TRUE when comparing the physical properties of metallic and non-metallic elements? [8e-83]
1. metals are poor conductors of heat
2. metals have low melting and boiling points
3. non-metals are poor conductors of electricity
4. non-metals have high densities
Which statement is USUALLY TRUE when comparing the physical properties of metallic and non-metallic elements? [8e-84]
1. metals are poor conductors of heat
2. metals have low melting and boiling points
3. non-metals are good conductors of electricity
4. non-metals have low densities
Which statement is USUALLY TRUE when comparing the physical properties of metallic and non-metallic elements? [8e-85]
1. metals are good conductors of electricity
2. metals have low densities
3. non-metals are good conductors of heat
4. non-metals have high melting and boiling points
Which statement is USUALLY TRUE when comparing the physical properties of metallic and non-metallic elements? [8e-86]
1. metals are poor conductors of electricity
2. metals have high densities
3. non-metals are good conductors of heat
4. non-metals have high melting and boiling points
Which statement is USUALLY TRUE about metallic and non-metallic elements? [8e-87]
1. metals are poor conductors of electricity
2. metals have low densities
3. non-metals are poor conductors of heat
4. non-metals have high melting and boiling points
Which statement is USUALLY TRUE about metallic and non-metallic elements? [8e-88]
1. metals are poor conductors of electricity
2. metals have low densities
3. non-metals are good conductors of heat
4. non-metals have low melting and boiling points
Which is the chemical symbol for the element iron? [8e-89]
1. Fe
2. F
3. Ir
4. I
Which is the chemical symbol for the element zinc? [8e-90]
1. ZnO
2. Zn
3. ZnS
4. ZrC
Which is the chemical symbol for the element chlorine? [8e-91]
1. Co
2. Cr
3. Cl
4. Ce
Which is the chemical symbol for the element sodium? [8e-92]
1. S
2. Sm
3. Sn
4. Na
Which statement is TRUE about the Periodic Table of Elements? [8e-93]
1. metals are mostly on the left and in the middle
2. all non-metals are in the middle
3. there are about 1000 different elements
4. about 1/2 of the elements are metals
Which statement is TRUE about the Periodic Table of Elements? [8e-94]
1. metals are mostly in the middle and on the right
2. all non-metals are on the right
3. there are about 500 different elements
4. about 1/4 of the elements are metals
Which statement is TRUE about the Periodic Table of Elements? [8e-95]
1. metals are mostly in the middle and on the right
2. all non-metals are on the left
3. about 1/4 are non-metals
4. about 1/2 of the elements are metals
Which statement is TRUE about the Periodic Table of Elements? [8e-96]
1. metals are mostly in the middle and on the right
2. all non-metals are in the middle
3. there are about 50 different non-metals
4. about 3/4 of the elements are metals
Which statement is TRUE about the elements of the Periodic Table of Elements at room temperature? [8e-97]
1. almost all metals are silvery shiny solids
2. most non-metallic elements are dull solids
3. most metals like aluminium and copper are magnetic
4. it is impossible for a non-metal to be magnetic
Which statement is TRUE about the elements of the Periodic Table of Elements at room temperature? [8e-98]
1. only a few metals like aluminium and silver are silvery shiny solids
2. there are only a few non-metallic elements which are dull solids
3. most metals like aluminium and copper are magnetic
4. it is impossible for a non-metal to be magnetic
Which statement is TRUE about the elements of the Periodic Table of Elements at room temperature? [8e-99]
1. only a few metals like aluminium and silver are silvery shiny solids
2. most non-metallic elements are dull solids
3. a few metals like iron and nickel are magnetic
4. it is impossible for a non-metal to be magnetic
Which statement is TRUE about the elements of the Periodic Table of Elements at room temperature? [8e-100]
1. only a few metals like aluminium and silver are silvery shiny solids
2. most non-metallic elements are dull solids
3. most metals like aluminium and copper are magnetic
4. it is possible for a non-metal to be magnetic
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-1]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has a fixed melting point? true or false? true or false? true or false?
1. true, true, false
2. true, false, false
3. false, false, true
4. false, true, true
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-2]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has only one type of atom? true or false? true or false? true or false?
1. true, true, false
2. true, false, false
3. false, false, true
4. false, true, true
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-3]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
always has the same composition? true or false? true or false? true or false?
1. false, true, true
2. true, false, false
3. true, true, false
4. false, false, true
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-4]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has a definite chemical symbol or formula? true or false? true or false? true or false?
1. false, false, true
2. true, false, true
3. false, true, false
4. true, true, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-5]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has no fixed boiling point? true or false? true or false? true or false?
1. false, false, true
2. true, false, true
3. false, true, false
4. true, true, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-6]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
is easily separated into different substances? true or false? true or false? true or false?
1. false, true, true
2. false, false, true
3. true, true, false
4. true, false, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-7]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
has more than one type of atom? true or false? true or false? true or false?
1. true, true, false
2. false, false, true
3. false, true, true
4. true, false, false
Given the STATEMENT about ...., decide whether it is TRUE or FALSE for an ELEMENT, COMPOUND or MIXTURE [8f-8]
STATEMENT about .... ELEMENT COMPOUND MIXTURE
there are only about 100 of them? true or false? true or false? true or false?
1. true, true, false
2. false, false, true
3. false, true, true
4. true, false, false
/What is the formula of the molecule? [8f-9]
1. C₂H₆O
2. ₂C₆HO
3. C₃H₆
4. C₆H₂O
What is the formula of the molecule? [8f-10]
1. C₅H₆I₂
2. C₃H₆Cl₂
3. C₆H₃Cl₂
4. C₂H₆Cl₃
What is the formula of the molecule? [8f-11]
1. C₈H₃
2. ₃C₈H
3. C₃H₈
4. C₃H₆
What is the formula of the molecule? [8f-12]
1. C₂H₆O₃
2. ₃C₆H₂O
3. C₅H₆O
4. C₃H₆O₂
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-13]
1. the boiling point is higher than pure water
2. the freezing point is higher than pure water
3. the boiling point decreases the longer the solution is boiled
4. the solution becomes less concentrated the longer it is boiled
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-14]
1. the boiling point is lower than pure water
2. the freezing point is lower than pure water
3. the boiling point decreases the longer the solution is boiled
4. the solution becomes less concentrated the longer it is boiled
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-15]
1. the boiling point is lower than pure water
2. the freezing point is higher than pure water
3. the boiling point increases the longer the solution is boiled
4. the solution becomes less concentrated the longer it is boiled
When some salt is dissolved in plenty of water, which statement is most likely TRUE about the resulting solution? [8f-16]
1. the boiling point is lower than pure water
2. the freezing point is higher than pure water
3. the boiling point decreases the longer the solution is boiled
4. the solution becomes more concentrated the longer it is boiled
Which order of the three words matches the three substances iron, iron oxide, steel ?, ?, ? [8f-17]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances salt, sodium, seawater ?, ?, ? [8f-18]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances brass, copper oxide, zinc ?, ?, ? [8f-19]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances hydrogen, petrol, water ?, ?, ? [8f-20]
1. element, compound, mixture
2. compound, element, mixture
3. mixture, compound, element
4. element, mixture, compound
Which order of the three words matches the three substances carbon dioxide, coal, carbon ?, ?, ? [8f-21]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which order of the three words matches the three substances plaster of Paris, gypsum, flowers of sulphur ?, ?, ? [8f-22]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which order of the three words matches the three substances chlorine, rock salt, sodium chloride ?, ?, ? [8f-23]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which order of the three words matches the three substances sodium hydroxide, oxygen, bleach ?, ?, ? [8f-24]
1. compound, mixture, element
2. mixture, compound, element
3. element, mixture, compound
4. compound, element, mixture
Which two words apply to the substance nitrogen? [8f-25]
1. gas, element
2. liquid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance copper sulphate? [8f-26]
1. gas, element
2. solid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance wood? [8f-27]
1. gas, element
2. solid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance sulphur dioxide? [8f-28]
1. gas, element
2. solid, compound
3. solid, mixture
4. gas, compound
Which two words apply to the substance vinegar? [8f-29]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Which two words apply to the substance magnesium? [8f-30]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Which two words apply to the substance air? [8f-31]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Which two words apply to the substance mercury? [8f-32]
1. liquid, mixture
2. solid, element
3. gas, mixture
4. liquid, element
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-33]
1. at the start they are a mixture
2. at the end they are a mixture
3. at the start they cannot be separated with a magnet
4. at the end they can be separated with a magnet
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-34]
1. at the start they are a compound
2. at the end they are a compound
3. at the start they cannot be separated with a magnet
4. at the end they can be separated with a magnet
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-35]
1. at the start they are a compound
2. at the end they are a mixture
3. at the start they can be separated with a magnet
4. at the end they can be separated with a magnet
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-36]
1. at the start they are a compound
2. at the end they are a mixture
3. at the start they cannot be separated with a magnet
4. at the end they cannot be separated with a magnet
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-37]
1. the colour change suggests a chemical reaction has happened overall
2. FeS describes them at the start, Fe + S describes them at the end
3. at the start, acid will act on the iron forming hydrogen and the same gas is formed with acid and the dark-grey solid product
4. the red glow without heating shows overall a physical change has happened to the mixture when cool
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-38]
1. the colour change suggests a physical change has happened overall
2. Fe + S describes them at the start, FeS describes them at the end
3. at the start, acid will act on the iron forming hydrogen and the same gas is formed with acid and the dark-grey solid product
4. the red glow without heating shows overall a physical change has happened to the mixture when cool
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-39]
1. the colour change suggests a physical change has happened overall
2. FeS describes them at the start, Fe + S describes them at the end
3. at the start, acid will act on the iron forming hydrogen and hydrogen sulphide gas is formed with acid and the dark-grey solid product
4. the red glow without heating shows overall a physical change has happened to the mixture when cool
Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid. Which statement is TRUE about the contents of the test tube in the experiment? [8f-40]
1. the colour change suggests a physical change has happened overall
2. FeS describes them at the start, Fe + S describes them at the end
3. at the start, acid will act on the iron forming hydrogen and the same gas is formed with acid and the dark-grey solid product
4. the red glow without heating suggests overall a chemical change has happened to the mixture when cool
Which method of separation is best to use for separating petrol from crude oil? [8f-41]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for obtaining salt from seawater? [8f-42]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for removing silt from muddy water? [8f-43]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for investigating the composition of food dyes in sweet colours? [8f-44]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for purifying water containing small quantities of dissolved minerals? [8f-45]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for obtaining fertiliser crystals from neutralising nitric acid solution with the alkali ammonia? [8f-46]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for separating a solid product* formed from mixing two solutions? (* called a precipitate) [8f-47]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which method of separation is best to use for checking which ink was used in a forged cheque? [8f-48]
1. distillation
2. evaporation
3. filtration
4. chromatography
Which particle is a compound made up of three elements? [8f-49]
1. 8
2. 2
3. 4
4. 7
Which particle is a compound made up of three elements? [8f-50]
1. 2
2. 9
3. 4
4. 7
Which particle is an element made up of single atoms? [8f-51]
1. 1
2. 6
3. 3
4. 5
Which particle is a compound made up of two elements? [8f-52]
1. 3
2. 5
3. 6
4. 1
Which particle is a compound made up of two elements? [8f-53]
1. 7
2. 8
3. 6
4. 3
Which particle is a molecule made of 4 atoms? [8f-54]
1. 7
2. 6
3. 8
4. 2
Which particle is formed when two different colourless gases chemically combine? [8f-55]
1. 7
2. 6
3. 4
4. 2
Which particle is formed when a black solid and a colourless gas chemically combine? [8f-56]
1. 9
2. 6
3. 4
4. 2

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STATEMENT about ....	ELEMENT	COMPOUND	MIXTURE
has a fixed melting point?	true or false?	true or false?	true or false?

KS3 Science-Chemistry Quiz on "Atoms, elements, compounds and mixtures" (based on QCA 8E & 8F)

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