OCR GCSE 9-1 Twenty First Century Combined Science chemistry Suite BGCSE Combined Science QUIZ Chapter C3 "Chemicals of the natural environment" (Foundation Tier)

Which word corresponds to a hydrocarbon molecule? [op-13]
1. compound
2. element
3. fraction
4. mixture
Which word corresponds to carbon? [op-14]
1. compound
2. element
3. fraction
4. mixture
Which word corresponds to a narrow boiling range of hydrocarbons from oil? [op-15]
1. compound
2. element
3. fraction
4. condensate
Which word corresponds to crude oil? [op-16]
1. compound
2. element
3. fraction
4. mixture
Which word corresponds to methane gas? [op-17]
1. compound
2. element
3. fraction
4. mixture
Which word corresponds to hydrogen? [op-18]
1. compound
2. element
3. fraction
4. mixture
Which word corresponds to a range of similar sized hydrocarbons from oil? [op-19]
1. compound
2. element
3. fraction
4. crackate
Which word corresponds to a fraction of crude oil? [op-20]
1. compound
2. element
3. evaporate
4. mixture
Which word means changing a gas into liquid? [op-21]
1. condensing
2. cracking
3. distilling
4. evaporating
Which word means breaking up big molecules into small ones? [op-22]
1. condensing
2. cracking
3. distilling
4. evaporating
Which of the following involves liquid to gas AND gas to liquid without chemical change? [op-23]
1. condensing
2. cracking
3. distilling
4. evaporating
Which word means what happens to spilt petrol? [op-24]
1. condensing
2. cracking
3. distilling
4. evaporating
Which of the following is TRUE about crude oil? [op-45]
1. formed from the decayed remains of plants and animals
2. its a renewable energy resource
3. its an infinite energy resource
4. its a compound
Which of the following is TRUE about crude oil? [op-46]
1. formed from the erosion of sedimentary rock
2. its a non-renewable energy resource
3. its an infinite energy resource
4. its a compound
Which of the following is TRUE about crude oil? [op-47]
1. formed from the erosion of sedimentary rock
2. its a renewable energy resource
3. its a finite energy resource
4. its a compound
Which of the following is TRUE about crude oil? [op-48]
1. formed from the erosion of sedimentary rock
2. its a renewable energy resource
3. its an infinite energy resource
4. its a mixture of hydrocarbons
Which of the following is TRUE about crude oil? [op-49]
1. the mixture can separated by distillation
2. its a non-fossil fuel
3. the molecules are all the same size
4. the components have the same boiling point
Which of the following is TRUE about crude oil? [op-50]
1. the mixture can't be separated by distillation
2. its a fossil fuel
3. the molecules are all the same size
4. the components have the same boiling point
Which of the following is TRUE about crude oil? [op-51]
1. the mixture can't be separated by distillation
2. its a non-fossil fuel
3. the molecules are of different size
4. the components have the same boiling point
Which of the following is TRUE about crude oil? [op-52]
1. the mixture can't be separated by distillation
2. its a non-fossil fuel
3. the molecules are the same size
4. the components have the different boiling points
Which is TRUE as a hydrocarbon molecule gets bigger (more carbon atoms in chain)? [op-53]
1. the boiling point gets higher
2. it gets more volatile (more easily vaporised)
3. it gets less viscous (less sticky)
4. it gets more easy to ignite (gets more flammable)
Which is TRUE as a hydrocarbon molecule gets bigger (more carbon atoms in chain)? [op-54]
1. the boiling point gets lower
2. it gets less volatile (less easily vaporised)
3. it gets less viscous (less sticky)
4. it gets more easy to ignite (gets more flammable)
Which is TRUE as a hydrocarbon molecule gets bigger (more carbon atoms in chain)? [op-55]
1. the boiling point gets lower
2. it gets more volatile (more easily vaporised)
3. it gets more viscous (more sticky)
4. it gets more easy to ignite (gets more flammable)
Which is TRUE as a hydrocarbon molecule gets bigger (more carbon atoms in chain)? [op-56]
1. the boiling point gets lower
2. it gets more volatile (more easily vaporised)
3. it gets less viscous (less sticky)
4. it gets less easy to ignite (gets less flammable)
Cracking is an example of? [op-57]
1. thermal decomposition
2. polymerisation
3. fractional distillation
4. combustion
Making plastics is an example of? [op-58]
1. thermal decomposition
2. polymerisation
3. fractional distillation
4. combustion
The separation of crude oil products is an example of? [op-59]
1. thermal decomposition
2. polymerisation
3. fractional distillation
4. combustion
Burning a fuel is an example of? [op-60]
1. thermal decomposition
2. polymerisation
3. fractional distillation
4. combustion
Which TRUE about the process of 'cracking' in the petrochemical oil industry? [op-61]
1. it needs a high temperature
2. it doesn't need a catalyst
3. it makes small molecules into more useful bigger molecules
4. it can make plastics
Which TRUE about the process of 'cracking' in the petrochemical oil industry? [op-62]
1. it needs a low temperature
2. it needs a catalyst
3. it makes small molecules into more useful bigger molecules
4. it can make plastics
Which TRUE about the process of 'cracking' in the petrochemical oil industry? [op-63]
1. it needs a low temperature
2. it doesn't need a catalyst
3. it makes big molecules into more useful smaller molecules like petrol
4. it can make plastics
Which TRUE about the process of 'cracking' in the petrochemical oil industry? [op-64]
1. it needs a low temperature
2. it doesn't need a catalyst
3. it makes small molecules into more useful bigger molecules like petrol
4. it can make small molecules to convert into plastics
Which corresponds to a process that has been occuring over a very long period of geological time? [op-65]
1. process J
2. process N
3. process K
4. process M
Which corresponds to a process of combustion? [op-66]
1. process J
2. process N
3. process K
4. process M
Which corresponds to a process of fractional distillation? [op-67]
1. process J
2. process N
3. process K
4. process M
Which corresponds to a process of polymerisation? [op-68]
1. process L
2. process N
3. process K
4. process M
Which corresponds to a process of cracking? [op-69]
1. process L
2. process Q
3. process K
4. process M
Which corresponds to a very slow process, sometimes described as 'non-biodegradable'? [op-70]
1. process L
2. process Q
3. process N
4. process M
Which corresponds to the cause of the 'greenhouse effect'? [op-71]
1. process L
2. process Q
3. process N
4. process M
Which corresponds to changing bigger molecules into smaller molecules with heat and a catalyst? [op-72]
1. process K
2. process Q
3. process N
4. process L
Which corresponds to changing small molecules into big molecules? [op-73]
1. process M
2. process Q
3. process N
4. process K
Which corresponds to a process that works because different hydrocarbons in oil having different boiling points? [op-74]
1. process L
2. process K
3. process N
4. process M
Which corresponds to a process that causes acid rain? [op-75]
1. process Q
2. process K
3. process N
4. process M
Which corresponds to the process that makes extra petrol that wasn't originally in the crude oil? [op-76]
1. process M
2. process K
3. process N
4. process L
Which is a chemical test for the gas hydrogen? [op-77]
1. pops with lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper
Which is a chemical test for the gas carbon dioxide? [op-78]
1. pops with a lit splint
2. turns limewater cloudy
3. relights a glowing splint
4. bleaches damp litmus paper
Which is a chemical test for water? [op-79]
1. turns orange potassium dichromate paper green
2. turns universal indicator orange
3. turns blue cobalt chloride paper pink
4. turns litmus paper green
Which is a chemical test for water? [op-80]
1. turns orange potassium dichromate paper green
2. turns universal indicator turquoise
3. turns litmus paper green
4. turns white copper sulfate blue
Which of the following, when fossil fuels are burned, causes acid rain? [op-81]
1. sulfur dioxide
2. carbon dioxide
3. carbon (soot)
4. carbon monoxide
Which of the following, when fossil fuels are burned causes the 'greenhouse effect'? [op-82]
1. sulfur dioxide
2. carbon dioxide
3. carbon (soot)
4. carbon monoxide
Which of the following, when fossil fuels are burned, is formed when there is lack of oxygen? [op-83]
1. sulfur dioxide
2. carbon dioxide
3. carbon (soot)
4. nitrogen dioxide
Which of the following, when fossil fuels are burned, is formed when there is lack of oxygen? [op-84]
1. sulfur dioxide
2. carbon dioxide
3. nitrogen dioxide
4. carbon monoxide
At 1 the crude oil is a ..?.. of hydrocarbons. [op-85]
1. mixture
2. volatiles
3. compounds
4. viscous
At 2 the hydrocarbons are? [op-86]
1. big molecules
2. volatile
3. not very flammable
4. viscous
At 1-4 the hydrocarbons are a ..?.. of hydrogen and carbon. [op-87]
1. atom
2. mixture
3. compound
4. fraction
At 4 the hydrocarbons are very? [op-88]
1. volatile
2. runny
3. flammable
4. viscous
At 1 the hydrocarbon mixture is? [op-89]
1. dark in colour
2. very flammable
3. like diesel
4. very runny
At 2 the hydrocarbon mixture is? [op-90]
1. dark in colour
2. very flammable
3. like diesel
4. viscous
At 3 the hydrocarbon mixture is? [op-91]
1. very dark in colour
2. very flammable
3. like diesel
4. very viscous
At 4 the hydrocarbon mixture is? [op-92]
1. very light in colour
2. very flammable
3. like diesel
4. not very flammable
... Substance X is a hydrocarbon with a low boiling point.
... Substance Y is a hydrocarbon with a high boiling point.
Which statement is TRUE about the hydrocarbons X and Y? [op-93]
1. X has smallermolecules than Y
2. X is less flammable than Y
3. X is less volatile than Y
4. X has more carbon atoms than Y
Substance X is a hydrocarbon with a low boiling point.
Substance Y is a hydrocarbon with a high boiling point.
Which statement is TRUE about the hydrocarbons X and Y? [op-94]
1. X has larger molecules than Y
2. X is more flammable than Y
3. X is less volatile than Y
4. X has more carbon atoms than Y
Substance X is a hydrocarbon with a low boiling point.
Substance Y is a hydrocarbon with a high boiling point.
Which statement is TRUE about the hydrocarbons X and Y? [op-95]
1. X has larger molecules than Y
2. X is less flammable than Y
3. X is more volatile than Y
4. X has more carbon atoms than Y
Substance X is a hydrocarbon with a low boiling point.
Substance Y is a hydrocarbon with a high boiling point.
Which statement is TRUE about the hydrocarbons X and Y? [op-96]
1. X has larger molecules than Y
2. X is less flammable than Y
3. X is less volatile than Y
4. X has fewer carbon atoms than Y
Substance X is a hydrocarbon with a low boiling point.
Substance Y is a hydrocarbon with a high boiling point.
Which statement is TRUE about the hydrocarbons X and Y? [op-97]
1. X is less viscous than Y
2. X is less flammable than Y
3. X is less volatile than Y
4. X has more carbon atoms than Y
The main waste products of the combustion of a hydrocarbon fuel are? [op-98]
1. carbon and water
2. carbon dioxide and water
3. carbon dioxide and hydrogen
4. carbon monoxide and water
The 'clean' or complete combustion of methane (natural gas) produces? [op-99]
1. carbon dioxide and hydrogen
2. carbon and water
3. carbon dioxide and water
4. carbon monoxide and water
The combustion of hydrogen produces? [op-100]
1. carbon dioxide only
2. carbon and water
3. carbon dioxide and water
4. only water
Which is a suitable physical test for a liquid thought to be pure water by seeing if it? [op-119]
1. boils at a particular temperature
2. mixes with oil
3. dissolves salt
4. freezes
Which is a definition of an atom? [op-120]
1. the smallest particles of matter that make up substances
2. collection of substances which keep their own properties and easily separated
3. two or more atoms joined together to make a bigger particle
4. two or more elements chemically joined together and not easily separated
Which is a definition of a mixture? [op-121]
1. the smallest particles of matter that make up substances
2. collection of substances which keep their own properties and easily separated
3. two or more atoms joined together to make a bigger particle
4. two or more elements chemically joined together and not easily separated
Which is a definition of a molecule? [op-122]
1. the smallest particles of matter that make up substances
2. collection of substances which keep their own properties and easily separated
3. two or more atoms joined together to make a bigger particle
4. two or more elements chemically joined together and not easily separated
Which is a definition of a compound? [op-123]
1. the smallest particles of matter that make up substances
2. collection of substances which keep their own properties and easily separated
3. two or more atoms joined together to make a bigger particle
4. two or more elements chemically joined together and not easily separated
Which of the following means a 'hydrocarbon'? [op-124]
1. a mixture of carbon and hydrogen atoms
2. a molecule made of carbon and hydrogen atoms chemically combined
3. a mixture of carbon and hydrogen molecules
4. a molecule made from reacting carbon and water
Which statement is TRUE about polymers (plastics)? [op-125]
1. poly(ethene) is readily broken down by microorganisms
2. poly(propene) is not easily shaped when softened by heat
3. poly(ethene) is used for plastic bags
4. poly(propene) is not strong enough to make into ropes
Which statement is TRUE about polymers (plastics)? [op-126]
1. poly(ethene) is readily broken down by microorganisms
2. poly(propene) is not easily shaped when softened by heat
3. poly(ethene) is too expensive to use for plastic bags
4. poly(propene) is strong enough to make into ropes
Which statement is TRUE about polymers (plastics)? [op-127]
1. poly(ethene) is not readily broken down by microorganisms
2. poly(propene) is not easily shaped when softened by heat
3. poly(ethene) is too expensive to use for plastic bags and bottles
4. poly(propene) is not strong enough to make into ropes
Which statement is TRUE about polymers (plastics)? [op-128]
1. poly(ethene) is readily broken down by microorganisms
2. poly(propene) is easily shaped when softened by heat
3. poly(ethene) is too expensive to use for bottles
4. poly(propene) is too weak to make into ropes
Which statement is TRUE about polymers (plastics)? [op-129]
1. poly(ethene) is readily broken down by microorganisms
2. poly(propene) is not easily shaped when softened by heat
3. poly(ethene) is cheap to use for plastic bottles
4. poly(propene) is too weak to make into ropes
Which statement is TRUE about polymers (plastics)? [op-130]
1. poly(ethene) is readily broken down by microorganisms
2. poly(propene) is not easily shaped when softened by heat
3. poly(ethene) is too expensive to use for plastic bottles
4. poly(propene) is strong enough to make into crates
Which statement is TRUE about polymers (plastics)? [op-131]
1. poly(propene) is not biodegradable
2. poly(propene) is not easily shaped when softened by heat
3. poly(ethene) is too expensive to use for plastic bottles
4. poly(propene) is not strong enough to make into crates
Which statement is TRUE about polymers (plastics)? [op-132]
1. poly(propene) is biodegradable
2. poly(ethene) is easily shaped when softened by heat
3. poly(ethene) is too expensive to use for plastic bottles
4. poly(propene) is not strong enough to make into crates
Which explains why the gasoline fraction is used for petrol? [op-133]
1. not too flammable and not too viscous
2. quite viscous but will not freeze or evaporate easily
3. a liquid that is easily vapourised and not too viscous
4. can be liquified under pressure but easily changes back to a gas
Which explains why the refinery gas fraction is used for 'camping gaz' burners? [op-134]
1. not too flammable and not too viscous
2. quite viscous but will not freeze or evaporate easily
3. a liquid that is easily vapourised and not too viscous
4. can be liquified under pressure but easily changes back to a gas
Which explains why the fuel oil fraction is used for central heating? [op-135]
1. not too flammable and not too viscous
2. quite viscous but will not freeze or evaporate easily
3. a liquid that is easily vapourised and not too viscous
4. can be liquified under pressure but easily changes back to a gas
Which explains why the lubricating oil fraction is used as a lubricant? [op-136]
1. not too flammable and not too viscous
2. quite viscous but will not freeze or evaporate easily
3. a liquid that is easily vapourised and not too viscous
4. can be liquified under pressure but easily changes back to a gas
Which represents an addition polymerisation reaction? [op-137]
1. ethene ==> poly(ethene)
2. methane + oxygen ==> carbon dioxide + water
3. hexane ==> butane + ethene
4. ethene + bromine ==> dibromoethane
Which represents a combustion reaction? [op-138]
1. ethene ==> poly(ethene)
2. methane + oxygen ==> carbon dioxide + water
3. hexane ==> butane + ethene
4. ethene + bromine ==> dibromoethane
Which represents a cracking reaction? [op-139]
1. ethene ==> poly(ethene)
2. methane + oxygen ==> carbon dioxide + water
3. hexane ==> butane + ethene
4. ethene + bromine ==> dibromoethane
Which represents a reaction that tests for ethene? [op-140]
1. ethene ==> poly(ethene)
2. ethene + oxygen ==> carbon dioxide + water
3. hexane ==> butane + ethene
4. ethene + bromine ==> dibromoethane
Below is a list of processes involved in the petrochemical industry.
1. combustion , 2. cracking , 3. drilling , 4. fractional distillation , 5. polymerisation
Which is the correct order to produce a plastic? [op-141]
1. 3 2 4 5
2. 2 5 1 4
3. 3 4 2 5
4. 4 2 3 5
Carbon monoxide has the formula CO. It is therefore? [op-142]
1. an atom
2. an element
3. a mixture
4. a compound
Which is a single compound? [op-143]
1. methane
2. carbon
3. lubricating oil
4. hydrogen
Which is a solid element? [op-144]
1. methane
2. carbon
3. bitumen tar
4. wax
Which is a mixture? [op-145]
1. methane
2. carbon
3. product(s) of burning methane
4. hydrogen
Which is a particularly toxic gas sometimes produced by faulty gas fires? [op-146]
1. methane
2. carbon dioxide
3. nitrogen
4. carbon monoxide
Which represents a thermal decomposition reaction? [op-147]
1. ethene ==> poly(ethene)
2. methane + oxygen ==> carbon dioxide + water
3. hexane ==> butane + ethene
4. ethene + bromine ==> dibromoethane
Which is a thermal decompostion reaction in the petrochemical industry? [op-148]
1. combustion
2. addition polymerisation
3. fractional distillation
4. cracking
What is formed by the complete combustion of wax? [op-161]
1. water + carbon dioxide
2. water only
3. carbon dioxide only
4. carbon monoxide and water
What may be formed by the incomplete combustion of petrol? [op-162]
1. water + carbon dioxide
2. water, carbon dioxide and carbon monoxide
3. only carbon dioxide
4. only water
Drips of a colourless liquid were seen at the end of a car exhaust. The colourless liquid is most likely to be? [op-163]
1. unburned petrol
2. engine oil
3. water
4. partly burned petrol
A samle of gas from a car exhaust was tested with limewater and gave a white precipitate. The gas was most likely to be? [op-164]
1. carbon monoxide
2. unburned petrol vapour
3. partly burned petrol vapour
4. carbon dioxide
Poly(ethene) and poly(propene) are described as examples of? [op-165]
1. plastics
2. fuels
3. hydrocarbons
4. crackates
Petrol and diesel are best described as examples of? [op-165]
1. plastics
2. fuels
3. lubricants
4. crackates
Incomplete combustion can happen when there is a shortage of? [op-167]
1. carbon dioxide
2. fuel
3. oxygen
4. carbon monoxide
Biodegradable plastics are environmentally friendly because they? [op-168]
1. are structurally weak
2. don't produce harmful fumes when burned
3. are not attacked by fungus
4. rot away in a land fill site
Which is a hydrocarbon molecule? [op-169]
1. C₂H₆
2. C₂H₅Br
3. C₂H₅OH
4. CH₃COOH
$fractionQ.jpg$ The following 'carbon numbers' correspond to gasoline, bottled gas, bitumen and kerosine. Which is likely to be gasoline? [op-170]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to gasoline, bottled gas, bitumen and kerosine. Which is likely to be kerosine? [op-171]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to gasoline, bottled gas, bitumen and kerosine. Which is likely to be bitumen? [op-172]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to gasoline, bottled gas, bitumen and kerosine. Which is likely to be bottled gas? [op-173]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The 'carbon numbers' correspond to molecules with different uses: for road surfacing, petrol engine fuel, camping gas and diesel egine fuel. Which best matches petrol fuel? [op-174]
1. 3 carbon atoms
2. 8 carbon atoms
3. 20 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The 'carbon numbers' correspond to molecules with different uses: for road surfacing, petrol engine fuel, camping gas and diesel egine fuel. Which best matches diesel fuel? [op-175]
1. 3 carbon atoms
2. 8 carbon atoms
3. 20 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The 'carbon numbers' correspond to molecules with different uses: for road surfacing, petrol engine fuel, camping gas and diesel egine fuel. Which best matches road surfacing material? [op-176]
1. 3 carbon atoms
2. 8 carbon atoms
3. 20 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The 'carbon numbers' correspond to molecules with different uses: for road surfacing, petrol engine fuel, camping gas and diesel egine fuel. Which best matches camping gas? [op-177]
1. 3 carbon atoms
2. 8 carbon atoms
3. 20 carbon atoms
4. over 40 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to hydrocarbon molecules with different characteristics. These are: a not very flammable oily liquid, a light flammable liquid, a thick viscous (sticky) liquid, and a flammable gas. Which corresponds to a light flammable liquid? [op-178]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. 30 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to hydrocarbon molecules with different characteristics. These are: a not very flammable oily liquid, a light flammable liquid, a thick viscous (sticky) liquid, and a flammable gas. Which corresponds to a not very flammable liquid? [op-179]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. 30 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to hydrocarbon molecules with different characteristics. These are: a not very flammable oily liquid, a light flammable liquid, a thick viscous (sticky) liquid, and a flammable gas. Which corresponds to a thick viscous liquid? [op-180]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. 30 carbon atoms
$fractionQ.jpg$ The following 'carbon numbers' correspond to hydrocarbon molecules with different characteristics. These are: a not very flammable oily liquid, a light flammable liquid, a thick viscous (sticky) liquid, and a flammable gas. Which corresponds to a flammable gas? [op-181]
1. 3 carbon atoms
2. 8 carbon atoms
3. 15 carbon atoms
4. 30 carbon atoms
Which is a plastic? [op-182]
1. petrol
2. polythene
3. paraffin
4. propanol
Which is a plastic? [op-183]
1. petrol
2. paraffin
3. polypropene
4. propanol
Which is a plastic? [op-184]
1. PDB
2. ASE
3. DDT
4. PVC
Which reaction is causes the high temperature in a blast furnace? [me-9]
1. carbon + oxygen ==> carbon dioxide
2. carbon dioxide + carbon ==> carbon monoxide
3. iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
4. calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
In which reaction does an oxidation and a reduction produce the same product? [me-10]
1. carbon + oxygen ==> carbon dioxide
2. carbon dioxide + carbon ==> carbon monoxide
3. iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
4. calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
Which reaction represents the iron ore reduction in a blast furnace? [me-11]
1. carbon + oxygen ==> carbon dioxide
2. carbon dioxide + carbon ==> carbon monoxide
3. iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
4. calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
Which of these blast furnace reactions is the most exothermic? [me-13]
1. carbon + oxygen ==> carbon dioxide
2. carbon dioxide + carbon ==> carbon monoxide
3. iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
4. calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
Which reaction produces the molecule that reduces the iron ore to iron? [me-14]
1. carbon + oxygen ==> carbon dioxide
2. carbon dioxide + carbon ==> carbon monoxide
3. iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
4. calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide
In which of these blast furnace reactions does one gas molecule get oxidised to another gas molecule? [me-15]
1. carbon + oxygen ==> carbon dioxide
2. carbon dioxide + carbon ==> carbon monoxide
3. iron(III) oxide + carbon monoxide ==> iron + carbon dioxide
4. calcium carbonate + silicon dioxide ==> calcium silicate + carbon dioxide

In the reactions in a blast furnace what happens to most of the carbon monoxide? [me-22]
1. it reacts with carbon to form carbon dioxide
2. it combines with the oxygen in the iron oxide ore
3. it reacts with the oxygen in the hot air to form carbon dioxide
4. it reacts with silica and limestone to form the 'slag'
Oxidation of a substance can be defined as? [me-23]
1. a molecule reacting with oxygen molecules
2. an atom losing oxygen atoms
3. an atom or molecule combining with oxygen
4. a molecule losing oxygen atoms
Reduction of a substance can be defined as? [me-24]
1. a molecule not reacting with oxygen molecules
2. an atom gaining oxygen atoms
3. an atom or molecule combining with oxygen
4. a molecule losing oxygen atoms
To produce aluminium, electricity is passed through? [me-31]
1. molten aluminium oxide and molten cryolite
2. molten cryolite
3. molten aluminium oxide
4. molten aluminium oxide and molten limestone
To produce aluminium by electrolysis the ore must be molten so that? [me-32]
1. the aluminium oxide decomposes with the heat
2. the ions from the ore are free to move
3. the molecules from the ore are free to move
4. the aluminium formed will be liquid
During the electrolysis of molten aluminium oxide ore, the aluminium ions move? [me-33]
1. to the negative electrode because they are negatively charged
2. to the positive electrode because they are positively charged
3. to the negative electrode because they are positively charged
4. to the positive electrode because they are negatively charged
During the electrolysis of molten aluminium oxide ore, the oxide ions move? [me-34]
1. to the negative electrode because they are negatively charged
2. to the positive electrode because they are positively charged
3. to the negative electrode because they are positively charged
4. to the positive electrode because they are negatively charged
In the extraction of aluminium by electrolysis of molten aluminium oxide ore, the ore is dissolved in cryolite to? [me-35]
1. lower the melting point of the aluminium ore to reduce the temperature of the process
2. to decompose the ore into aluminium and oxygen at a higher temperature
3. to help keep the aluminium molten at a higher temperature
4. to help stop the electrodes from corroding away at high temperature
In the extraction of aluminium by electrolysis of its ore, the positive electrodes have to be regularly replaced because? [me-36]
1. they are attacked by hot molten aluminium
2. they react with oxygen to form a gas
3. they slowly dissolve in cryolite
4. they gradually vaporise at the high temperature of the electrolysis cell
In the extraction of aluminium by the electrolysis of molten aluminium oxide ore, the aluminium forms? [me-37]
1. throughout the bulk of the molten ore
2. only when the electrodes are close together
3. only at the negative electrode
4. only at the positive electrode
In the extraction of aluminium by the electrolysis of molten aluminium oxide ore, oxygen forms? [me-38]
1. throughout the bulk of the molten ore
2. only when the electrodes are close together
3. only at the negative electrode
4. only at the positive electrode
The name of a common ore from which iron can be extracted is called? [me-39]
1. haematite
2. bauxite
3. cryolite
4. charcoal
The name of a common ore from which aluminium can be extracted is called? [me-40]
1. haematite
2. bauxite
3. cryolite
4. charcoal
The name of the substance used to lower the melting point of aluminium oxide ore in the electrolytic extraction of aluminium is called? [me-41]
1. haematite
2. bauxite
3. cryolite
4. carbon
In the electrolysis of aluminium oxide to extract aluminium, the electrodes are made of? [me-42]
1. haematite
2. bauxite
3. cryolite
4. carbon
After the initial chemical extraction of copper from a copper ore, the copper is purified by? [me-51]
1. electrolysis
2. crystallisation
3. distillation
4. hydrolysis
After the initial chemical extraction of copper from a copper ore, the copper is purified by electrolysis. The negative electrode is made of? [me-52]
1. copper sulfide
2. pure copper
3. impure copper
4. copper sulfate
After the initial chemical extraction of copper from a copper ore, the copper is purified by electrolysis. The positive electrode is made of? [me-53]
1. copper sulfide
2. pure copper
3. impure copper
4. copper sulfate
After the initial chemical extraction of copper from a copper ore, the copper is purified by electrolysis. The electrolyte solution contains dissolved? [me-54]
1. copper sulfide
2. pure copper
3. impure copper
4. copper sulfate
Which element is a metal that is most likely to be found in rocks as the metal itself? [me-55]
1. copper
2. carbon
3. iron
4. sodium
Which element is a non-metal with some metallic character? [me-56]
1. copper
2. carbon
3. iron
4. sodium
Which element is a metal that displaces hydrogen from dilute acids but not from cold water? [me-57]
1. copper
2. carbon
3. iron
4. sodium
Which element is a metal that cannot be extracted using carbon? [me-58]
1. copper
2. tin
3. iron
4. sodium
Which metal is more reactive than hydrogen but less reactive than carbon? [me-59]
1. tin
2. aluminium
3. copper
4. silver
Which metal is less reactive than sodium but must be extracted using electrolysis of the molten ore? [me-60]
1. tin
2. aluminium
3. lead
4. silver
Which of these metals should react with dilute hydrochloric acid, but very slowly? [me-61]
1. calcium
2. iron
3. lead
4. silver
Which metal is most likely to be found in rocks as the metal itself? [me-62]
1. tin
2. aluminium
3. lead
4. silver
Which contains the iron oxide in the blast furnace extraction of iron? [me-63]
1. haematite
2. coke
3. limestone
4. sandstone
Which is oxidised in the blast furnace extraction of iron? [me-64]
1. haematite
2. coke
3. limestone
4. air
Which is NOT a raw material in the blast furnace extraction of iron? [me-66]
1. haematite
2. coke
3. limestone
4. sandstone
Which metals is obtained from bauxite ore? [me-67]
1. aluminium
2. iron
3. copper
4. gold
Which metals is obtained from haematite ore? [me-68]
1. aluminium
2. iron
3. copper
4. gold
Which metals is purified by electrolysis? [me-69]
1. aluminium
2. iron
3. copper
4. gold
Which metals is most likely to be found as the element and not as an oxide or sulfide compound? [me-70]
1. aluminium
2. iron
3. copper
4. gold
Which statement is TRUE? [me-71]
1. aluminium is obtained from its ore by reduction using electrolysis
2. iron is obtained from its ore by reduction using electrolysis
3. aluminium is obtained from its ore by oxidation using carbon
4. iron is obtained from its ore by oxidation using carbon
Which statement is TRUE? [me-72]
1. aluminium is obtained from its ore by reduction using carbon
2. iron is obtained from its ore by reduction using carbon
3. aluminium is obtained from its ore by oxidation using electrolysis
4. iron is obtained from its ore by oxidation using electrolysis
A mineral from which a metal can be extracted, is called? [me-73]
1. compound
2. mixture
3. an ore
4. rock
Which is the reason why aluminium was first extracted commercially by electrolysis in the 19th century but metals like iron had been extracted for thousands of years? [me-74]
1. no aluminium ores had been previously discovered
2. there was no electricity supply available until this time
3. no one was interested in using aluminium
4. technology was sufficiently advanced by then
Which metal is added to aluminium to make a stronger alloy? [me-77]
1. magnesium
2. chromium
3. gold
4. sodium
Which metal is added to steel to give it good anti-corrosion properties? [me-78]
1. magnesium
2. chromium
3. gold
4. sodium
Which metal is found as the free element in the Earth's crust? [me-79]
1. magnesium
2. chromium
3. gold
4. sodium
Which metal is less reactive than calcium, but whose oxide ore cannot be reduced with carbon? [me-80]
1. sodium
2. potassium
3. zinc
4. magnesium
Which chemical change corresponds to an electrolysis? [me-81]
1. aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
2. calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
3. carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
4. calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to a thermal decomposition? [me-82]
1. aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
2. calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
3. carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
4. calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to an oxidation? [me-83]
1. aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
2. calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
3. carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
4. calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to a neutralisation? [me-84]
1. aluminium and oxygen are produced when an electric current is passed through molten aluminium oxide
2. calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
3. carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
4. calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water
Which chemical change corresponds to a reduction? [me-85]
1. changing copper oxide into copper in a smelter
2. calcium carbonate forms calcium oxide and carbon dioxide in the blast furnace extraction of iron
3. carbon monoxide reacts with iron oxide to form carbon dioxide in the blast furnace
4. calcium hydroxide reacts with acid waste gases from an industrial metal extraction process to form a harmless salt and water

Why is hot air blown into a blast furnace? [me-87]
1. too keep the iron molten
2. to melt the iron ore
3. to react with coke and release energy
4. to react with impurities in the iron
Which is formed on burning coke in the blast furnace? [me-88]
1. calcium oxide
2. slag
3. carbon monoxide
4. carbon dioxide
Which removes the oxygen from the iron ore in a blast furnace? [me-89]
1. carbon monoxide
2. slag
3. limestone
4. carbon dioxide
Which is produced when limestone combines with acidic impurities in the blast furnace extraction of iron? [me-90]
1. carbon monoxide
2. slag
3. iron oxide
4. carbon dioxide
Which is added to a blast furnace to produce carbon monoxide and heat energy? [me-91]
1. calcium oxide
2. limestone
3. carbon
4. carbon dioxide
Haematite iron ore contains mainly? [me-92]
1. iron oxide and slag impurities
2. iron carbonate and calcium oxide
3. iron carbonate and slag impurities
4. iron oxide and acidic impurities
Ingots of aluminium from its electrolytic extraction can be stored outside in all weathers. Why do aluminium ingots not corrode away, despite aluminium being quite high in the reactivity series of metals? [me-93]
1. aluminium is coated in an oxide layer
2. aluminium will not react with oxygen
3. aluminium has a particularly shiny surface
4. it is not a transition metal like chromium
Which pair of elements are non-metals which will displace less reactive metals from their oxide ores? [me-94]
1. nitrogen and helium
2. carbon and hydrogen
3. sulfur and oxygen
4. chlorine and argon
Which metal is less reactive than copper? [mr-1]
1. Gold
2. Sodium
3. Iron
4. Aluminium
Which metal is more reactive than magnesium? [mr-2]
1. Gold
2. Sodium
3. Iron
4. Aluminium
Which metal is more reactive than hydrogen but less reactive than carbon? [mr-3]
1. Gold
2. Sodium
3. Iron
4. Aluminium
Which metal is less reactive than sodium but cannot be extracted using carbon? [mr-4]
1. Gold
2. Potassium
3. Iron
4. Aluminium
Which is formed when a metal reacts with cold water? [mr-5]
1. a metal hydroxide
2. a salt
3. carbon dioxide
4. an oxide
Which is a compound formed when a metal reacts with an acid? [mr-6]
1. a metal hydroxide
2. a salt
3. hydrogen
4. an oxide
Which is formed when a metal reacts with either water or an acid? [mr-7]
1. a metal hydroxide
2. a salt
3. hydrogen
4. an oxide
Which is formed when a heated metal reacts with steam? [mr-8]
1. a metal hydroxide
2. a salt
3. carbon dioxide
4. an oxide
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ...
Metal Wa does not readily react with dilute acid
Metals Xb and Yc react slowly with acid
Metal Zd will displace Yc from the sulfate salt solution of Yc, YcSO_4(aq).
Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl_2(aq).
If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ...
which metal corresponds to (1), the most reactive of the four metals? [mr-9]
1. metal Xb
2. metal Zd
3. metal Yc
4. metal Wa
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ...
Metal Wa does not readily react with dilute acid
Metals Xb and Yc react slowly with acid
Metal Zd will displace Yc from the sulfate salt solution of Yc, YcSO_4(aq).
Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl_2(aq).
If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ...
which metal corresponds to (2), the 2nd most reactive of the four metals? [mr-10]
1. metal Xb
2. metal Zd
3. metal Yc
4. metal Wa
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ...
Metal Wa does not readily react with dilute acid
Metals Xb and Yc react slowly with acid
Metal Zd will displace Yc from the sulfate salt solution of Yc, YcSO_4(aq).
Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl_2(aq).
If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ...
which metal corresponds to (3), the 3rd most reactive of the four metals? [mr-11]
1. metal Xb
2. metal Zd
3. metal Yc
4. metal Wa
Information is given below on the reactivity of four metals Wa, Xb, Yc and Zd (NOT their real chemical symbols) ...
Metal Wa does not readily react with dilute acid
Metals Xb and Yc react slowly with acid
Metal Zd will displace Yc from the sulfate salt solution of Yc, YcSO_4(aq).
Metal Zd will NOT displace Xb from the chloride salt solution of Xb, XbCl_2(aq).
If their reactivity order is from the most reactive (1) (2) (3) (4) to the least reactive ...
which metal corresponds to (4), the least reactive of the four metals? [mr-12]
1. metal Xb
2. metal Zd
3. metal Yc
4. metal Wa
From the four elements listed, which is a metal which is most likely to be found in the ground as the metal itself? [mr-13]
1. copper
2. hydrogen
3. iron
4. magnesium
From the four elements listed, which is a non-metal with no metallic character at all? [mr-14]
1. copper
2. hydrogen
3. iron
4. magnesium
From the four elements listed, which is a metal that displaces hydrogen from acids but not from cold water? [mr-15]
1. copper
2. gold
3. iron
4. magnesium
From the four elements listed, which is a metal that cannot be extracted by displacement with carbon? [mr-16]
1. copper
2. hydrogen
3. iron
4. magnesium
Which is formed by the reaction of heated magnesium with steam? [mr-17]
1. magnesium oxide + hydrogen
2. magnesium hydroxide + hydrogen
3. magnesium chloride + hydrogen
4. magnesium sulfate + hydrogen
Which is formed by the reaction of magnesium with cold water? [mr-18]
1. magnesium oxide + hydrogen
2. magnesium hydroxide + hydrogen
3. magnesium chloride + hydrogen
4. magnesium sulfate + hydrogen
Which is formed by the reaction of magnesium with hydrochloric acid? [mr-19]
1. magnesium chloride + water
2. magnesium hydroxide + hydrogen
3. magnesium chloride + hydrogen
4. magnesium sulfate + chlorine
Which is formed by the reaction of magnesium with sulfuric acid? [mr-20]
1. magnesium sulfate + water
2. magnesium hydroxide + sulfur dioxide
3. magnesium chloride + hydrogen
4. magnesium sulfate + hydrogen
Which of A to D is less reactive than copper? [mr-21]
1. Platinum
2. Potassium
3. Zinc
4. Magnesium
Which is more reactive than magnesium? [mr-22]
1. Platinum
2. Potassium
3. Zinc
4. Tin
Which is more reactive than hydrogen but less reactive than carbon? [mr-23]
1. Platinum
2. Potassium
3. Zinc
4. Magnesium
Which is less reactive than sodium but cannot be extracted from its ore using carbon? [mr-24]
1. Platinum
2. Potassium
3. Zinc
4. Magnesium
Which is found in rocks as the metal itself? [mr-25]
1. Gold
2. Carbon
3. Zinc
4. Potassium
Which is a non-metal with a little metallic character? [mr-26]
1. Gold
2. Carbon
3. Zinc
4. Potassium
Which is a metal that displaces hydrogen from dilute acids but not from cold water? [mr-27]
1. Gold
2. Carbon
3. Zinc
4. Potassium
Which cannot be extracted from its ore with carbon? [mr-28]
1. Gold
2. iron
3. Zinc
4. Potassium
Which of these in contact with iron will cause rusting? [mr-29]
1. air and water
2. boiled saltwater
3. dry pure oxygen
4. pure boiled water
A steel pier in the sea rusts. The rust consists of? [mr-30]
1. iron carbonate
2. iron oxide
3. iron chloride
4. iron sulfate
Which of these reactions is possible? [mr-33]
1. CuO + Zn ==> ZnO + Cu
2. Pb + ZnCl₂ ==> PbCl₂ + Zn
3. Cu + FeSO₄ ==> CuSO₄ + Fe
4. Au + 2HCl ==> AuCl₂ + H₂
Which of these reactions is possible? [mr-34]
1. PbO + Cu ==> CuO + Pb
2. Zn + PbCl₂ ==> ZnCl₂ + Pb
3. Cu + FeSO₄ ==> CuSO₄ + Fe
4. Pt + 2HCl ==> PtCl₂ + H₂
Which of these reactions is possible? [mr-35]
1. SnO + Cu ==> CuO + Sn
2. Pb + SnCl₂ ==> PbCl₂ + Sn
3. Fe + CuSO₄ ==> FeSO₄ + Cu
4. Cu + H₂SO₄ ==> CuSO₄ + H₂
Which of these reactions is possible? [mr-36]
1. PbO + Pt ==> PtO + Pb
2. Pb + SnCl₂ ==> PbCl₂ + Sn
3. Pt + CuSO₄ ==> PtSO₄ + Cu
4. Sn + H₂SO₄ ==> SnSO₄ + H₂
Which of these reactions is possible? [mr-37]
1. lead + copper oxide ==> lead oxide + copper
2. copper + hydrochloric acid ==> copper chloride + hydrogen
3. iron + zinc sulfate ==> iron sulfate + zinc
4. lead + tin sulfate ==> lead sulfate + tin
Which of these reactions is possible? [mr-38]
1. lead + zinc oxide ==> lead oxide + zinc
2. zinc + hydrochloric acid ==> zinc chloride + hydrogen
3. tin + zinc sulfate ==> tin sulfate + zinc
4. lead + tin sulfate ==> lead sulfate + tin
Which of these reactions is possible? [mr-39]
1. copper + zinc oxide ==> copper oxide + zinc
2. platinum + sulfuric acid ==> platinum sulfate + hydrogen
3. zinc + iron sulfate ==> zinc sulfate + iron
4. gold + tin chloride ==> gold chloride + tin
Which of these reactions is possible? [mr-40]
1. silver + copper oxide ==> silver oxide + copper
2. copper + sulfuric acid ==> copper sulfate + hydrogen
3. iron + zinc chloride ==> iron chloride + zinc
4. tin + gold sulfate ==> tin sulfate + gold
Rust readily forms if an iron object is surrounded by? [mr-45]
1. water with dissolved oxygen
2. water with no dissolved oxygen
3. boiled dilute acid
4. dry air
Which of the following cannot be predicted about metal X, given its position in the reactivity series of metals? [mr-46]
1. whether X reacts with acid to form hydrogen
2. whether X acts as a catalyst
3. the method of extraction of X from an ore
4. the product of reacting metal X with the sulfate solution of another metal
Which will displace iron from iron oxide? [mr-47]
1. tin
2. copper
3. magnesium
4. silver
Road tankers carrying acid use steel tanks lined with glass. The glass is used because? [mr-48]
1. glass only reacts with alkalis
2. steel is not strong enough on its own
3. glass is flexible enough to withstand a crash
4. acid reacts with steel forming hydrogen
Corrosion occurs when a metal is attacked by? [mr-49]
1. oxygen
2. hydrogen
3. nitrogen
4. carbon dioxide
When scrap iron is added to blue copper sulfate solution, a pinky-brown deposit is formed and a pale green solution is left above it. The pinky-brown deposit is? [mr-50]
1. steel
2. copper metal
3. iron sulfate
4. rust
When scrap iron is added to blue copper sulfate solution, a pinky-brown deposit is formed and a pale green solution is left above it. The pale green solution is of? [mr-51]
1. sulfuric acid
2. iron oxide
3. iron sulfate
4. copper chloride
When iron becomes coated in rust, the chemical process is an example of? [mr-52]
1. electrolysis
2. electroplating
3. reduction
4. oxidation
The steel hulls of ships can be protected from rusting by bolting on blocks of which more reactive metal? [mr-61]
1. zinc
2. tin
3. copper
4. iron
Steel pipes underground can be protected from rusting by attaching blocks of the more reactive metal? [mr-62]
1. tin
2. magnesium
3. copper
4. iron
Aluminium window frames do not corrode away because the aluminium is? [mr-63]
1. not reactive enough with oxygen
2. not reactive enough with water
3. coated in a layer of aluminium oxide
4. not capable of forming an oxide
The rusting of iron is described as an oxidation because the iron atoms? [mr-65]
1. combine with oxygen atoms
2. gain electrons
3. combine with water molecules
4. are so reactive
Which reacts with water to form hydrogen? [mr-66]
1. zinc
2. potassium
3. copper
4. mercury
Salt water speeds up the corrosion of metals because it contains ions from salts like sodium chloride. Aluminium can be used for the upper structures of ships because the aluminium? [mr-68]
1. will not react at all with sea water
2. will not react with oxygen
3. is not capable of forming soluble aluminium chloride
4. is coated in a protective layer of aluminium oxide
In which reaction is a metal oxidised? [mr-69]
1. magnesium + water (steam) ==> magnesium oxide + hydrogen
2. carbon + oxygen ==> carbon dioxide
3. hydrogen + lead oxide ==> lead + water
4. copper oxide + carbon ==> copper + carbon dioxide
In which reaction is a solid non-metal oxidised? [mr-70]
1. magnesium + water (steam) ==> magnesium oxide + hydrogen
2. carbon + water ==> hydrogen + carbon monoxide
3. hydrogen + lead oxide ==> lead + water
4. copper oxide + hydrogen ==> copper + water
In which reaction is a gaseous non-metal oxidised? [mr-71]
1. magnesium + water ==> magnesium hydroxide + hydrogen
2. carbon + water ==> hydrogen + carbon monoxide
3. hydrogen + lead oxide ==> lead + water
4. copper oxide + carbon ==> copper + carbon dioxide
In which reaction is a metal oxide reduced? [mr-72]
1. magnesium + water ==> magnesium hydroxide + hydrogen
2. carbon + water ==> hydrogen + carbon monoxide
3. water (steam) + magnesium ==> magnesium oxide + hydrogen
4. copper oxide + carbon ==> copper + carbon dioxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as an oxidation only? [mr-73]
1. carbon ==> carbon monoxide
2. lead oxide ==> lead
3. copper oxide + hydrogen ==> copper + water
4. carbon dioxide ==> carbon monoxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as a reduction only? [mr-74]
1. carbon ==> carbon monoxide
2. lead oxide ==> lead
3. copper oxide + hydrogen ==> copper + water
4. carbon monoxide ==> carbon dioxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as an oxidation and reduction (redox)? [mr-75]
1. carbon ==> carbon monoxide
2. lead oxide ==> lead
3. copper oxide + hydrogen ==> copper + water
4. carbon monoxide ==> carbon dioxide
Four chemical changes are shown below as part, or full, word equations. Which can be described as an oxidation and reduction (redox)? [mr-76]
1. carbon ==> carbon monoxide
2. lead oxide ==> lead
3. carbon dioxide ==> carbon monoxide
4. iron oxide + carbon ==> iron + carbon dioxide
Given the following four observations of the reactions of four metals ...
(1) Metals F and G slowly react with water
(2) Metal H will displace metal G form its chloride salt solution
(3) Metal E will not react with dilute acids
(4) Metal H will NOT displace metal F from its sulfate salt solution
What is their reactivity order, from the most to the least reactive? [mr-86]
1. F > H > G > E
2. H > E > F > G
3. E > G > H > F
4. H > G > F > E
Given the following five observations of the reactions of four metals with hydrogen (H), carbon (C) and other metal oxides ...
(1) Metal Y can displace metal Z from its oxide
(2) Carbon can displace metal W and metal X from their oxides
(3) Hydrogen will displace metal W from its oxide
(4) Hydrogen will NOT displace metal X from its oxide
(5) Carbon will NOT displace metals Y and Z from their oxides
What is their reactivity order, from the most to the least reactive? [mr-87]
1. (C) > W > X (H) > Y > Z
2. Y > Z > (C) > X > (H) > W
3. Z > Y > (C) > W > (H) > X
4. Y > W > (C) > X > (H) > Z
Underground pipes made of steel (alloy of iron) can be protected from rusting if you attach metal blocks made of the more reactive metal? [mr-88]
1. chromium alloy
2. less reactive metal than iron
3. metal more reactive than iron
4. a metal of similar reactivity
When copper is heated in air, the oxide compound formed is ? in colour. [mr-92]
1. green
2. orange
3. black
4. white
When magnesium burns in air, the oxide compound formed is ? in colour. [mr-93]
1. green
2. orange
3. black
4. white
Given the following three observations of the reactions of four metals ...
(1) Metal O will displace metal N from its chloride
(2) Only metal L reacts with cold water
(3) Metal N reacts faster with acid than metal M
What is their reactivity order, from the most to the least reactive? [mr-94]
1. L > O > N > M
2. O > L > N > M
3. L > N > O > M
4. M > O > N > L
In the electrolysis of moderately concentrated sodium chloride solution (brine) using carbon/platinum electrodes, the principal product formed at the positive anode is? [ef1]
1. chlorine
2. hydrogen
3. oxygen
4. sodium
In the electrolysis of moderately concentrated sodium chloride solution (brine) using carbon/platinum electrodes, the principal product formed at the negative cathode is? [ef2]
1. chlorine
2. hydrogen
3. oxygen
4. sodium
When copper(II) sulfate solution undergoes electrolysis using carbon/platinum electrodes the product at the positive anode is? [ef3]
1. sulfur
2. hydrogen
3. oxygen
4. copper
When copper(II) sulfate solution undergoes electrolysis using carbon/platinum electrodes the product at the negative cathode is? [ef4]
1. sulfur
2. hydrogen
3. oxygen
4. copper
In the electrolysis of sodium sulfate solution with carbon/platinum electrodes, what product is formed on the surface of the negative cathode? [ef5]
1. hydrogen
2. oxygen
3. sodium
4. sulfur dioxide
In the electrolysis of sodium sulfate solution with carbon/platinum electrodes, what product is formed on the surface of the positive anode? [ef6]
1. hydrogen
2. oxygen
3. sodium
4. sulfur dioxide
In the electrolysis of water acidified with sulfuric acid, using carbon/platinum electrodes, what product is formed on the surface of the negative cathode? [ef7]
1. sulfur
2. sulfur dioxide
3. hydrogen
4. oxygen
In the electrolysis of water acidified with sulfuric acid, using carbon/platinum electrodes, what product is formed on the surface of the positive anode? [ef8]
1. copper ions
2. sulfur dioxide
3. hydrogen
4. oxygen
When copper(II) sulfate solution undergoes electrolysis using a carbon cathode and copper anode electrodes the product at the negative cathode is? [ef9]
1. copper
2. blue copper(II) ions
3. oxygen
4. hydrogen
When copper(II) sulfate solution undergoes electrolysis using a carbon cathode and copper anode electrodes the product at the positive anode is? [ef10]
1. copper
2. blue copper(II) ions
3. oxygen
4. hydrogen
When copper(II) chloride solution undergoes electrolysis using a carbon/platinum electrodes the product at the negative cathode is? [ef11]
1. hydrogen
2. blue copper(II) ions
3. copper
4. chlorine
When copper(II) chloride solution undergoes electrolysis using a carbon/platinum electrodes the product at the positive anode is? [ef12]
1. hydrogen
2. blue copper(II) ions
3. copper
4. chlorine
Which of the following statements is FALSE concerning the electrolysis of molten lead bromide, PbBr₂ ? [ef13]
1. solid lead bromide can also undergo electrolysis
2. lead is formed at the cathode
3. bromine is formed at the anode
4. molten lead bromide can be decomposed by the passage of a d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten lead bromide, PbBr₂ ? [ef14]
1. solid lead bromide cannot undergo electrolysis
2. lead oxide is formed at the cathode
3. bromine is formed at the anode
4. molten lead bromide can be decomposed by the passage of a d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten lead bromide, PbBr₂ ? [ef15]
1. solid lead bromide cannot undergo electrolysis
2. lead is formed at the cathode
3. oxygen is formed at the anode
4. molten lead bromide can be decomposed by the passage of a d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten lead bromide, PbBr₂ ? [ef16]
1. solid lead bromide cannot undergo electrolysis
2. lead is formed at the cathode
3. bromine is formed at the anode
4. molten lead bromide can be decomposed by the passage of an a.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten sodium chloride, NaCl ? [ef17]
1. solid sodium chloride can also undergo electrolysis
2. sodium is formed at the cathode
3. chlorine is formed at the anode
4. molten sodium chloride can be decomposed by the passage of an d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten sodium chloride, NaCl ? [ef18]
1. solid sodium chloride cannot undergo electrolysis
2. sodium is oxidised at the cathode
3. chlorine is formed at the anode
4. molten sodium chloride can be decomposed by the passage of an d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten sodium chloride, NaCl ? [ef19]
1. solid sodium chloride cannot undergo electrolysis
2. sodium is formed at the cathode
3. chlorine is oxidised at the anode
4. molten sodium chloride can be decomposed by the passage of an d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten sodium chloride, NaCl ? [ef20]
1. solid sodium chloride cannot undergo electrolysis
2. sodium is formed at the cathode
3. chlorine is formed at the anode
4. molten sodium chloride can be decomposed by the passage of an a.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten aluminium oxide, Al₂O₃ ? [ef21]
1. solid aluminium oxide can also undergo electrolysis
2. aluminium is formed at the cathode
3. oxygen is formed at the anode
4. molten aluminium oxide can be decomposed by the passage of an d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten aluminium oxide, Al₂O₃ ? [ef22]
1. solid aluminium oxide cannot undergo electrolysis
2. aluminium is oxidised at the cathode
3. oxygen is formed at the anode
4. molten aluminium oxide can be decomposed by the passage of an d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten aluminium oxide, Al₂O₃ ? [ef23]
1. solid aluminium oxide cannot undergo electrolysis
2. aluminium is formed at the cathode
3. oxygen cannot form at the anode
4. molten aluminium oxide can be decomposed by the passage of an d.c. electric current
Which of the following statements is FALSE concerning the electrolysis of molten aluminium oxide, Al₂O₃ ? [ef24]
1. solid aluminium oxide cannot undergo electrolysis
2. aluminium is formed at the cathode
3. oxygen is formed at the anode
4. molten aluminium oxide can be decomposed by the passage of an a.c. electric current
When copper(II) sulfate solution undergoes electrolysis using copper electrodes the product at the positive anode is? [ef25]
1. blue copper(II) ions
2. copper
3. hydrogen
4. oxygen
When copper(II) sulfate solution undergoes electrolysis using copper electrodes the product at the negative cathode is? [ef26]
1. blue copper(II) ions
2. copper
3. hydrogen
4. oxygen
Which of the following statements about electrolysis is FALSE? [ef27]
1. metals or hydrogen are formed at the cathode
2. any ionic compound dissolved in water can undergo electrolysis
3. an electrolyte is a solution or melt that cannot conduct a d.c. electrical current
4. positively charged ions migrate to the negatively charged cathode
Which of the following statements about electrolysis is FALSE? [ef28]
1. metals or hydrogen are formed at the cathode
2. any ionic compound dissolved in water can undergo electrolysis
3. an electrolyte is a solution or melt that contains ions and so conducts electricity
4. positively charged ions migrate to the anode
Which of the following statements about electrolysis is FALSE? [ef29]
1. metals or hydrogen are formed at the anode
2. any ionic compound dissolved in water can undergo electrolysis
3. an electrolyte is a solution or melt that contains ions and so conducts electricity
4. negatively charged ions migrate to the anode
Which of the following statements about electrolysis is FALSE? [ef30]
1. any ionic compound dissolved in water can undergo electrolysis
2. non-metals like oxygen and chlorine are formed at the cathode
3. an electrolyte is a solution or melt that contains ions and so conducts electricity
4. negatively charged ions migrate to the anode
Which of the following statements about electrolysis is FALSE? [ef31]
1. any ionic compound dissolved in water can undergo electrolysis
2. non-metals like oxygen and chlorine are formed at the anode
3. any compound dissolved in water can readily conduct electricity and undergo electrolysis.
4. positively charged ions migrate to the cathode
Which of the following statements about electrolysis is FALSE? [ef32]
1. any ionic compound dissolved in water can undergo electrolysis
2. non-metals like oxygen and chlorine are formed at the anode
3. solid ionic compounds cannot undergo electrolysis.
4. positively charged ions migrate to the anode
What do we call the positive electrode in an electrolysis cell? [ef33]
1. anode
2. cathode
3. electrolyte
4. anion
5. cation
What do we call the negative electrode in an electrolysis cell? [ef34]
1. anode
2. cathode
3. electrolyte
4. anion
5. cation
What do we call a negatively charged ion? [ef35]
1. anode
2. cathode
3. electrolyte
4. anion
5. cation
What do we call a positively charged ion? [ef36]
1. anode
2. cathode
3. electrolyte
4. anion
5. cation

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OCR GCSE 9-1 Twenty First Century Combined Science chemistry Suite B
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