AQA GCSE Combined Science Trilogy -
Chemistry - Paper 2 Exam Questions and
Answers Graded A+
pure substance - Correct answer-single element, compound or substance not mixed
with another substance
physical processes - Correct answer-mixtures can be separated by...
simple distillation - Correct answer-evaporating water and condensing it in a
separate container
fractional distillation - Correct answer-evaporating liquids with different boiling
points
filtration - Correct answer-screening and sieving to remove solids
chromatography - Correct answer-using a solvent to separate pigments so you can
identify them
crystallisation - Correct answer-evaporating a solution to a small volume and
leaving it to cool to form crystals
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,chemically bonded - Correct answer-a mixture is made from different substances
that aren't...
a mixture designed for a use - Correct answer-a formulation is...
mixing components in carefully measured amounts - Correct answer-a formulation
is made by...
the solvent moves through the paper - Correct answer-in paper chromatography...
different compounds to different distances depending on their attraction to the
paper and solvent - Correct answer-chromatography carries...
distance moved by compound ÷ distance moved by solvent - Correct answer-Rf
value =
single spot in all solvents - Correct answer-in chromatography, a pure compound
produces a...
damp blue litmus paper red and then bleaches it white - Correct answer-chlorine
turns...
glowing splint relight - Correct answer-oxygen gas test makes a...
squeaky pop sound - Correct answer-hydrogen gas test makes a...
limewater go cloudy - Correct answer-carbon dioxide gas test makes...
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,warmth, shelter, food and transport - Correct answer-the Earth provides humans
with...
food, timber, clothing and fuels - Correct answer-natural resources along with
agriculture give us...
processes to make energy and materials - Correct answer-finite resources involve...
there is only a certain amount of them - Correct answer-finite means...
using the Earth's resources in a way that can continue in the future. - Correct
answer-sustainable resources involves...
meet the needs of people today without impacting on the needs of people in the
future - Correct answer-sustainable development should...
safe to drink - Correct answer-potable water is...
dissolved salts and microbes - Correct answer-potable water has a low enough
level of...
pure water - Correct answer-potable water isn't...
no other substances - Correct answer-pure water contains...
dissolved salts behind - Correct answer-testing water purity using evaporation:
evaporating water will leave...
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, solid residue will be left - Correct answer-testing water purity using evaporation:
the purer the water, the less...
100°C - Correct answer-testing water purity using boiling point: pure water will
boil at...
0°C - Correct answer-testing water purity using boiling point: pure water will melt
at...
agricultural and industrial processes - Correct answer-chemistry is important in
research to improve...
treat water and make it potable - Correct answer-sterilising agents are used to...
rain water with low amounts of dissolved substances - Correct answer-ground
water is...
ground water - Correct answer-most potable water in the UK is from...
choosing a source, filtering and sterilising the water - Correct answer-potable water
is produced by:
desalination may be used - Correct answer-if fresh water supplies are limited...
removing salt from sea water - Correct answer-desalination involves...
reverse osmosis or distillation - Correct answer-water can be desalinated using...
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Chemistry - Paper 2 Exam Questions and
Answers Graded A+
pure substance - Correct answer-single element, compound or substance not mixed
with another substance
physical processes - Correct answer-mixtures can be separated by...
simple distillation - Correct answer-evaporating water and condensing it in a
separate container
fractional distillation - Correct answer-evaporating liquids with different boiling
points
filtration - Correct answer-screening and sieving to remove solids
chromatography - Correct answer-using a solvent to separate pigments so you can
identify them
crystallisation - Correct answer-evaporating a solution to a small volume and
leaving it to cool to form crystals
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,chemically bonded - Correct answer-a mixture is made from different substances
that aren't...
a mixture designed for a use - Correct answer-a formulation is...
mixing components in carefully measured amounts - Correct answer-a formulation
is made by...
the solvent moves through the paper - Correct answer-in paper chromatography...
different compounds to different distances depending on their attraction to the
paper and solvent - Correct answer-chromatography carries...
distance moved by compound ÷ distance moved by solvent - Correct answer-Rf
value =
single spot in all solvents - Correct answer-in chromatography, a pure compound
produces a...
damp blue litmus paper red and then bleaches it white - Correct answer-chlorine
turns...
glowing splint relight - Correct answer-oxygen gas test makes a...
squeaky pop sound - Correct answer-hydrogen gas test makes a...
limewater go cloudy - Correct answer-carbon dioxide gas test makes...
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
,warmth, shelter, food and transport - Correct answer-the Earth provides humans
with...
food, timber, clothing and fuels - Correct answer-natural resources along with
agriculture give us...
processes to make energy and materials - Correct answer-finite resources involve...
there is only a certain amount of them - Correct answer-finite means...
using the Earth's resources in a way that can continue in the future. - Correct
answer-sustainable resources involves...
meet the needs of people today without impacting on the needs of people in the
future - Correct answer-sustainable development should...
safe to drink - Correct answer-potable water is...
dissolved salts and microbes - Correct answer-potable water has a low enough
level of...
pure water - Correct answer-potable water isn't...
no other substances - Correct answer-pure water contains...
dissolved salts behind - Correct answer-testing water purity using evaporation:
evaporating water will leave...
©COPYRIGHT 2025, ALL RIGHTS RESERVED 3
, solid residue will be left - Correct answer-testing water purity using evaporation:
the purer the water, the less...
100°C - Correct answer-testing water purity using boiling point: pure water will
boil at...
0°C - Correct answer-testing water purity using boiling point: pure water will melt
at...
agricultural and industrial processes - Correct answer-chemistry is important in
research to improve...
treat water and make it potable - Correct answer-sterilising agents are used to...
rain water with low amounts of dissolved substances - Correct answer-ground
water is...
ground water - Correct answer-most potable water in the UK is from...
choosing a source, filtering and sterilising the water - Correct answer-potable water
is produced by:
desalination may be used - Correct answer-if fresh water supplies are limited...
removing salt from sea water - Correct answer-desalination involves...
reverse osmosis or distillation - Correct answer-water can be desalinated using...
©COPYRIGHT 2025, ALL RIGHTS RESERVED 4
