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