Combined Science Trilogy - Chemistry - Paper 2(AQA GCSE) Latest Exam And All Verified Answers.
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Course
Combined Science
Institution
Combined Science
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 e...
Combined Science Trilogy - Chemistry -
Paper 2(AQA GCSE) Latest Exam And All
Verified Answers.
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...
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