AQA GCSE COMBINED SCIENCE TRILOGY - CHEMISTRY - PAPER 2

AQA GCSE COMBINED SCIENCE
TRILOGY - CHEMISTRY - PAPER 2
1. pure substance - CORRECT ANSWER -single element, compound or substance not
mixed with another substance



2. physical processes - CORRECT ANSWER -mixtures can be separated by...



3. simple distillation - CORRECT ANSWER -evaporating water and condensing it in a
separate container



4. fractional distillation - CORRECT ANSWER -evaporating liquids with different boiling
points



5. filtration - CORRECT ANSWER -screening and sieving to remove solids



6. chromatography - CORRECT ANSWER -using a solvent to separate pigments so you
can identify them



7. crystallisation - CORRECT ANSWER -evaporating a solution to a small volume and
leaving it to cool to form crystals



8. chemically bonded - CORRECT ANSWER -a mixture is made from different substances
that aren't...



9. a mixture designed for a use - CORRECT ANSWER -a formulation is...

,10. mixing components in carefully measured amounts - CORRECT ANSWER -a
formulation is made by...



11. the solvent moves through the paper - CORRECT ANSWER -in paper
chromatography...



12. different compounds to different distances depending on their attraction to the
paper and solvent - CORRECT ANSWER -chromatography carries...



13. distance moved by compound ÷ distance moved by solvent - CORRECT ANSWER -Rf
value =



14. single spot in all solvents - CORRECT ANSWER -in chromatography, a pure compound
produces a...



15. damp blue litmus paper red and then bleaches it white - CORRECT ANSWER -chlorine
turns...



16. glowing splint relight - CORRECT ANSWER -oxygen gas test makes a...



17. squeaky pop sound - CORRECT ANSWER -hydrogen gas test makes a...



18. limewater go cloudy - CORRECT ANSWER -carbon dioxide gas test makes...



19. warmth, shelter, food and transport - CORRECT ANSWER -the Earth provides humans
with...

,20. food, timber, clothing and fuels - CORRECT ANSWER -natural resources along with
agriculture give us...



21. processes to make energy and materials - CORRECT ANSWER -finite resources
involve...



22. there is only a certain amount of them - CORRECT ANSWER -finite means...



23. using the Earth's resources in a way that can continue in the future. - CORRECT
ANSWER -sustainable resources involves...



24. meet the needs of people today without impacting on the needs of people in the
future - CORRECT ANSWER -sustainable development should...



25. safe to drink - CORRECT ANSWER -potable water is...



26. dissolved salts and microbes - CORRECT ANSWER -potable water has a low enough
level of...



27. pure water - CORRECT ANSWER -potable water isn't...



28. no other substances - CORRECT ANSWER -pure water contains...



29. dissolved salts behind - CORRECT ANSWER -testing water purity using evaporation:
evaporating water will leave...



30. solid residue will be left - CORRECT ANSWER -testing water purity using evaporation:
the purer the water, the less...

, 31. 100°C - CORRECT ANSWER -testing water purity using boiling point: pure water will
boil at...



32. 0°C - CORRECT ANSWER -testing water purity using boiling point: pure water will melt
at...



33. agricultural and industrial processes - CORRECT ANSWER -chemistry is important in
research to improve...



34. treat water and make it potable - CORRECT ANSWER -sterilising agents are used to...



35. rain water with low amounts of dissolved substances - CORRECT ANSWER -ground
water is...



36. ground water - CORRECT ANSWER -most potable water in the UK is from...



37. choosing a source, filtering and sterilising the water - CORRECT ANSWER -potable
water is produced by:



38. desalination may be used - CORRECT ANSWER -if fresh water supplies are limited...



39. removing salt from sea water - CORRECT ANSWER -desalination involves...



40. reverse osmosis or distillation - CORRECT ANSWER -water can be desalinated using...



41. lots of energy - CORRECT ANSWER -water desalination requires...