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6. What is bitumen used for:

  • roads
  • planes
  • lorries
  • cars

7. Alkalies have a pH of:

  • 7
  • 8-14
  • 0-6

8. Acids have a pH of:

  • 7
  • 0-6
  • 8-14

9. What is petrol used for:

  • cars
  • planes
  • lorries/trains
  • gas canisters

10. What metals are separated from their ores using heating with carbon:

  • carbon
  • zinc, iron, tin, lead, copper
  • potassium, sodium, calcium, magnesium and aluminium

11. Disadvantages of quarrying limestone:

  • permanently changes landscape, noisy and dusty, destroys habitats, transportation means noise and pollution.
  • jobs.
  • useful.

12. Why are alloys stronger:

  • the layers don't slide because the particles have more friction
  • the layers don't slide as the particles are different sizes
  • the layers slide and so last longer

13. What are the dangers of acidic rain:

  • it should be obvious from these answers
  • damages carbonate rocks and increases the acidity of rivers/lakes
  • i can't be bothered to think of an incorrect answer
  • pick the science-y one

14. CO2 increased by:

  • photosynthesis, dissolving in oceans, sedimentary rocks.
  • photosynthesis, volcanoes, sedimentary rocks.
  • photosynthesis, dissolving in oceans, volcanoes.

15. Examples of shape memory alloys:

  • tools
  • medical stents and glasses
  • parts on a car

16. In complete combustion, hydrocarbons burn to produce:

  • carbon dioxide and water
  • carbon dioxide and methane
  • oxygen and water
  • carbon dioxide and oxygen

17. Why is putting polymers in landfill sites a bad thing:

  • costs money
  • they are non-biodegradable
  • we can't reuse them

18. Why is recycling polymers expensive:

  • they need to be sorted which takes time
  • its boring

19. The earths early atmosphere

  • Formed by volcanoes, mostly co2, small amounts of ammonia, hydrogen, water vapour and methane.
  • Formed by photosynthesis, mostly co2, little or no oxygen.
  • Formed by volcanoes, mostly co2 but some oxygen.

20. What are alkenes:

  • fully saturated hydrocarbons that are reactive
  • fully saturated hydrocarbons that are unreactive
  • unsaturated hydrocarbons with a double bond and so reactive
  • unsaturated hydrocarbons with a double bond and so unreactive