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6. What is bitumen used for:
- roads
- planes
- lorries
- cars
7. Alkalies have a pH of:
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