Chemistry C6

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1.Write a balanced equation to show how copper is extracted from copper oxide using carbon.
.
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2.Using the reactivity series, how can you use it to tell which metals can be extracted from their ores using reduction with carbon?
Metals below carbon in the reactivity series can be extracted by reduction using carbon e.g. zinc, iron, tin, copper
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3.Name two biological methods that can be used to extract metals from low-grade ores.
Bioleaching,phytoextraction
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4.Give an advantage and a disadvantage of using bioleaching, rather than electrolysis, to extract metals.
Advantage=simpler and cheaper to operate and maintain. Disadvantage=slow process
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5.What is a life-cycle assessment?
It looks at each stage of the life of a product
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6.Name four factors that should be considered when drawing up a life cycle assessment for a product
Choice of material,manufacture, product use, disposal
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7.Give two benefits of recycling.
Saves money, cuts down amount of rubbish that gets sent to landfill
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8.What is the purpose of fractional distillation?
To separate the different compounds of a substance
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9.Name three fractions of crude oil.
LPG, petrol, oil
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10.Do longer or shorter hydrocarbons drain out near the bottom of the fractional distillation column?
Longer hydrocarbons
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11.Why do long hydrocarbons have higher boiling points than short-chain hydrocarbons?
So they can turn into liquid quicker in order to drain out of the column early on before the shorter hydrocarbons
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12.What happens to an alkane when it's cracked?
Cracking turns long alkane molecules into smaller alkane and alkene molecules
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13.What types of molecules are produced by cracking?
Smaller alkane and alkene molecules (which are more useful)
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14.Name the gases given out by volcanoes millions of years ago.
Carbon dioxide, steam, methane, ammonia
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15.How was nitrogen gas originally put into the atmosphere?
It was formed by ammonia reacting with oxygen, and was released by denitrifying bacteria
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16.What change in the early atmosphere allowed the complex organisms to evolve?
The build-up of oxygen in the atmosphere (ozone layer) allowed evolution of more complex organisms that made use of the oxygen
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17.What causes the enhanced greenhouse effect?
If the concentration of greenhouse gases in the atmosphere increases
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18.Give three ways that we can combat global warming.
Use less fossil fuels, be more energy efficient, increase research into new energy sources
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19.Name a gas that contributes to the production of acid rain.
Sulfur dioxide
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20.Give three problems associated with acid rain.
Kills plants and animals, causes photochemical smog, damages limestone buildings
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21.Why is carbon monoxide bad for human health?
It can stop your blood from carrying oxygen around your body, which can lead to fainting
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22.Name three different sources of water that can be made potable.
Lakes, rivers, aquifers
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23.Name three processes that are used to make water potable.
Filtration, sedimentation, chlorination
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24.Name three impurities that could be present in tap water and where they come from.
Nitrate residues come from excess fertiliser 'run-off' into rivers and lakes, lead compounds come from old lead pipes, pesticide residues come from spraying pesticides too near to rivers and lakes
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Other cards in this set

Card 2

Front

2.Using the reactivity series, how can you use it to tell which metals can be extracted from their ores using reduction with carbon?

Back

Metals below carbon in the reactivity series can be extracted by reduction using carbon e.g. zinc, iron, tin, copper

Card 3

Front

3.Name two biological methods that can be used to extract metals from low-grade ores.

Back

Preview of the front of card 3

Card 4

Front

4.Give an advantage and a disadvantage of using bioleaching, rather than electrolysis, to extract metals.

Back

Preview of the front of card 4

Card 5

Front

5.What is a life-cycle assessment?

Back

Preview of the front of card 5
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