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AQA Science B Unit 2 > 2.6 > Flashcards

2.6 Flashcards

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1
Q

renewable

A

energy generated from natural resources

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2
Q

non renewable

A

comes from sources that will run out

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3
Q

fossil fuels release what when burned?

what can this be used for?

A

release energy when burnt

•used to generate electricity for our home

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4
Q

3 fossil fuels

A

natural gas
oil
coal

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5
Q

wind

2 advantages

A

free

no pollution

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6
Q

wind

2 disadvantages

A

noise pollution

doesn’t work in calm weather/storms

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7
Q

solar

2 good

A

no pollution

useful in portable devices

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8
Q

solar

2 bad

A

nothing at night

expensive

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9
Q

hydroelectric

2 good

A

reliable

produced quickly

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10
Q

hydroelectric

2 bad

A

floods

expensive

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11
Q

wave

2 good

A

no pollution

free energy source

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12
Q

wave

2 bad

A

unreliable

produce not much energy

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13
Q

biomass

2 good

A

reliable

lots of electricity

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14
Q

biomass

bad

A

emit greenhouse gases

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15
Q

nuclear fuels produce energy from what?

A

nuclear fission

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16
Q

problems of nuclear fuels

2

A
  • disposal of waste- non renewable so must be stored safely

* radioactive emissions- harmful to life

17
Q

how is electricity distributed through the national grid via high-voltage cables:
step up transformers

A

used in power stations to produce the very high voltages needed to transmit electricity through the TNG power lines

18
Q

step down transformers

use

A

used locally to reduce the voltage to safe levels

as step up too dangerous to use

19
Q

step up

increase/decrease

A

increase

20
Q

step down increase or decrease

A

decrease

21
Q

pylons and high voltage cables

A

cancer

22
Q

radioactive emissions

A

harmful to life so waste from nuclear power stations has to be stored in a safe place until radiation falls to safe levels

23
Q

what is crude oil

A

a mixture of compounds called hydrocarbons

24
Q

complete combustion of a hydrocarbon always produces what

A

carbon dioxide + water

25
Q

what does the chemical formula CbH2n+2 mean

A

always twice plus 2 the amount of hydrogen atoms as carbon atoms

AQA Science B Unit 2 (9 decks)

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