2.6 Flashcards Preview

AQA Science B Unit 2 > 2.6 > Flashcards

Flashcards in 2.6 Deck (25):
1

renewable

energy generated from natural resources

2

non renewable

comes from sources that will run out

3

fossil fuels release what when burned?
what can this be used for?

release energy when burnt
•used to generate electricity for our home

4

3 fossil fuels

natural gas
oil
coal

5

wind
2 advantages

free
no pollution

6

wind
2 disadvantages

noise pollution
doesn't work in calm weather/storms

7

solar
2 good

no pollution
useful in portable devices

8

solar
2 bad

nothing at night
expensive

9

hydroelectric
2 good

reliable
produced quickly

10

hydroelectric
2 bad

floods
expensive

11

wave
2 good

no pollution
free energy source

12

wave
2 bad

unreliable
produce not much energy

13

biomass
2 good

reliable
lots of electricity

14

biomass
bad

emit greenhouse gases

15

nuclear fuels produce energy from what?

nuclear fission

16

problems of nuclear fuels
(2)

•disposal of waste- non renewable so must be stored safely
•radioactive emissions- harmful to life

17

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

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

18

step down transformers
use

used locally to reduce the voltage to safe levels
(as step up too dangerous to use)

19

step up
increase/decrease

increase

20

step down increase or decrease

decrease

21

pylons and high voltage cables

cancer

22

radioactive emissions

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

23

what is crude oil

a mixture of compounds called hydrocarbons

24

complete combustion of a hydrocarbon always produces what

carbon dioxide + water

25

what does the chemical formula CbH2n+2 mean

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