Chapter 8.4 hydrogen oxygen fuel cell

Question 1

What is a hydrogen-oxygen fuel cell

formula

Answer 1

Uses hydrogen and oxygen to produce electricity. Only chemical product is water.

2 H2 + O2 –> 2 H20 + electrical energy + thermal energy

Question 2

What happens to the water and heat

Answer 2

Flows out in the form of water vapour along with the unused air

Some of the heat can be used to heat the inside of the vehicle

Question 3

Adv of a hydrogen-oxygen fuel cell

Answer 3

Only chem product is water - harmless
Hydrogen can be made by the electrolysis of water (which is very abundant)

Question 4

Disadv of a hydrogen-oxygen fuel cell

Answer 4

Hydrogen has to be stored as a liquid under high pressure to make it practical to use since it is a gas.

Hydrogen filling stations aren’t widely available

Question 5

Adv of petrol

Answer 5

Petrol filling stations are widely available
Relatively cheap

Question 6

Disadv of petrol

Answer 6

Burning petrol produces harmful substances such as Carbon dioxide, oxides of nitrogen, deadly carbon monoxide

Petrol is obtained from oil - non-renewable resource