Calculating and explaining energy change

Question 1

What type of energy is released by hydrogen fuel cells? [1]

Answer 1

electrical

Question 2

Suggest two reasons why the UK government might encourage the building of more hydrogen filling stations. [2]

Answer 2

• using hydrogen saves petrol / diesel / crude oil

- using hydrogen does not cause pollution

Question 3

The reaction is exothermic. Explain why, in terms of bonds broken and bonds formed. [2]

Answer 3

energy released when bonds form is greater than energy used when bonds get broken