Chemistry Paper 1

Question 1

Describe how a hydrogen fuel cell produces a potential difference.

Answer 1

Hydrogen is oxidised electrochemically to lose electrons
to produce water

Question 2

Energy change between metal and salt solution experiment graph

Answer 2

Straight line increasing
Straight line with a shallower gradient
Two lines intersect and continue past intersection

Question 3

Comparison question (4 marks)

Answer 3

At least two similarities and two differences