DP Chemistry (last assessment 2024)

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Question 19N.3.hl.TZ0.b(ii)

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.hl.TZ0.b(ii)
Level hl Paper 3 Time zone TZ0
Command term Suggest Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 1]
19N.3.hl.TZ0.b(ii)

A proton-exchange membrane (PEM) fuel cell uses pure hydrogen gas as the fuel and a proton exchange membrane as the electrolyte.

 

Suggest how PEM fuel cells can be used to produce a larger voltage than that calculated in (b)(i).

[1]

Markscheme

connect several fuel cells in series
OR
increase pressure/concentration of reactant/hydrogen/oxygen ✔

NOTE: Do not accept changes in [H+]/pH as they do not affect cell potential in this case.
Do not accept reference to quantity for “concentration”.

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