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Electrode potentials and electrochemical cells (A-level only)

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Question 10

This question is about a methanol–oxygen fuel cell. When the cell operates, the methanol (CH3OH\text{CH}_3\text{OH}CH3​OH) molecules react with water at the negative electrode to form carbon dioxide and hydrogen ions. Oxygen gas reacts with hydrogen ions to form water at the positive electrode.

1.

Deduce the half-equation for the reaction at the negative electrode.

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2.

Deduce the half-equation for the reaction at the positive electrode.

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3.

Give the equation for the overall reaction that occurs in the methanol–oxygen fuel cell.

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4.

The negative electrode is made of carbon and the positive electrode is made of platinum. Give the conventional representation for this fuel cell.

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5.

State what must be done to maintain the EMF of this fuel cell when in use.

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Markscheme

Electrode potentials and electrochemical cells (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Electrode potentials and electrochemical cells (A-level only)

34 exam-style questions on AQA A Level Chemistry Electrode potentials and electrochemical cells (A-level only), covering Electrode potentials and cells (A-level only) and Commercial applications of electrochemical cells (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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