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2 marksRedox Reactions

CAPE Chemistry Unit 1 · 2005 · Paper 1 · Question 2(a)

Dry cells provide a portable source of energy. Figure 1 shows some components of a dry cell.

Referring to Figure 1, explain why the chemical reaction occurring in batteries is described as a redox reaction.

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Other parts of this question

  1. 2(b)(i)Write the balanced ionic equation for the reaction that occurs, given the half-equations: SO₂(g) + 2H₂O(l) → SO₄²⁻(aq) + 2e⁻ + 4H⁺(aq) Cr₂O₇²⁻(aq) + 6e⁻ + 14H⁺…[2 marks]
  2. 2(b)(ii)State the change in oxidation number in any ONE identified reagent in the reaction.[2 marks]
  3. 2(c)Select THREE named elements and describe an experiment, including observations, to show how the elements selected can be listed in order of oxidizing or…[4 marks]

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