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3.3 Types of chemical reactions

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Question 15

A reaction between iron(II) ions and cobalt(III) ions is represented by this incomplete equation.

2Fe2++□Co3+→2Fe3++□Co2+ \mathrm{2Fe^{2+} + \Box Co^{3+} \rightarrow 2Fe^{3+} + \Box Co^{2+}} 2Fe2++□Co3+→2Fe3++□Co2+
a.

Calculate the number of electrons lost by the iron(II) ions shown in the equation.

[1]
b.

Calculate the coefficients needed to complete the equation and explain how electron transfer determines them.

[2]
Markscheme

3.3 Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Types of chemical reactions

112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.

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