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3.1 Introducing chemical reactions

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Question 5

Iron, Fe(s)\mathrm{Fe(s)}Fe(s), is added to a solution containing iron(III) ions, Fe3+(aq)\mathrm{Fe^{3+}(aq)}Fe3+(aq). The iron atoms form iron(II) ions, Fe2+(aq)\mathrm{Fe^{2+}(aq)}Fe2+(aq).

What is the balanced ionic equation for this reaction?

[1]
A

Fe(s)+Fe3+(aq)→2Fe2+(aq)\mathrm{Fe(s) + Fe^{3+}(aq) \rightarrow 2Fe^{2+}(aq)}Fe(s)+Fe3+(aq)→2Fe2+(aq)

B

2Fe(s)+3Fe3+(aq)→5Fe2+(aq)\mathrm{2Fe(s) + 3Fe^{3+}(aq) \rightarrow 5Fe^{2+}(aq)}2Fe(s)+3Fe3+(aq)→5Fe2+(aq)

C

Fe(s)+2Fe3+(aq)→3Fe2+(aq)\mathrm{Fe(s) + 2Fe^{3+}(aq) \rightarrow 3Fe^{2+}(aq)}Fe(s)+2Fe3+(aq)→3Fe2+(aq)

D

Fe(s)+3Fe3+(aq)→4Fe2+(aq)\mathrm{Fe(s) + 3Fe^{3+}(aq) \rightarrow 4Fe^{2+}(aq)}Fe(s)+3Fe3+(aq)→4Fe2+(aq)

Markscheme

3.1 Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Introducing chemical reactions

134 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

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