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3.1 Introducing chemical reactions

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Question 17
H

Statement 1: In the ionic equation for magnesium reacting with copper(II) sulfate solution, the sulfate ions are not shown.

Statement 2: When copper is purified by electrolysis, the half equation at the cathode is Cu2++2e−→Cu\mathrm{Cu^{2+} + 2e^{-} \rightarrow Cu}Cu2++2e−→Cu.

Statement 3: When sodium chloride solution is electrolysed, the half equation at the anode is Cl2+2e−→2Cl−\mathrm{Cl_{2} + 2e^{-} \rightarrow 2Cl^{-}}Cl2​+2e−→2Cl−.

Which statements are correct?

[1]
A

1 only

B

2 and 3 only

C

1 and 2 only

D

1, 2 and 3

Markscheme

3.1 Introducing chemical reactions Questions

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

55 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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