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4.2 Reactions of acids

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Question 1
H

Zinc reacts with dilute sulfuric acid. Two equations for the reaction are shown.

Zn(s)+H2SO4(aq)→ZnSO4(aq)+H2(g)\text{Zn(s)} + \text{H}_2\text{SO}_4\text{(aq)} \rightarrow \text{ZnSO}_4\text{(aq)} + \text{H}_2\text{(g)}Zn(s)+H2​SO4​(aq)→ZnSO4​(aq)+H2​(g)

Zn(s)+2H+(aq)→Zn2+(aq)+H2(g)\text{Zn(s)} + 2\text{H}^+\text{(aq)} \rightarrow \text{Zn}^{2+}\text{(aq)} + \text{H}_2\text{(g)}Zn(s)+2H+(aq)→Zn2+(aq)+H2​(g)

a.

Name the species that is oxidised in this reaction. Explain your answer.

[2]
b.

Explain, in terms of electrons, why the hydrogen ions are reduced in this reaction.

[1]
c.

Write the half equation for the reduction that takes place.

[1]
d.

The sulfate ions are neither oxidised nor reduced in this reaction. Explain why.

[1]
Markscheme

4.2 Reactions of acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Reactions of acids

40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.

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