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1.1 Formulae, equations and hazards

1.1 Formulae, equations and hazards

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Question 9
H

Black copper(II) oxide powder is added to warm dilute sulfuric acid. The solid disappears and a blue solution forms.

Which is the balanced ionic equation for this reaction?

[1]
A

O2−(aq)+2H+(aq)→H2O(l)\mathrm{O^{2-}(aq)} + 2\mathrm{H^{+}(aq)} \rightarrow \mathrm{H_{2}O(l)}O2−(aq)+2H+(aq)→H2​O(l)

B

H+(aq)+OH−(aq)→H2O(l)\mathrm{H^{+}(aq)} + \mathrm{OH^{-}(aq)} \rightarrow \mathrm{H_{2}O(l)}H+(aq)+OH−(aq)→H2​O(l)

C

CuO(s)+2H+(aq)→Cu(s)+H2O(l)\mathrm{CuO(s)} + 2\mathrm{H^{+}(aq)} \rightarrow \mathrm{Cu(s)} + \mathrm{H_{2}O(l)}CuO(s)+2H+(aq)→Cu(s)+H2​O(l)

D

CuO(s)+2H+(aq)→Cu2+(aq)+H2O(l)\mathrm{CuO(s)} + 2\mathrm{H^{+}(aq)} \rightarrow \mathrm{Cu^{2+}(aq)} + \mathrm{H_{2}O(l)}CuO(s)+2H+(aq)→Cu2+(aq)+H2​O(l)

Markscheme

1.1 Formulae, equations and hazards Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 Formulae, equations and hazards

230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.

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