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3.1 Introducing chemical reactions

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Question 5

During a laboratory demonstration, aluminium metal is heated in oxygen gas. The ionic solid produced has a lattice containing Al3+\mathrm{Al^{3+}}Al3+ and O2−\mathrm{O^{2-}}O2− ions.

Which equation correctly represents this reaction?

[1]
A

2Al+3O→Al2O3\mathrm{2Al + 3O \rightarrow Al_{2}O_{3}}2Al+3O→Al2​O3​

B

2Al+3O2→2Al2O3\mathrm{2Al + 3O_{2} \rightarrow 2Al_{2}O_{3}}2Al+3O2​→2Al2​O3​

C

4Al+3O2→2Al2O3\mathrm{4Al + 3O_{2} \rightarrow 2Al_{2}O_{3}}4Al+3O2​→2Al2​O3​

D

Al+O2→AlO2\mathrm{Al + O_{2} \rightarrow AlO_{2}}Al+O2​→AlO2​

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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