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3.1 Introducing chemical reactions

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Question 2

Aluminium reacts with oxygen to form aluminium oxide. The formulae are shown in the unbalanced equation: Al+O2→Al2O3\mathrm{Al + O_{2} \rightarrow Al_{2}O_{3}}Al+O2​→Al2​O3​.

Which equation shows this reaction with the smallest whole-number balancing numbers?

[1]
A

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

B

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

C

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

D

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

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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