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3.1 Introducing chemical reactions

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Question 26

Aluminium powder reacts with oxygen when it is heated.

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

A technician carries out two experiments in open crucibles. No solid escapes from either crucible.

ExperimentMass of aluminium before heating (g)Mass of solid after heating (g)
Aluminium reacts completely5.410.2
Heating is stopped while some aluminium remains18.024.4

What mass of aluminium oxide has formed in the second experiment?

[1]
A

13.6 g

B

24.4 g

C

7.2 g

D

6.4 g

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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