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3.1 Introducing chemical reactions

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Question 11

Copper carbonate forms copper oxide and carbon dioxide when it decomposes. A 5.0 g sample of copper carbonate gives 3.2 g of copper oxide after complete decomposition.

A laboratory technician places 15.0 g of copper carbonate in an open boiling tube. After a short period of heating, the solid mixture has a mass of 12.3 g and still contains some copper carbonate.

What mass of copper oxide has been made?

[1]
A

7.5 g

B

4.8 g

C

9.6 g

D

2.7 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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