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3.3 Types of chemical reactions

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Question 33

A scientist investigates a two-stage process in which oxygen is transferred between substances. The reactions are shown in the table.

StageReaction
12CuO+C→2Cu+CO2\mathrm{2CuO + C \rightarrow 2Cu + CO_2}2CuO+C→2Cu+CO2​
22Mg+CO2→2MgO+C\mathrm{2Mg + CO_2 \rightarrow 2MgO + C}2Mg+CO2​→2MgO+C
a.

Explain which reactant is the reducing agent in each stage.

[4]
b.

All the carbon dioxide made in stage 1 is reacted in stage 2. State what happens to the carbon used in stage 1 by the end of stage 2.

[1]
Markscheme

3.3 Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Types of chemical reactions

112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.

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