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3.3 Types of chemical reactions

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Question 2

Three reactions in which oxygen is transferred are shown.

Equation A: 2H2+O2→2H2O\mathrm{2H_{2} + O_{2} \rightarrow 2H_{2}O}2H2​+O2​→2H2​O (hydrogen burns in oxygen)

Equation B: Mg+H2O→MgO+H2\mathrm{Mg + H_{2}O \rightarrow MgO + H_{2}}Mg+H2​O→MgO+H2​ (magnesium reacts with steam)

Equation C: CuO+H2→Cu+H2O\mathrm{CuO + H_{2} \rightarrow Cu + H_{2}O}CuO+H2​→Cu+H2​O (copper(II) oxide reacts with hydrogen)

Which substance is reduced in one of these reactions and is formed in another?

[1]
A

Water

B

Hydrogen

C

Copper

D

Copper(II) oxide

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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