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3.1 Introducing chemical reactions

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Question 16

Propane burns completely in oxygen to form carbon dioxide and water.

C3H8+xO2→3CO2+4H2O \mathrm{C_{3}H_{8} + \mathit{x}O_{2} \rightarrow 3CO_{2} + 4H_{2}O} C3​H8​+xO2​→3CO2​+4H2​O

Which number must replace x x\,x for the equation to be balanced?

[1]
A

7

B

10

C

4

D

5

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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