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3.1 Introducing chemical reactions

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Question 27
H

A student mixes 6.0 g of hydrogen with 32.0 g of oxygen and ignites the mixture.

2H2+O2→2H2O \mathrm{2H_{2} + O_{2} \rightarrow 2H_{2}O} 2H2​+O2​→2H2​O

Relative atomic mass (ArA_rAr​): H = 1.0 O = 16.0

Which option gives the maximum mass of water made and the reactant left over?

[1]
A

36.0 g of water; hydrogen is left over

B

38.0 g of water; nothing is left over

C

54.0 g of water; oxygen is left over

D

18.0 g of water; hydrogen is left over

Markscheme

3.1 Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Introducing chemical reactions

55 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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