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3.1 Introducing chemical reactions

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Question 15
H

A student adds zinc to an excess of dilute hydrochloric acid in an open flask on a balance.

Zn+2HCl→ZnCl2+H2 \mathrm{Zn + 2HCl \rightarrow ZnCl_{2} + H_{2}} Zn+2HCl→ZnCl2​+H2​

When the reaction has finished, the mass of the flask and its contents has decreased by 0.10 g.

Relative atomic mass (ArA_rAr​): H = 1.0 Zn = 65.4

What mass of zinc reacted?

[1]
A

0.10 g

B

1.64 g

C

3.27 g

D

6.54 g

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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