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3.1 Introducing chemical reactions

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Question 32

A technician is preparing a label for a container of iron(III) sulfate.

The table shows the ions in iron(III) sulfate.

IonFormula and charge
iron(III)Fe3+\text{Fe}^{3+}Fe3+
sulfateSO42−\text{SO}_4^{2-}SO42−​
a.

Give the formula of iron(III) sulfate.

[1]
b.

Explain why the formula of iron(III) sulfate has no overall charge.

[2]
c.

The technician's notes state that one formula unit of iron(III) sulfate contains 15 atoms.

Evaluate this statement.

[2]
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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