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8.3 Identification of ions by chemical and spectroscopic means

8.3 Identification of ions by chemical and spectroscopic means

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Question 13

This question is about wire insulation, recycling metals, and testing chemical compounds.

Copper is a metal widely used to make electrical wiring. These wires are often insulated using the addition polymer poly(ethene).

a.

Ethene is the monomer used to make poly(ethene). State the molecular formula of ethene, and identify the type of carbon-to-carbon bond present in ethene that is not present in poly(ethene).

[2]
b.

Suggest why poly(ethene) insulation must be removed from scrap copper wire before the copper is recycled.

[1]
c.

Describe how scrap copper can be recycled to make brand new copper products.

[1]
d.

Iron(II) sulfate (FeSO4\text{FeSO}_4FeSO4​) is an ionic compound. An aqueous solution of iron(II) sulfate contains iron(II) ions (Fe2+\text{Fe}^{2+}Fe2+) and sulfate ions (SO42−\text{SO}_4^{2-}SO42−​).

  • Describe a chemical test to show the presence of iron(II) ions (Fe2+\text{Fe}^{2+}Fe2+) in the solution. State the reagent added and the expected observation.
  • Describe a chemical test to show the presence of sulfate ions (SO42−\text{SO}_4^{2-}SO42−​) in the solution. State the reagents added and the expected observation.
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Markscheme

8.3 Identification of ions by chemical and spectroscopic means Questions

  1. GCSE
  2. /Chemistry
  3. /8.3 Identification of ions by chemical and spectroscopic means

29 exam-style questions on AQA GCSE Chemistry 8.3 Identification of ions by chemical and spectroscopic means, covering 8.3.1 Flame tests, 8.3.2 Metal hydroxides, 8.3.3 Carbonates, 8.3.4 Halides, 8.3.5 Sulfates, 8.3.6 Instrumental methods, and 8.3.7 Flame emission spectroscopy. Each one has a worked solution and a mark scheme showing where the marks go.

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