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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 11

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

Aluminum is a metal widely used to make overhead power cables. These cables are sometimes insulated using the addition polymer poly(propene).

a.

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

[2]
b.

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

[1]
c.

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

[2]
d.

Iron(III) chloride (FeCl3\text{FeCl}_3FeCl3​) is an ionic compound. An aqueous solution of iron(III) chloride contains iron(III) ions (Fe3+\text{Fe}^{3+}Fe3+) and chloride ions (Cl−\text{Cl}^-Cl−).

  • Describe a chemical test to show the presence of iron(III) ions (Fe3+\text{Fe}^{3+}Fe3+) in the solution. State the reagent added and the expected observation.
  • Describe a chemical test to show the presence of chloride ions (Cl−\text{Cl}^-Cl−) 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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