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4.2 Reactions of acids

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Question 21

A student used zinc oxide and dilute hydrochloric acid to prepare zinc chloride crystals. After heating the filtered solution, the first crystals appeared at the edges of the evaporating basin. The student collected the crystals immediately. The crystals were very small.

What should the student have done to obtain larger crystals?

[1]
A

cooled the basin quickly in iced water

B

added more zinc oxide before filtering

C

left the solution to crystallise slowly

D

heated until all of the water evaporated

Markscheme

4.2 Reactions of acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Reactions of acids

88 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.

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