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3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

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Question 15

A chemist records the mass of an open reaction tube containing potassium chlorate. The potassium chlorate is heated and decomposes to form potassium chloride and oxygen gas. The tube is allowed to cool and then weighed again.

a.

Balance the equation for this reaction.

KClO3→KCl+O2\text{KClO}_3 \rightarrow \text{KCl} + \text{O}_2KClO3​→KCl+O2​

[1]
b.

The mass of the reaction tube and its contents is lower after heating. Explain why.

[1]
Markscheme

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

95 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.

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