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

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Question 6

A manufacturer heats 25.0 kg of a solid compound in an open kiln. The compound decomposes completely to form a solid product and a gaseous product.

The mass of solid product is 18.4 kg. An extraction system collects 5.9 kg of the gaseous product.

a.

Calculate the mass of gaseous product that was not collected by the extraction system.

[2]
b.

The manufacturer adds the mass of the solid product to the mass of the collected gas and concludes that mass was not conserved.

Explain why this conclusion is incorrect.

[2]
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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