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

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Question 15
H

Sodium hydrogencarbonate decomposes when it is heated in an open test tube.

2NaHCO3→Na2CO3+H2O+CO22\text{NaHCO}_3 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_22NaHCO3​→Na2​CO3​+H2​O+CO2​

Which statement explains the change in the mass of the solid in the test tube?

[1]
A

The mass increases because carbon dioxide is added to the solid.

B

The mass increases because water vapour condenses in the tube.

C

The mass decreases because water vapour and carbon dioxide escape.

D

The mass decreases because sodium carbonate escapes as a gas.

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

40 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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