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

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Question 40

Ethene reacts completely with oxygen in a sealed vessel. Carbon dioxide and water are the only products.

The unbalanced equation is:

C2H4+O2→CO2+H2O\text{C}_2\text{H}_4 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O}C2​H4​+O2​→CO2​+H2​O

The table shows the masses of the reactants and products.

SubstanceMass in g
Ethene2.80
Oxygen9.60
Carbon dioxide8.80
Water3.60
a.

Balance the equation for this reaction.

[1]
b.

Explain how the masses in the table support the law of conservation of mass.

[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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