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

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Question 21

The symbol equation for a reaction is:

___C2H6+___O2→___CO2+___H2O\_\_\_\text{C}_2\text{H}_6 + \_\_\_\text{O}_2 \rightarrow \_\_\_\text{CO}_2 + \_\_\_\text{H}_2\text{O}___C2​H6​+___O2​→___CO2​+___H2​O

a.

Give the smallest whole-number multipliers that balance the equation.

Write the numbers in the order shown.

[1]
b.

A student changes C2H6\text{C}_2\text{H}_6C2​H6​ to C2H4\text{C}_2\text{H}_4C2​H4​ to make the equation easier to balance.

Explain why the student's method is not correct.

[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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