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6.1 Rate of reaction

6.1 Rate of reaction

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Question 3
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A student investigated the rate of decomposition of hydrogen peroxide, catalysed by manganese(IV) oxide.

The equation for the reaction is:

2H2O2(aq)→2H2O(l)+O2(g) 2\text{H}_2\text{O}_2\text{(aq)} \rightarrow 2\text{H}_2\text{O(l)} + \text{O}_2\text{(g)} 2H2​O2​(aq)→2H2​O(l)+O2​(g)
a.

Which state symbol in this equation represents a substance dissolved in water, rather than one of the three primary states of matter?

[1]
b.

What two pieces of measuring apparatus could the student use to find the rate of production of oxygen gas?

[2]
c.

The table below shows the results of the investigation:

Time in s\text{s}sVolume of oxygen gas collected in cm3\text{cm}^3cm3
00
1536
3058
4570
6076
7578
9078

Give three conclusions that can be drawn about the rate of reaction from this data.

[3]
d.

The student repeated the investigation using a more concentrated solution of hydrogen peroxide. All other variables (such as the volume of solution and mass of catalyst) were kept the same. Which two of the following statements are correct?

  • More oxygen gas was produced in the first 15 seconds.
  • The activation energy for the reaction was lowered.
  • The hydrogen peroxide was depleted more rapidly.
  • The reaction finished at exactly the same time.
  • The total volume of gas collected at the end was less.
[2]
Markscheme

6.1 Rate of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /6.1 Rate of reaction

26 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1 Calculating rates of reactions, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.

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