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6.1 Rate of reaction

6.1 Rate of reaction

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Question 18

A student investigated the rate of the reaction between calcium carbonate chips and dilute hydrochloric acid.

The equation for the reaction is:

CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g) \text{CaCO}_3\text{(s)} + 2\text{HCl(aq)} \rightarrow \text{CaCl}_2\text{(aq)} + \text{H}_2\text{O(l)} + \text{CO}_2\text{(g)} CaCO3​(s)+2HCl(aq)→CaCl2​(aq)+H2​O(l)+CO2​(g)
a.

Which state symbol in this equation does not represent one of the three states of matter?

[1]
b.

What two pieces of measuring apparatus could the student use to find the rate of mass loss of the reaction mixture as the carbon dioxide gas escapes?

[2]
c.

The table below shows the results of the investigation:

Time in s\text{s}sMass of flask and contents in g\text{g}g
0200.00
20197.60
40195.90
60194.80
80194.10
100193.70
120193.50
140193.50

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

[3]
d.

The student repeated the investigation using the same mass of calcium carbonate, but as a fine powder rather than medium-sized chips. All other variables were kept the same. Which two of the following statements are correct?

  • More mass was lost in the first 20 seconds.
  • The activation energy for the reaction was lower.
  • The calcium carbonate was used up more quickly.
  • The reaction finished at the same time.
  • The total mass of gas lost was greater.
[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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