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C8 Equilibrium Exam-Style Questions and Answers
gcse chemistry (University of Oxford)
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C8 Rates and
equilibrium
Exam-style questions
Name ...................................................................... Class .................. Date ......................
0 1 This question is about factors affecting the rate of a chemical reaction.
Draw one line connecting each factor that increases the rate of a
reaction with the fullest explanation. (3 marks)
Factor Explanation
smaller surface area
increasing solution temperature
more collisions every second
and more collisions with
enough energy to break bonds
adding a catalyst
particles have less energy
increasing gas pressure more collisions every second
more collisions with enough
energy to break bonds
0 2 This question is about the effect of concentration on the rate of a reaction.
When hydrochloric acid is added to sodium thiosulfate solution, it
slowly becomes cloudy. The time taken for a cross under the solution
to disappear can be used to monitor the rate of the reaction.
Figure 1
A student:
measured 50 cm3 of sodium thiosulfate into a flask
added 10 cm3 of dilute hydrochloric acid and started a stopwatch
stopped the clock when the cross disappeared and recorded
the time taken
repeated the experiment using different concentrations of
sodium thiosulfate.
© Oxford University Press 2017 www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original. 1
Downloaded by olinder seth ()
C8 Equilibrium Exam-Style Questions and Answers
gcse chemistry (University of Oxford)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Downloaded by olinder seth ()
, lOMoARcPSD|59658805
C8 Rates and
equilibrium
Exam-style questions
Name ...................................................................... Class .................. Date ......................
0 1 This question is about factors affecting the rate of a chemical reaction.
Draw one line connecting each factor that increases the rate of a
reaction with the fullest explanation. (3 marks)
Factor Explanation
smaller surface area
increasing solution temperature
more collisions every second
and more collisions with
enough energy to break bonds
adding a catalyst
particles have less energy
increasing gas pressure more collisions every second
more collisions with enough
energy to break bonds
0 2 This question is about the effect of concentration on the rate of a reaction.
When hydrochloric acid is added to sodium thiosulfate solution, it
slowly becomes cloudy. The time taken for a cross under the solution
to disappear can be used to monitor the rate of the reaction.
Figure 1
A student:
measured 50 cm3 of sodium thiosulfate into a flask
added 10 cm3 of dilute hydrochloric acid and started a stopwatch
stopped the clock when the cross disappeared and recorded
the time taken
repeated the experiment using different concentrations of
sodium thiosulfate.
© Oxford University Press 2017 www.oxfordsecondary.co.uk/acknowledgements
This resource sheet may have been changed from the original. 1
Downloaded by olinder seth ()
