Experiments to measure the rate of reaction
3 marks · EasyA student performs an experiment to investigate how a catalyst affects the rate of decomposition of hydrogen peroxide solution. The student uses different solids as possible catalysts.
State the name of the gas collected during the decomposition of hydrogen peroxide.
Give one method by which the rate of gas production can be measured in this experiment.
Suggest why different solids may produce different rates of reaction.
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(a) oxygen · must show oxygen, O2
(b) Measure volume of gas collected in a gas syringe; count the bubbles formed per unit time; measure loss of mass.
(c) Different solids may have different catalytic effects or surface areas, affecting how quickly hydrogen peroxide decomposes.
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Marking points
B1 (a) · 1 mark · States 'oxygen' (or O2) as the gas collected.
B1 (b) · 1 mark · Gives an appropriate gas measurement method (gas syringe, bubbles per time, loss of mass).
B1 (c) · 1 mark · States that different solids may have different catalytic activities or surface areas.
Worked solution
a) Oxygen is collected. b) The rate can be measured by collecting the gas in a syringe or measuring cylinder, or by counting bubbles per minute, or measuring decrease in mass. c) Different solids may have different catalytic abilities or different surface areas.