Experiments to measure the rate of reaction
2 marks · NormalState two different ways to measure the rate of the reaction between marble chips and dilute hydrochloric acid in a laboratory experiment.
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Also accept: measuring the decrease in mass using a balance; measuring the volume of carbon dioxide produced using a gas syringe; measuring the volume of gas collected in an upside-down measuring cylinder
Common mistakes: measuring the decrease in temperature
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Marking points
B1 · 1 mark · States a valid method to measure rate: e.g., loss of mass using a balance
B2 · 1 mark · States a second valid method to measure rate: e.g., volume of CO2 produced using a gas syringe or measuring cylinder
Worked solution
1. Measure the loss of mass over time using a balance. 2. Measure the volume of carbon dioxide gas produced using a gas syringe or an inverted measuring cylinder.