Practical Methods: Rates of Reaction
Cambridge IGCSE Chemistry 0620 — Sections A, B & C
📋 Instructions
Answer each question, then click Reveal Answer to check. Use Mark Myself to track your score. Click Calculate My Score at the end.
Apparatus Naming
Name the piece of apparatus shown below, used to collect and measure the volume of gas produced in a reaction.
The diagram below shows apparatus used to measure the volume of gas by water displacement. Name the labelled parts X and Y.
Name the apparatus shown, used to measure a precise volume of acid for a titration experiment involving rates of reaction.
The apparatus below is set up to measure the rate of reaction between calcium carbonate and hydrochloric acid using the mass loss method. Name the labelled apparatus P and Q.
Name the piece of apparatus shown, used to accurately measure 25.0 cm³ of sodium thiosulfate solution for a clock reaction experiment.
Method Evaluation
In the mass loss experiment (marble chips + hydrochloric acid), why is cotton wool placed in the neck of the conical flask?
Why is the mass loss method NOT suitable for measuring the rate of a reaction that produces hydrogen gas?
A student investigates the rate of reaction between sodium thiosulfate and hydrochloric acid using the 'disappearing cross' method. State ONE limitation of this method.
In a gas syringe experiment measuring rate of reaction, why should the total volume of the reaction mixture be kept the same in each experiment?
A student used large marble chips in one experiment and powdered marble in another, keeping all other variables constant. Explain why the powdered marble reacted faster.
Designing an Experiment
Describe how you would investigate the effect of TEMPERATURE on the rate of reaction between marble chips (calcium carbonate) and hydrochloric acid, using a gas syringe to measure gas volume.
A student wants to investigate how CONCENTRATION of hydrochloric acid affects the rate of the reaction with sodium thiosulfate (disappearing cross method). Write a plan including variables and how results would be processed.
Describe how you would use a catalyst to investigate its effect on the decomposition of hydrogen peroxide. Include how you would measure the rate and what you would keep constant.
In an experiment investigating surface area and rate of reaction, a student used large marble chips, small marble chips, and powdered marble with excess hydrochloric acid. State the independent variable, dependent variable, and TWO controlled variables.
A student records the following data from a gas syringe experiment (marble chips + HCl acid at 25°C): 0s=0cm³, 30s=18cm³, 60s=32cm³, 90s=42cm³, 120s=48cm³, 150s=51cm³, 180s=51cm³. (a) What is the total volume of gas collected? (b) Why does the gas volume stop increasing after 150s? (c) Calculate the mean rate of reaction over the FIRST 60 seconds. Give units.
Cambridge IGCSE Chemistry 0620 (2026–2028) · Topic 6.2.6 · Paper 6 Focus
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