CAIE IGCSE Chemistry 13.2.2 Plan Experiments and Investigations Questions
Work through a real CAIE IGCSE Chemistry question identifying variables that must remain constant for a fair investigation.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- plan a fair test by keeping temperature, acid volume and concentration, reactant mass or amount, and particle size or surface area controlled
CAIE IGCSE Chemistry 13.2.2 Plan Experiments and Investigations Questions question 1
[Maximum number: 3]
Ethanoic acid is a weak acid and hydrochloric acid is a strong acid.
Both ethanoic acid and hydrochloric acid dissociate in aqueous solution.
A student does experiments to show that hydrochloric acid is a strong acid and ethanoic acid is a weak acid. The student adds an excess of hydrochloric acid and an excess of ethanoic acid to separate samples of lumps of calcium carbonate.
Only the identity of the acid is changed between the experiments. All other conditions are kept the same.
The student uses the same size container and checks that the pressure is the same for each experiment.
State three other conditions which must be kept the same to ensure fair testing.
1
2
3
any three from:
- temperature
- volume (of acid)
- concentration (of acid)
- mass / amount (of CaCO3 )
- particle size / surface area (of CaCO3 )
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