O-LevelChemistryChemistry of the Environment5070/12 · May/June 2016 · Q331 Mark

The diagram shows an experiment to determine the percentage of oxygen in air. Which diagram shows the correct level of water after the candle stops burning?

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AWater level risen slightly

BWater level unchanged

CWater level risen significantly (approx 1/5 of jar)

DWater level lowered

✓ Correct answer

C: Water level risen significantly (approx 1/5 of jar)

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2016 Paper 1 Variant 2, question 33.

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