O-LevelChemistryAtomic Structure5070/12 · Oct/Nov 2021 · Q71 Mark

A sample of gas is released at a particular point in a laboratory. A detecting device is placed ten metres from the point where the gas is released. This device detects and records the time when the concentration of the gas is ten molecules in every million molecules of air. The experiment is carried out with two gases at different temperatures. In which experiment was the time recorded by the detector greatest?

ASF6, 20

BSF6, 40

CCO2, 20

DCO2, 40

✓ Correct answer

A: SF6, 20

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Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 2, question 7.

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