O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2015 · Q41 Mark

Two containers, one of methane and one of butane, are placed at the same distance from a naked flame. Both gases are released at the same time. The methane gas reaches the flame and catches fire before the butane gas reaches the flame. Which statement explains this?

AEach methane molecule has a higher proportion of hydrogen than each butane molecule.

BMethane does not have isomers, butane does have isomers.

CMethane has a higher boiling point than butane.

DMethane molecules have a smaller mass than butane molecules.

✓ Correct answer

D: Methane molecules have a smaller mass than butane molecules.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2015 Paper 1 Variant 1, question 4.

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