A laboratory compares two hydrocarbon samples. Sample P ignites more easily than sample Q.
Which conclusion about the relative molecular sizes of the samples is supported by these observations?
The samples have molecules of the same size.
The relative sizes of the molecules cannot be inferred from how easily they ignite.
Sample P has larger molecules than sample Q.
Sample P has smaller molecules than sample Q.
91 exam-style questions on AQA GCSE Chemistry 7.1 Carbon compounds as fuels and feedstock, covering 7.1.1 Crude oil, hydrocarbons and alkanes, 7.1.2 Fractional distillation and petrochemicals, 7.1.3 Properties of hydrocarbons, and 7.1.4 Cracking and alkenes. Each one has a worked solution and a mark scheme showing where the marks go.