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Properties Of Hydrocarbons (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Properties Of Hydrocarbons' from the broader topic Organic Chemistry. The test is geared towards the AQA exam board style syllabus.
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Which statement explains why gasoline (petrol) is a mixture of hydrocarbons rather than a single compound?
Which statement best explains why hydrocarbons are generally insoluble in water?
Which test distinguishes an alkene from an alkane?
Why is catalytic cracking used in the petrochemical industry?
What is the main reason straight-chain hydrocarbons with similar molecular mass differ in viscosity?
What describes the role of a catalyst in hydrogenation of an alkene?
Which of the following best defines an alkane?
How does branching affect the melting point of hydrocarbons compared to straight chains of similar molecular mass?
What is the result when an alkane undergoes a halogenation (e.g., with chlorine) in the presence of UV light?
Why are long-chain alkanes (e.g., in fuel oil) less suitable for petrol engines than short-chain alkanes?
Which statement about the volatility of hydrocarbons in crude oil fractions is correct?