Organic Chemistry Exam Questions
Questions on crude oil, hydrocarbons, alkanes, fractional distillation, cracking, alkenes, alcohols, carboxylic acids, and polymers (addition and condensation). Download free past paper questions organised by topic with mark schemes.
Frequently Asked Questions
What are alkanes and alkenes GCSE?
Alkanes are saturated hydrocarbons (single C-C bonds): methane, ethane, propane, butane. General formula CₙH₂ₙ₊₂. Alkenes are unsaturated (C=C double bond): ethene, propene, butene. General formula CₙH₂ₙ.
How does fractional distillation work GCSE?
Crude oil is heated and vapours rise up a fractionating column. Different fractions condense at different heights based on their boiling points. Shorter chains = lower boiling point = collected higher up.
What is cracking GCSE Chemistry?
Cracking breaks long-chain hydrocarbons into shorter, more useful ones. Thermal cracking uses high temperature and pressure. Catalytic cracking uses a zeolite catalyst at lower temperatures.
How do you test for alkenes?
Add bromine water (orange). If it turns colourless, an alkene is present (double bond reacts with bromine). This is an addition reaction.
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