This exam focus covers Exam Focus: Alkenes within Alkenes for GCSE Chemistry. Revise Alkenes in Organic Chemistry for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 12 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 12 of 14
Practice
20 questions
Recall
15 flashcards
🎯 Exam Focus: Alkenes
very-high Bromine water test (2 marks): Say "decolourised" not just "changes colour". Must state the observation AND the conclusion.
very-high Formula questions (1-2 marks): Use CₙH₂ₙ. Common trap: choosing the alkane formula CₙH₂ₙ₊₂ by mistake.
high Addition reaction equations (2 marks): Show product clearly — double bond becomes single, one atom from each reactant bonds to each carbon.
high Unsaturated definition (1-2 marks): "Contains a C=C double bond" — must be this specific, not just "reactive".