Page 03 4. The diagram below shows the energy profiles for a reaction carried out with and without a catalyst. 250 200 150 100 50 0 Reaction path Potential energy (kJ mol−1) What is the enthalpy change, in kJ mol–1, for the catalysed reaction? A –100 B –50 C +50 D +100 5. Limonene is a terpene molecule present in lemons. H2C H2C CH CH2 CH C CH3 C H3C CH2 limonene How many isoprene units are joined together in a limonene molecule? A 1 B 2 C 3 D 4 [Turn over
Get full Socratic AI guidance on this question — free in the Applaa desktop app
Appy Buddy guides you step-by-step toward the answer without giving it away. Type your attempt and get instant, mark-scheme-aware clues that teach you to think like an examiner.
Join Applaa Community
Create your own games, learn AI concepts, program interactive apps, and share with a kid-safe community approved by parents. Free forever on Windows and Mac.
Available for Windows and macOS · COPPA Compliant
Exam Specification Info
This question is part of the UK A-Level Chemistry syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
While Other Kids Get an AI Head Start, Is Yours Falling Behind?
Give your child the same AI app-building, exam prep and tutoring edge — free for the first month, no credit card needed.
Join 10,000+ students building their first AI-powered apps with Applaa