Cambridge Chemistry 0620 Paper 2 Revision Guide for May/June 2026

Cambridge’s Chemistry 0620 Paper 2 is a 45‑minute, 40‑mark multiple‑choice paper covering the extended syllabus. Candidates often underestimate the subtlety of MCQ wording and the depth of knowledge required. This guide targets the errors examiners see again and again.

The paper tests atomic structure, chemical reactions, periodic trends and organic chemistry. Examiner reports show that students frequently misjudge the exact composition of Earth’s atmosphere—forgetting the small percentage of argon and carbon dioxide—and mix up organic molecules such as ethane and ethene in combustion questions. Confusing flame test colours with sulfate tests also costs marks. Successful candidates read every option carefully and use elimination strategies.

To prepare effectively:

• Know your facts: Memorise atmospheric composition and recall key trends in the periodic table. Learn the colour changes for common tests (e.g. flame colours, gas tests and sulfate tests) to eliminate implausible options quickly.

• Distinguish similar compounds: Understand the structural differences between alkanes and alkenes; practise identifying functional groups in combustion and organic synthesis questions.

• Read options carefully: When faced with tricky MCQs, underline key words in the stem, analyse each option against your knowledge and eliminate distractors before selecting your answer. In the weeks leading up to May/June 2026, practise timed MCQs and review why incorrect answers are wrong. This active method builds speed and accuracy. Access our High‑Frequency Distractor Question Resource to tackle the most challenging MCQs and gain an edge.