Cambridge Chemistry 0620 Paper 6 Revision Guide for May/June 2026

Cambridge’s Chemistry 0620 Paper 6 is a 1‑hour, 40‑mark alternative‑to‑practical paper. Examiners often penalise careless data recording and misuse of vocabulary. This guide helps you deliver precise observations, calculations and evaluations.

The paper assesses planning, recording, analysing and evaluating experimental work. Common errors include writing temperatures and volumes to too few decimal places (e.g. 21 °C instead of 21.0 °C), confusing “observations” with interpretations, and using colloquial terms like “cloudy” instead of “precipitate”. Students also forget to identify independent and dependent variables when outlining procedures.

To prepare effectively:

• Match instrument precision: Record measurements with the correct number of decimal places according to the instrument’s resolution. For example, a thermometer marked to 0.1 °C requires readings like 21.0 °C.

• Use precise vocabulary: Distinguish between observations (what you see, such as effervescence or colour change) and conclusions (what it means, e.g. gas evolution). Use the term “precipitate” instead of informal words.

• Plan and evaluate rigorously: When describing procedures, identify the variables, equipment and safety precautions. In evaluation sections, suggest realistic improvements based on the sources of error you identify.

In your final revision, practise writing full experimental reports and check them against the mark scheme. Our IGCSE Chemistry Observation Glossary provides accurate terminology and examples to ensure you communicate like a chemist.