Loading…
Loading…
GCSE Chemistry · key term
A trusted value for a known substance, used for comparison with an experimental result.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Melting point and puritySample A: 134–135 °C — a narrow range close to the reference value, so the sample is likely to be pure.
When given melting data, compare both the position and the width of the melting range with the reference value.
If the question asks about identity as well as purity, say that a sharp melting point matching the reference value supports the proposed identity.
Create a free account to read GCSE Chemistry revision notes for your exam board and track your progress.