Combined Science GCSE
Comparing measured and known values
What Comparing measured and known values means in Combined Science GCSE, as defined for AQA.
Definition of Comparing measured and known values
Check what you remember
Read the wording for your board, then hide it and explain Comparing measured and known values in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
To distinguish pure from impure, compare the measured melting point or boiling point with the known value for that substance.
Topics that use Comparing measured and known values
- Pure substances (AQA GCSE)
Related terms
- Everyday versus chemical meaning of pure
- Fixed melting and boiling points of pure substances
- Melting and boiling ranges of mixtures
- Mixture
- Mixtures versus single substances
- Pure substance
- Sharp versus range melting and boiling
- Using data to test purity
Using Comparing measured and known values in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Combined Science questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Combined Science GCSE termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge