Chemistry A-Level
isomers
What isomers means in Chemistry A-Level, as defined for AQA.
Definition of isomers
Check what you remember
Read the wording for your board, then hide it and explain isomers in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Compounds that share a molecular formula, so a molecular formula alone never identifies a compound.
Topics that use isomers
- Empirical and molecular formula (AQA A-Level)
Related terms
- Empirical formula
- Molecular formula
- percentage composition
- scaling up fractions
- simplest ratio
- dividing by the smallest
- empirical formula mass
- multiplier from relative molecular mass
Using isomers 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 Chemistry questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Chemistry A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge