Chemistry A-Level
excess of one reagent
What excess of one reagent means in Chemistry A-Level, as defined for AQA.
Definition of excess of one reagent
Check what you remember
Read the wording for your board, then hide it and explain excess of one reagent in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
A large excess of methane keeps most molecules at the mono-substituted stage, while an excess of chlorine drives the mixture towards the more highly chlorinated products.
Topics that use excess of one reagent
- Chlorination of alkanes (AQA A-Level)
Related terms
Using excess of one reagent 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