Combined Science GCSE
Energy level diagrams and enthalpy changes
What Energy level diagrams and enthalpy changes means in Combined Science GCSE, as defined for AQA.
Definition of Energy level diagrams and enthalpy changes
Check what you remember
Read the wording for your board, then hide it and explain Energy level diagrams and enthalpy changes in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The magnitude is the same, but an exothermic change has a negative sign and an endothermic change has a positive sign when expressed as enthalpy change.
Topics that use Energy level diagrams and enthalpy changes
- Energy changes and reversible reactions (AQA GCSE)
Related terms
- Conservation of energy
- Exothermic and endothermic energy transfers
- Reversibility of chemical reactions
Using Energy level diagrams and enthalpy changes 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