Chemistry A-Level
Temperature dependence and threshold temperature
What Temperature dependence and threshold temperature means in Chemistry A-Level, as defined for OCR.
Definition of Temperature dependence and threshold temperature
Check what you remember
Read the wording for your board, then hide it and explain Temperature dependence and threshold temperature in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Temperature scales the T∆S term, so a reaction with positive ∆H and positive ∆S becomes feasible only above a threshold temperature, while one with negative ∆H and negative ∆S is feasible only below a threshold.
Topics that use Temperature dependence and threshold temperature
- Enthalpy and entropy (OCR A-Level)
Related terms
- Activation energy and reaction rate
- Comparison of solid, liquid and gas
- Entropy change and the T∆S term
- Entropy of the system
- Feasibility and the sign of ∆G
- Freedom of motion of particles in each state
- Gibbs equation and free energy change
- Gibbs free energy and feasibility
Using Temperature dependence and threshold temperature 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