Edexcel IAL Chemistry A2 12.9 Entropy and reaction feasibility
Edexcel IAL Chemistry A2 12.9 Entropy and reaction feasibility
Use ΔStotal > 0 as the criterion, set total entropy to zero at the threshold and rearrange with compatible ΔH and ΔSsystem units before interpreting above or below it.
How this is tested
- State feasibility at a given temperature from the sign of total entropy change.
- Calculate a threshold temperature by setting ΔStotal to zero and rearranging H/T.
- Interpret how temperature changes the surroundings contribution and feasibility range.