Entropy Flashcards
1
Q
what is the equation for entropy change ?
A
- products - reactants
SPAR
2
Q
what does a positive entropy change mean
A
means there is more disorder eg, from solid –> liquid —> gas
3
Q
Gibbs Free energy equation + when is a reaction feasible
A
△G = △H - T△S
- reaction feasible when △G is negative
4
Q
Equation to work out temp when G= 0
A
△S
5
Q
When is Gibbs always negative (reaction always feasible)
A
- when △H is negative and △S is positive
6
Q
when is G negative for endothermic reactions
A
- when △S is +ve at high temp
7
Q
when is G negative for exothermic reactions
A
- when △S is -ve, at low temp
8
Q
when is Gibbs always postive
A
when △H is positive and △S is negative
