Entropy And Free Energy Flashcards
What is entropy (S)?
The measure of disorder in a system or systems
What happens to entropy if there is an increase in disorder?
The entropy increases
What happens to entropy if the disorder decreases?
Entropy is lowered
What are the units for entropy?
JK mol -1
What happens to entropy when going from a solid, liquid to a gas?
Entropy increases as there’s an increase in random movement of particles (disorder) which increases entropy
when melting and boiling, why doesn’t temperature increase?
because energy is being used to raise the entropy, this doesn’t change the temperature
when can you tell from a chemical equation if entropy if increasing or decreasing?
-if there is a formation of a gas entropy increases,as there’s an increase in disorder.
- if there is a formation of solid entropy decreases because disorder does.
how do you calculate entropy (s)?
S=(products)-(reactants)
what is the acronym for calculating (s) entropy?
SPAR
what is a feasible process?
process which occurs without a continuous supply of energy
what does delta G have to be for a reaction to be feasible?
delta G has to be negative
what does delta G have to be for a reaction to be feasible?
delta G has to be negative
what is Gibbs free energy equation?
Gibbs free energy = H-(TxS)
H= KJmol-1
S= JKmol-1
when calculating Gibbs free energy what do you have to do to entropy first?
have to divide entropy by 1000 to make the units KJ mol -1
how do you calculate the minimum temperature for a reaction to become feasible?
t= H/S
(house divided by sand)
