Entropy

Question 0

Standard entropy

Answer 0

Entropy of a chemical at standard conditions

Question 1

Define Entropy

Answer 1

Measure of Disorder

In terms of space- (4 coins idea)
energy- in terms of energy quanta

Question 2

What increases entropy?

Answer 2

S–>L–>G

Increasing number of moles

Increasing number of chemicals

Increase in tempreture

Question 3

Why does temp increase Entropy

Answer 3

More positional arrangements

Larger range of energy quanta

Therefore more disorder

Question 4

Why does increasing number of moles increase entropy?

Answer 4

More molecules, more positional arrangements, more disorder

Question 5

How does increasing number of chemicals increase disorder?

Answer 5

More different chemicals, more positional arrangements, more disorder

Question 6

ΔS system

Answer 6

Energy gained or lost from surroundings

Exothermic- Heat is gained by surroundings +
Endothermic- Heat is lost from surroundings -

*for reactions taking place at a high temp, effect ΔH is smaller

Question 7

Thermodynamic Stabilitiy

Answer 7

• ΔS tot – unlikely to proceed

Question 8

Kinetic Stability

Answer 8

High Ea

Very slow rate