Entropy

Question 0

What has a higher entropy, a solid or a gas?

Answer 0

Gas

Question 1

Define entropy

Answer 1

A measure of the disorder of a system

The higher the entropy, the more disordered the system, and the more energetically stable the system becomes

Question 2

What is the difference in entropy when a solid lattice dissolves?

Answer 2

The entropy increases

Question 3

Which side has the higher entropy in this reaction:

2A(g) + B(g) –> C(g)

Answer 3

The left hand side has a higher entropy because there are more moles of gas

Question 4

ΔS (change in entropy) =

Answer 4

ΣS products - ΣS reactants

Question 5

ΔG determines the…

Answer 5

Feasibility of a reaction

Question 6

ΔG =

Answer 6

ΔH - TΔS

Question 7

Units of ΔS

Answer 7

JK^-1mol^-1

Question 8

Units of ΔS when calculating free energy change

Answer 8

kJK^-1mol^-1

Question 9

Units of T

Answer 9

Kelvin

Question 10

What is the conversion from Celsius to kelvin

Answer 10

+273

Question 11

For a reaction to happen spontaneously, ΔG must be

Answer 11

Less than 0

Question 12

How do endothermic reactions take place spontaneously?

Answer 12

ΔS must be positive

The temperature must be high enough so that TΔS > ΔH