O5

Question 1

What is the second factor that drives a chemical process?

Answer 1

A tendency towards randomising or disordering

Question 2

What is entropy?

Answer 2

A measure of the number of ways of arranging molecules and distributing energy

Question 3

What is the symbol for entropy?

Answer 3

S

Question 4

What happens to entropy as temperature increases?

Answer 4

Increases as the particles gain energy and move faster and further apart

Question 5

Which out of solid, gas and liquid has the highest entropy?

Answer 5

Gas

Question 6

What type of value is change in entropy when products are more disordered than reactants?

Answer 6

Positive

Question 7

What are the units for entropy?

Answer 7

JK-1mol-1

Question 8

When does a collection of molecules have higher entropy?

Answer 8

• When the molecules are spread out more
• When the energy is shared among more moleucles

Question 9

How do you calculate entropy change?

Answer 9

Some of entropies of products - Sum of entropies of reactants

Question 10

How do you predict whether a change is feasible?

Answer 10

Question 11

How do you calculate the entropy change of a system?

Answer 11

Change in product entropy - change in reactants entropy

Question 12

How do you calculate the entropy change of the surroundings?

Answer 12

Question 13

Kjmol-1 -> jmol-1

Answer 13

X1000

Question 14

Degrees C -> K

Answer 14

+273

Question 15

What is the requirement for equilibrium?

Answer 15

Change in total entropy = 0