AP Style Questions Unit 9 Part 2

Absolute Entropy and Entropy Change

1. Relative to what is absolute entropy measured?

a) Room temperature
b) Boiling point
c) Perfect crystal at 0 K
d) Standard pressure

2. What happens to entropy when a solid dissolves in a liquid?

a) Decreases
b) Increases
c) Remains constant
d) Fluctuates

3. How is entropy change calculated for a reaction?

a) Sum of reactants minus sum of products
b) Sum of products minus sum of reactants
c) Product of reactants divided by products
d) Difference in temperature

4. Which phase generally has the highest entropy?

a) Solid
b) Liquid
c) Gas
d) Plasma

5. What does a negative ΔS indicate about a reaction?

a) Increase in disorder
b) Decrease in disorder
c) No change in disorder
d) Equilibrium

6. What effect does mixing substances have on entropy?

a) Decreases entropy
b) Increases entropy
c) No effect on entropy
d) Makes entropy fluctuate

7. Why might an endothermic reaction still occur spontaneously?

a) High enthalpy change
b) Significant increase in entropy
c) Low activation energy
d) Catalyst presence

8. Which phase has the lowest standard entropy?

a) Gas
b) Liquid
c) Solid
d) Plasma