Thermodynamics: Interactive Learning Quizzes for Chemistry Students

Question 1

How are enthalpy and entropy related: enthalpy and entropy are directly proportional?

Accepted Answer

False

Answer

True

Question 2

What is the enthalpy change of a reaction that is carried out at constant pressure?

Accepted Answer

ΔH

Answer

ΔU

Answer

ΔG

Answer

ΔS

Question 3

Which of the following is a reversible process: a chemical reaction that produces a gas?

Accepted Answer

False

Answer

True

Question 4

Which of the following is a measure of the disorder or randomness of a system?

Accepted Answer

Entropy

Answer

Enthalpy

Answer

Free energy

Answer

Temperature

Question 5

The spontaneity of a reaction is primarily determined by:

Accepted Answer

Change in free energy of the system

Answer

Change in entropy of the system

Answer

Change in enthalpy of the system

Answer

Change in temperature of the system

Question 6

Which of the following reactions is an example of an exothermic reaction?

Accepted Answer

Combustion of methane

Answer

Freezing of water

Answer

Photosynthesis of glucose

Answer

Hydrolysis of ATP

Question 7

The enthalpy of a system refers to the:

Accepted Answer

Sum of internal energy and the product of pressure and volume

Answer

Total energy of the system

Answer

Difference between internal energy and the product of pressure and volume

Answer

Quotient of internal energy and the product of pressure and volume

Question 8

Entropy is primarily a measure of the:

Accepted Answer

Order or disorder of a system

Answer

Energy of a system

Answer

Temperature of a system

Answer

Pressure of a system

Question 9

The free energy of a system represents the:

Accepted Answer

Energy available to do work

Answer

Energy stored in the system

Answer

Energy lost by the system

Answer

Energy gained by the system

Question 10

Which statement accurately describes the relationship between the change in entropy and the randomness of a system?

Accepted Answer

Entropy change is directly proportional to randomness change.

Answer

Entropy change is inversely proportional to randomness change.

Answer

Entropy change is independent of randomness change.

Answer

Randomness change is inversely proportional to entropy change.

Question 11

Which of the following statements best describes the First Law of Thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

The total energy of a closed system remains constant.

Answer

Heat and work are the only forms of energy that can be transferred.

Question 12

The enthalpy change of a reaction represents:

Accepted Answer

The difference in the total energy of the products and reactants.

Answer

The difference in the entropy change of the products and reactants.

Answer

The difference in the temperature change of the products and reactants.

Question 13

Which of the following processes is exothermic?

Accepted Answer

Combustion of propane

Answer

Melting of ice

Answer

Dissolution of sugar in water

Answer

Evaporation of water

Question 14

Entropy is a measure of:

Accepted Answer

The disorder or randomness of a system.

Answer

The pressure of a system.

Answer

The energy of a system.

Answer

The temperature of a system.

Question 15

The free energy change of a reaction is:

Accepted Answer

The difference in the Gibbs free energy of the products and reactants.

Answer

The difference in the entropy of the products and reactants.

Answer

The difference in the enthalpy of the products and reactants.

Question 16

The equilibrium constant for a reaction is:

Accepted Answer

The ratio of the concentrations of the products to the concentrations of the reactants at equilibrium.

Answer

The difference in the Gibbs free energy of the products and reactants.

Answer

The rate of the forward reaction divided by the rate of the reverse reaction.

Question 17

Which of the following factors does NOT affect the equilibrium constant of a reaction?

Accepted Answer

Volume of the reaction vessel

Answer

Temperature

Answer

Presence of a catalyst

Answer

Concentration of the reactants

Question 18

The Gibbs free energy of a system is a combination of:

Accepted Answer

Enthalpy and entropy

Answer

Volume and pressure

Answer

Entropy and volume

Answer

Enthalpy and volume

Question 19

Which of the following statements is NOT a law of thermodynamics?

Accepted Answer

Energy can be created or destroyed.

Answer

Entropy of an isolated system increases over time.

Answer

Energy can neither be created nor destroyed.

Question 20

What is the change in enthalpy of a chemical reaction?

Accepted Answer

The amount of heat released or absorbed during the reaction.

Answer

The amount of work done by the reaction.

Question 21

What is the key difference between entropy and free energy?

Accepted Answer

Entropy measures disorder, while free energy measures the capacity to do work.

Answer

Entropy measures heat, while free energy measures work done by the system.

Question 22

Which factors influence the equilibrium constant of a reaction?

Accepted Answer

Temperature, pressure, and concentration of reactants and products.

Answer

Temperature and pressure only.

Answer

Concentration and pressure only.

Answer

Temperature and concentration only.

Question 23

What does the Gibbs free energy measure?

Accepted Answer

The spontaneity of a reaction.

Answer

The entropy of a reaction.

Answer

The enthalpy of a reaction.

Question 24

How is the equilibrium constant related to Gibbs free energy?

Accepted Answer

ΔG° = -RTlnK

Answer

ΔG° = K/RT

Answer

ΔG° = RTlnK

Question 25

Define the standard enthalpy of formation.

Accepted Answer

The enthalpy change for forming one mole of a substance from its constituent elements in their standard states.

Answer

The enthalpy change for forming one mole of a substance from its constituent elements in their gaseous states.

Question 26

What is the significance of the third law of thermodynamics?

Accepted Answer

The entropy of a perfect crystal at absolute zero is zero.

Answer

The enthalpy of a perfect crystal at absolute zero is zero.

Question 27

Which process is considered spontaneous?

Accepted Answer

A process that decreases in free energy.

Answer

A process that remains constant in free energy.

Answer

A process that increases in free energy.