Courses » SS2 » SS2 Chemistry » Chemistry Exam Topics » Chemical Thermodynamics - Questions and Answers

Chemical Thermodynamics - SS2 Chemistry Past Questions and Answers - page 2

11

Which of the following statements is true about the Gibbs free energy (ΔG) of a reaction?

 

A

ΔG < 0 indicates a spontaneous reaction.

 

B

ΔG > 0 indicates a spontaneous reaction.

 

C

ΔG = 0 indicates a non-spontaneous reaction.

 

D

ΔG can only be determined experimentally.

Ask EduPadi AI...
12

The relationship between enthalpy change (ΔH), entropy change (ΔS), and Gibbs free energy change (ΔG) is given by:

 

A

ΔG = ΔH - TΔS

 

B

ΔG = ΔH + TΔS

 

C

ΔG = ΔH/T - ΔS

 

D

ΔG = ΔH/T + ΔS

Ask EduPadi AI...
13

For a spontaneous process at constant temperature and pressure, which of the following conditions must be satisfied?

 

A

ΔH < 0 and ΔS < 0

 

B

ΔH > 0 and ΔS > 0

 

C

ΔH > 0 and ΔS < 0

 

D

ΔH < 0 and ΔS > 0

Ask EduPadi AI...
14

The standard Gibbs free energy change (ΔG°) of a reaction can be calculated using the equation:

 

A

ΔG° = ΔH° - TΔS°

 

B

ΔG° = ΔH° + TΔS°

 

C

ΔG° = ΔH°/T - ΔS°

 

D

ΔG° = ΔH°/T + ΔS°

Ask EduPadi AI...
15

Which of the following factors can affect the spontaneity of a reaction?

 

A

Temperature only

 

B

Pressure only

 

C

Concentration of reactants only

 

D

Temperature, pressure, and concentration of reactants

Ask EduPadi AI...
16

The Third Law of Thermodynamics states that:

 

A

The total energy of the universe is constant.

 

B

Energy can neither be created nor destroyed.

 

C

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

 

D

The entropy of a system always increases.

Ask EduPadi AI...
17

Calculate the change in Enthalpy (ΔH) for a reaction given the following information:

Reaction: 2H2(g) + O2(g) → 2H2O(g)

ΔHf° (H2O(g)): -241.8 kJ/mol

ΔHf° (H2(g)): 0 kJ/mol

ΔHf° (O2(g)): 0 kJ/mol

Ask EduPadi AI...
18

Calculate the change in Entropy (ΔS) for a reaction given the following information:

Reaction: N2(g) + 3H2(g) → 2NH3(g)

ΔS° (N2(g)): 191.5 J/(mol·K)

ΔS° (H2(g)): 130.6 J/(mol·K)

ΔS° (NH3(g)): 192.5 J/(mol·K)

Ask EduPadi AI...
19

Calculate the Gibbs Free Energy (ΔG) for a reaction given the following information:

Reaction: 2H2O(g) → 2H2(g) + O2(g)

ΔGf° (H2O(g)): -237.2 kJ/mol

ΔGf° (H2(g)): 0 kJ/mol

ΔGf° (O2(g)): 0 kJ/mol

Ask EduPadi AI...
20

Which of the following statements is true about a spontaneous process?

 

A

It always occurs quickly.

 

B

It requires an input of energy.

 

C

It occurs without any external intervention.

 

D

It always leads to an increase in entropy

Ask EduPadi AI...
Please share this, thanks: