CHEM 104 Module 4 | General Chemistry II w/ Lab Exam
Q&A | Portage Learning
These are original practice questions written for study. They are not official CHEM
104, Portage Learning, or university exam questions and are not copied from any
copyrighted question bank. They cover common CHEM 104 Module 4 |
Thermodynamics topics: spontaneity, entropy, Gibbs free energy, the laws of
thermodynamics, free energy and equilibrium, and clinical applications.
Question 1:
The first law of thermodynamics states that:
A. Energy can be created
B. Energy can be destroyed
C. Energy is conserved
D. Entropy always increases
Correct answer: C
Rationale: Energy cannot be created or destroyed, only transferred or transformed.
Question 2:
The second law of thermodynamics states that for a spontaneous process:
A. The entropy of the universe increases
B. The entropy of the universe decreases
C. Energy is destroyed
D. Enthalpy always increases
Correct answer: A
Rationale: The second law states that ΔS_universe > 0 for spontaneous processes.
Question 3:
The third law of thermodynamics states that the entropy of a perfect crystal at 0 K is:
A. Zero
B. One
C. Infinite
D. Negative
Correct answer: A
Rationale: A perfect crystal at absolute zero has zero entropy.
,Question 4:
Which of the following is a state function?
A. Heat
B. Work
C. Entropy
D. Path length
Correct answer: C
Rationale: Entropy depends only on the current state, not the path taken.
Question 5:
Which of the following is NOT a state function?
A. Internal energy
B. Enthalpy
C. Entropy
D. Work
Correct answer: D
Rationale: Work depends on the path taken, so it is not a state function.
Question 6:
Entropy is a measure of:
A. Heat only
B. Disorder or randomness
C. Pressure only
D. Volume only
Correct answer: B
Rationale: Entropy measures dispersal of energy or disorder in a system.
Question 7:
Which process increases entropy?
A. Freezing water
B. Condensing steam
C. Melting ice
D. Forming a crystal
Correct answer: C
Rationale: Melting increases disorder, so entropy increases.
, Question 8:
Which process decreases entropy?
A. Boiling water
B. Melting ice
C. Freezing water
D. Sublimation
Correct answer: C
Rationale: Freezing orders molecules into a solid, decreasing entropy.
Question 9:
Which has greater entropy: 1 mole of ice or 1 mole of liquid water at 0°C?
A. Ice
B. Liquid water
C. Both equal
D. Neither has entropy
Correct answer: B
Rationale: Liquid water is more disordered than ice.
Question 10:
Which has greater entropy: 1 mole of liquid water or 1 mole of steam at 100°C?
A. Liquid water
B. Steam
C. Both equal
D. Neither has entropy
Correct answer: B
Rationale: Gas has much higher entropy than liquid.
Question 11:
Which reaction is likely to have positive ΔS?
A. 2 H₂(g) + O₂(g) → 2 H₂O(l)
B. CaCO₃(s) → CaO(s) + CO₂(g)
C. N₂(g) + 3 H₂(g) → 2 NH₃(g)
D. H₂O(g) → H₂O(l)
Correct answer: B
Rationale: A gas is produced from a solid, increasing entropy.
Q&A | Portage Learning
These are original practice questions written for study. They are not official CHEM
104, Portage Learning, or university exam questions and are not copied from any
copyrighted question bank. They cover common CHEM 104 Module 4 |
Thermodynamics topics: spontaneity, entropy, Gibbs free energy, the laws of
thermodynamics, free energy and equilibrium, and clinical applications.
Question 1:
The first law of thermodynamics states that:
A. Energy can be created
B. Energy can be destroyed
C. Energy is conserved
D. Entropy always increases
Correct answer: C
Rationale: Energy cannot be created or destroyed, only transferred or transformed.
Question 2:
The second law of thermodynamics states that for a spontaneous process:
A. The entropy of the universe increases
B. The entropy of the universe decreases
C. Energy is destroyed
D. Enthalpy always increases
Correct answer: A
Rationale: The second law states that ΔS_universe > 0 for spontaneous processes.
Question 3:
The third law of thermodynamics states that the entropy of a perfect crystal at 0 K is:
A. Zero
B. One
C. Infinite
D. Negative
Correct answer: A
Rationale: A perfect crystal at absolute zero has zero entropy.
,Question 4:
Which of the following is a state function?
A. Heat
B. Work
C. Entropy
D. Path length
Correct answer: C
Rationale: Entropy depends only on the current state, not the path taken.
Question 5:
Which of the following is NOT a state function?
A. Internal energy
B. Enthalpy
C. Entropy
D. Work
Correct answer: D
Rationale: Work depends on the path taken, so it is not a state function.
Question 6:
Entropy is a measure of:
A. Heat only
B. Disorder or randomness
C. Pressure only
D. Volume only
Correct answer: B
Rationale: Entropy measures dispersal of energy or disorder in a system.
Question 7:
Which process increases entropy?
A. Freezing water
B. Condensing steam
C. Melting ice
D. Forming a crystal
Correct answer: C
Rationale: Melting increases disorder, so entropy increases.
, Question 8:
Which process decreases entropy?
A. Boiling water
B. Melting ice
C. Freezing water
D. Sublimation
Correct answer: C
Rationale: Freezing orders molecules into a solid, decreasing entropy.
Question 9:
Which has greater entropy: 1 mole of ice or 1 mole of liquid water at 0°C?
A. Ice
B. Liquid water
C. Both equal
D. Neither has entropy
Correct answer: B
Rationale: Liquid water is more disordered than ice.
Question 10:
Which has greater entropy: 1 mole of liquid water or 1 mole of steam at 100°C?
A. Liquid water
B. Steam
C. Both equal
D. Neither has entropy
Correct answer: B
Rationale: Gas has much higher entropy than liquid.
Question 11:
Which reaction is likely to have positive ΔS?
A. 2 H₂(g) + O₂(g) → 2 H₂O(l)
B. CaCO₃(s) → CaO(s) + CO₂(g)
C. N₂(g) + 3 H₂(g) → 2 NH₃(g)
D. H₂O(g) → H₂O(l)
Correct answer: B
Rationale: A gas is produced from a solid, increasing entropy.
