THERMODYNAMICS EXAMINATION QUESTIONS AND CORRECT ANSWER WITH EXPLANATION GRADED A+ STUDY GUIDE

THERMODYNAMICS EXAMINATION QUESTIONS AND
CORRECT ANSWER WITH EXPLANATION GRADED A+
STUDY GUIDE SOUTHERN NEW HAMPSHIRE UNIVERSITY
1. Thermodynamics is the study of:
A. Heat and energy changes
B. Rocks only
C. Motion of planets
D. Cell structure
Answer: A
Rationale: It focuses on energy transformations.

2. System in thermodynamics refers to:
A. Part under study
B. Entire universe
C. Outside environment
D. Laboratory tools
Answer: A
Rationale: The specific portion being analyzed.

3. Surroundings are:
A. Everything outside the system
B. Only gases
C. Only liquids
D. Only solids
Answer: A
Rationale: External environment.

4. Universe in thermodynamics is:
A. System + surroundings
B. Only system
C. Only surroundings
D. Only energy
Answer: A
Rationale: Total of all components.

5. Open system allows:
A. Energy and matter exchange

, B. No exchange
C. Only energy
D. Only matter
Answer: A
Rationale: Both energy and matter can move.

6. Closed system allows:
A. Energy exchange only
B. Matter exchange only
C. No energy
D. No matter
Answer: A
Rationale: Matter is fixed, energy flows.

7. Isolated system allows:
A. No exchange of energy or matter
B. Only energy
C. Only matter
D. Both exchanges
Answer: A
Rationale: Completely sealed system.

8. First law of thermodynamics is:
A. Energy conservation law
B. Mass destruction law
C. Heat loss law
D. Pressure law
Answer: A
Rationale: Energy cannot be created or destroyed.

9. Internal energy is:
A. Total energy of system
B. External heat only
C. Pressure only
D. Volume only
Answer: A
Rationale: Sum of all molecular energies.

10. Enthalpy is:
A. Heat content at constant pressure

, B. Mass content
C. Volume content
D. Pressure only
Answer: A
Rationale: Heat energy measure.

11. Enthalpy change is:
A. Heat absorbed or released
B. Mass change
C. Volume change
D. Pressure change
Answer: A
Rationale: Energy transfer.

12. Exothermic reaction:
A. Releases heat
B. Absorbs heat
C. No heat change
D. No reaction
Answer: A
Rationale: Energy released to surroundings.

13. Endothermic reaction:
A. Absorbs heat
B. Releases heat
C. No energy change
D. Only light
Answer: A
Rationale: Energy taken in.

14. Enthalpy change sign for exothermic:
A. Negative
B. Positive
C. Zero
D. Undefined
Answer: A
Rationale: Heat released.

15. Enthalpy change sign for endothermic:
A. Positive