1. Thermochemistry deals with:
A) Rate of reactions
B) Heat changes in reactions
C) Structure of atoms
D) Bond angles
Answer: B
2. The SI unit of heat energy is:
A) Calorie
B) Joule
C) Watt
D) Kelvin
Answer: B
3. 1 calorie is equal to:
A) 2.18 J
B) 4.18 J
C) 1.18 J
D) 3.18 J
Answer: B
4. Exothermic reactions release:
A) Light
B) Heat
C) Sound
D) Electricity
Answer: B
5. Endothermic reactions:
A) Release heat
B) Absorb heat
C) Do not involve energy
D) Produce light only
Answer: B
6. Enthalpy is represented by:
A) E
B) H
C) Q
D) U
Answer: B
7. Change in enthalpy is denoted as:
A) ΔT
B) ΔH
C) ΔE
D) ΔQ
Answer: B
8. For exothermic reactions, ΔH is:
A) Positive
B) Negative
C) Zero
D) Infinite
Answer: B
9. For endothermic reactions, ΔH is:
A) Negative
B) Positive
C) Zero
D) Undefined
Answer: B
10. Standard temperature is:
A) 0°C
B) 25°C
C) 50°C
D) 100°C
Answer: B