91. The enthalpy change of neutralization is always:
A) Positive
B) Negative
C) Zero
D) Variable
Answer: B
92. The sign convention for heat absorbed is:
A) Negative
B) Positive
C) Zero
D) Undefined
Answer: B
93. The sign convention for heat released is:
A) Positive
B) Negative
C) Zero
D) Undefined
Answer: B
94. Heat energy is transferred due to:
A) Pressure difference
B) Temperature difference
C) Volume difference
D) Mass difference
Answer: B
95. A process with no heat exchange is:
A) Isothermal
B) Adiabatic
C) Isobaric
D) Isochoric
Answer: B
96. Isobaric process occurs at constant:
A) Volume
B) Pressure
C) Temperature
D) Energy
Answer: B
97. Isochoric process occurs at constant:
A) Volume
B) Pressure
C) Temperature
D) Heat
Answer: A
98. Isothermal process occurs at constant:
A) Volume
B) Pressure
C) Temperature
D) Heat
Answer: C
99. Photosynthesis is:
A) Exothermic
B) Endothermic
C) Neutral
D) Reversible
Answer: B
100. Thermochemistry is important for studying:
A) Heat changes in chemical reactions
B) Atomic structure
C) Molecular geometry
D) Color changes
Answer: A