71. Standard enthalpy of formation of elements in standard state is:
A) 1
B) 0
C) -1
D) Infinite
Answer: B
72. The heat of combustion of methane is:
A) Positive
B) Negative
C) Zero
D) Undefined
Answer: B
73. Energy stored in bonds is called:
A) Kinetic energy
B) Chemical energy
C) Thermal energy
D) Mechanical energy
Answer: B
74. Breaking bonds requires:
A) Energy
B) No energy
C) Heat release
D) Work only
Answer: A
75. Formation of bonds releases:
A) Energy
B) Mass
C) Pressure
D) Volume
Answer: A
76. Which is an exothermic process?
A) Photosynthesis
B) Respiration
C) Evaporation
D) Melting
Answer: B
77. Heat of reaction at constant volume equals:
A) ΔH
B) ΔE
C) q
D) w
Answer: B
78. The term “thermochemical equation” includes:
A) Heat change
B) Pressure only
C) Volume only
D) Temperature only
Answer: A
79. Which is a state function?
A) Work
B) Heat
C) Enthalpy
D) Path
Answer: C
80. Which is not a state function?
A) Enthalpy
B) Internal energy
C) Heat
D) Pressure
Answer: C