PRINCE GEORGE’S COMMUNITY COLLEGE
CHM1010(SHAH)
THERMOCHEMISTRY
1) Energy that is associated with the position or composition of an object is called
A) kinetic energy B) thermal energy C) potential energy D) chemical energy
Answer: C
2) Which of the following signs on q and w represent a system that is doing work on
the surroundings, as well as losing heat to the surroundings?
A) q = - , w = B) q = +, w = + C) q = -, w = +
D) q = +, w = Answer: A
3) Which of the following signs on q and w represent a system that is doing work on
the surroundings, as well as gaining heat from the surroundings?
A) q = +, w = B) q = -, w = +
C) q = +, w = + D) q = -, w = Answer: A
4) Which of the following is TRUE if ΔEsys = - 95 J?
A) The system is gaining 95 J, while the surroundings are losing 95 J.
B) The system is losing 95 J, while the surroundings are gaining 95 J.
C) Both the system and the surroundings are gaining 95 J.
D) Both the system and the surroundings are losing 95 J.
Answer: B
5) Calculate the change internal energy (ΔE) for a system that is giving off 45.0 kJ
of heat and is performing 855 J of work on the surroundings.
A) 44.1 kJ B) -44.1 kJ C) -45.9 kJ D) 9.00 x 102 kJ
Answer: C
6) For ΔEsys to always be -, what must be true?
A) q = w
B) +q > -w C) +w > -q D) -w > +q
Answer: D
7) Define heat capacity.
A) the quantity of heat required to raise the temperature of 1 mole of a substance
by 1°C
B) the quantity of heat required to change a system's temperature by 1°C
C) the quantity of heat required to raise the temperature of 1 gram of a substance
by 1°C
D) the quantity of heat required to raise the temperature of 1 g of a substance by
1°F
E) the quantity of heat required to raise the temperature of 1 liter of a substance by
1°C
Answer: B
8) Define specific heat capacity.
A) the quantity of heat required to raise the temperature of 1 mole of a substance
by 1°C
B) the quantity of heat required to change a system's temperature by 1°C
C) the quantity of heat required to raise the temperature of 1 gram of a substance
by 1°C
D) the quantity of heat required to raise the temperature of 1 gram of a substance
by 1°F
E) the quantity of heat required to raise the temperature of 1 liter of a substance by
1°C
Answer: C
9) Define molar heat capacity.
A) the quantity of heat required to raise the temperature of 1 mole of a substance
by 1°C
B) the quantity of heat required to change a system's temperature by 1°C
C) the quantity of heat required to raise the temperature of 1 gram of a substance
by 1°C
D) the quantity of heat required to raise the temperature of 1 g of a substance by
1°F
Answer: A
10) Give the units of heat capacity.
A) J/°C
B) J/g °C
C) J/mole °C D) g/ °C
E) mol/ °C
Answer: A
11) Give the units of specific heat capacity.
A) 1/°C
B) J/g °C
C) J/mole °C D) g/ °C
Answer: B
12) Calculate the amount of heat (in kJ) required to raise the temperature of a 79.0
g sample of ethanol from 298.0 K to 385.0 K. The specific heat capacity of ethanol
is 2.42 J/g°C.
A) 57.0 kJ
B) 16.6 kJ
C) 73.6 kJ
D) 28.4 kJ
E) 12.9 kJ
Answer: B
13) Calculate the amount of heat (in kJ) necessary to raise the temperature of 47.8
g benzene by 57.0 K. The specific heat capacity of benzene is 1.05 J/g°C
A) 1.61 kJ
Answer: D
B) 16.6 kJ
C) 2.59 kJ
D) 2.86 kJ