Chem 1A Practice Exam III
Two balloons are filled with He and are in different locations. Both have the same temperature and the same m
of He. Balloon A is being kept at a pressure that is twice that of balloon B.
1) Which balloon has the higher volume?
a) A b) B c) both the same d) not enough information was given
2) Which balloon has the higher gas density?
a) A b) B c) both the same d) not enough information was given
3) Which will release the most energy as it cools from 50 to 25 C? Specific heats in parenthesis.
a) 1 kg of water (4.18 J/gC)
b) 1 kg of Al (0.90 J/gC)
c) 1 kg of ethanol (2.42 J/gC)
d) 1 kg of sand (0.84 J/gC)
e) all the same because they weigh the same
4) When you take liquid water from 25 to 50 C, the process is:
a) Endothermic, with the energy being used to break the σ bonds in water
b) Exothermic, with energy being released as σ bonds break
c) Endothermic, with the energy being used to break some of the intermolecular between some wa
molecules
d) Exothermic, with energy being released when you break some of the intermolecular forces betwee
the molecules
e) Endothermic, with energy being released when you break all the intermolecular forces
5) Which forces are present in NCl3?
a) Ion-ion b) dipole-dipole c) dispersion d) b and c e) a, b and c
6) Which is expected to have the most force as a pure substance?
a) CH3OH b) CH3SH c) CH3F d) CH3Cl e) CH3Br
7) Which is expected to have the highest boiling point at a given T?
a) CO2 b) NO2 c) SO3 d) CS2 e) O3
8) Which is expected to exhibit the higher vapor pressure?
a) CH4 b) CH2O c) KI d) CF4 e) H2O
9) Which of the following relationships is correct?
Two balloons are filled with He and are in different locations. Both have the same temperature and the same m
of He. Balloon A is being kept at a pressure that is twice that of balloon B.
1) Which balloon has the higher volume?
a) A b) B c) both the same d) not enough information was given
2) Which balloon has the higher gas density?
a) A b) B c) both the same d) not enough information was given
3) Which will release the most energy as it cools from 50 to 25 C? Specific heats in parenthesis.
a) 1 kg of water (4.18 J/gC)
b) 1 kg of Al (0.90 J/gC)
c) 1 kg of ethanol (2.42 J/gC)
d) 1 kg of sand (0.84 J/gC)
e) all the same because they weigh the same
4) When you take liquid water from 25 to 50 C, the process is:
a) Endothermic, with the energy being used to break the σ bonds in water
b) Exothermic, with energy being released as σ bonds break
c) Endothermic, with the energy being used to break some of the intermolecular between some wa
molecules
d) Exothermic, with energy being released when you break some of the intermolecular forces betwee
the molecules
e) Endothermic, with energy being released when you break all the intermolecular forces
5) Which forces are present in NCl3?
a) Ion-ion b) dipole-dipole c) dispersion d) b and c e) a, b and c
6) Which is expected to have the most force as a pure substance?
a) CH3OH b) CH3SH c) CH3F d) CH3Cl e) CH3Br
7) Which is expected to have the highest boiling point at a given T?
a) CO2 b) NO2 c) SO3 d) CS2 e) O3
8) Which is expected to exhibit the higher vapor pressure?
a) CH4 b) CH2O c) KI d) CF4 e) H2O
9) Which of the following relationships is correct?
