Chem Test Page 2

Chem Test Page 2

51.  The forces of attraction between polar molecules are called: a) covalent bonds; b) dispersion forces;
c) ionic forces; d) dipole-dipole forces; e) atomic forces.

52.  The intermolecular attraction between the hydrogen atom of one molecule and a lone pair of electrons on a highly electronegative atom of another molecule is called: a) electron affinity;
b) covalent bonding; c) dispersion force; d) electrobonding; e) hydrogen bonding.

53.  The intermolecular forces that result from “momentary” dipoles caused by the movement of electrons:
a) electron affinity; b) covalent; c) dispersion forces; d) hydrogen bonding.

54.  Pressure could be increased by: a) changing the units used to measure force; b) reducing the area the force acts on; c) increasing the area the force acts on; d) decreasing the force.

55.  Normal atmospheric pressure is: a) 101.3 kPa; b) the average atmospheric pressure at sea level;
c) 760 mm Hg; d) all of the above.

56.  Convert 225 kPa to mmHg. a) 0.296 b) 2.22 c) 29.9 d) 1688

57.  The pressure at a particular point in a liquid depends upon: a) the total volume of the liquid;
b) the depth at that point; c) the cross sectional area of the liquid; d) none of the above.

58.  Atmospheric pressure: a) is always 101.3 kPa; b) increases as elevation is increased;
c) decreases as elevation is increased; d) is measured with a manometer.

59.  The pressure of the atmosphere at sea level will support a column of mercury that has a height of:
a) 760 mm; b) 22.4 mm; c) 101.3 mm; d) 1.0 m.

60.  What instrument is used to measure atmospheric pressure?
a) barometer; b) galvinometer; c) kelvinometer; d) manometer.

61.  The temperature at which a liquid rapidly changes into a gas at a pressure of 760 mm Hg:
a) melting point; b) normal melting point; c) atmospheric boiling point; d) normal boiling point.

62.  A change in phase from a gas to a liquid is called:
a) fusion; b) evaporation; c) sublimation; d) condensation.

63.  In solids, the motion of the molecules is: a) totally absent; b) a vibration around a fixed position;
c) faster than the motion in the liquid phase; d) not dependent upon the temperature.

64.  In which phase does the force of attraction between molecules have the greatest effect?
a) solid; b) liquid; c) gas.

65.  In which phase does the force of attraction between molecules have the least effect?
a) solid; b) liquid; c) gas.

66.  In liquids, some molecules at the surface have enough energy to leave the liquid and enter the gas phase. This is called: a) fusion; b) evaporation; c) sublimation; d) boiling.

67.  Which of the following has a definite volume? a) liquid; b) gas; c) solid; d) a and c; e) a and b

68.  The process by which a liquid rapidly turns into a gas throughout the liquid is BEST defined as:
a) sublimation; b) boiling; c) vaporization; d) fusion; e) compressibility

69.  Solids that do not have a regular shape and have no definite melting point:
a) amorphous solids; b) irregular solids; c) crystalline solids; d) deposition solids; e) fused solids

70.  The change in phase from a gas to a solid is called: a) condensation; b) sublimation;
c) deposition; d) evaporation; e) exasperation

Use the graph below to answer questions 71 - 77. The graph was obtained by measuring the temperature of a substance as it is heated. Initially the substance was totally solid.

71.  During segment A of the graph, the heat absorbed is being converted to: a) liquid; b) gas;
c) potential energy; d) kinetic energy

72.  What is the boiling point of the substance?
a) 20 °C; b) 30 °C; c) 35 °C; d) 40 °C; e) 45 °C

73.  What phase(s) are present during segment B? a) solid; b) liquid; c) gas;
d) liquid and solid; e) liquid and gas

74.  During segment B of the graph, the heat absorbed is being converted to: a)solid; b) gas;
c) potential energy; d) kinetic energy

75.  During what segment of the graph would you have only liquid present? a) A; b) B; c) C; d) D

76.  What phase(s) are the substance in after 11 minutes? a) solid; b) liquid; c) gas;
d) liquid and solid; e) liquid and gas

77.  What is the melting point of the substance?
a) 20 °C; b) 30 °C; c) 35 °C; d) 40 °C; e) 45 °C

78.  On a heating curve, which of the following indicates a phase change is occuring?
a) a plateau (temperature stays constant); b) an increase in temperature;
c) a decrease in temperature; d) all of the above

79.  The change in phase from a solid to gas is called: a) condensation; b) sublimation;
c) deposition; d) evaporation; e) exasperation

80.  Which molecules of a liquid will enter the gas phase during evaporation?
a) those with lower kinetic energy; b) those with higher kinetic energy;
c) those with a higher density; d) none of the above.

81.  In order for a liquid to boil, its vapor pressure must be __?__ atmospheric pressure.
a) equal to; b) less than .

82.  What effect does evaporation have on the temperature of a liquid that is evaporating?
a) the temperature of the liquid decreases; b) the temperature of the liquid increases;
c) evaporation has no effect on temperature

83.  When a liquid is in equilibrium with its vapor: a) no more evaporation will occur;
b) the rates of evaporation and condensation are equal;
c) the vapor pressure of the liquid is zero; d) no more condensation occurs.

84.  For most substances, the density of the liquid is __?__ the density of the solid.
a) greater than; b) less than; c) equal to.

85.  Water, unlike most substances, expands when it freezes. This is a direct result of: a) a greater density of ice compared to liquid water; b) the open crystal structure of ice; c) an increase in the attractive forces between particles; d) the intermolecular repulsion of ice particles.

86.  Water molecules at 0 °C, compared to ice molecules at 0 °C, have: a) more kinetic energy;
b) less kinetic energy; c) more potential energy; d) less potential energy.

87.  Which of the following processes is exothermic?
a) boiling; b) melting; c) evaporation; d) freezing.

88.  As you travel up a mountain, what happens to the boiling point of water?
a) it increases; b) it decreases; c) it stays the same.

89.  As the temperature of a liquid increases, what happens to the vapor pressure of the liquid?
a) it increases; b) it decreases; c) it stays the same.

90.  Pressure cookers work because: a) the pressure inside is lower than the normal pressure, causing the water to boil at a higher temperature; b) the pressure inside is higher than the normal pressure, causing the water to boil at a higher temperature; c) the pressure inside is higher than the normal pressure, causing the water to boil at a lower temperature.

91.  Which phase has a definite volume but not a definite shape?
a) gas; b) liquid; c) solid

92.  Which phase has a both a definite volume and a definite shape?
a) gas; b) liquid; c) solid

93.  Pennsylvania was founded by: a) Sean Penn; b) Penn and Teller;
c) Benjamin Franklin; d) William Penn; e) Billy Bob Thornton