Review

79. Which molecule contains a nonpolar covalent bond?
(1)
(2)
80. Molecules in a sample of NH3 (…) are held closely together
by intermolecular forces
(1) existing between ions
(2) existing between electrons
(3) caused by different numbers of neutrons
(4) caused by unequal charge distribution
81. Which phase change results in the release of energy?
(1) H2O(s) H2O(…) (3) H2O(…) H2O(g) (2) H2O(s) H2O(g) (4) H2O(g) H2O(…) 82. Two samples of gold that have different temperatures are
placed in contact with one another. Heat will flow
spontaneously from a sample of gold at 60°C to a sample of
gold that has a temperature of
(1) 50°C (3) 70°C
(2) 60°C (4) 80°C
83. The average kinetic energy of water molecules is greatest in
which of these samples?
(1) 10 g of water at 35°C (3) 100 g of water at 25°C
(2) 10 g of water at 55°C (4) 100 g of water at 45°C
84. What is the equivalent of 0 Kelvin on the Celsius scale?
(1) –100º (3) –273º
(2) 100º (4) 273º
85. The temperature of a sample of water changes from 10.°C
to 20.°C when the water absorbs 420 Joules of heat. What
is the mass of the sample?
(1) 1.0 g (3) 100 g
(2) 10. g (4) 1000 g
86. What is the total number of joules released when a 5.00gram
sample of water changes from liquid to solid at 0°C?
(1) 334 J (3) 2260 J
(2) 1670 J (4) 11 300 J
87. How much energy is required to vaporize 10.00 grams of
water at its boiling point?
(1) 2.26 kJ (3) 4.2 kJ
(2) 3.34 kJ (4) 22.6 kJ
88. Which substance will sublime at 298 K?
(1) CO2 (s) (3) Si(s)
(2) Al(s) (4) KOH(s)
89. An aqueous solution of sodium chloride is best classified as
a
(1) homogeneous compound
(2) homogeneous mixture
(3) heterogeneous compound
(4) heterogeneous mixture
(3)
(4)
90. The graph below represents the uniform heating of a
substance, starting below its melting point, when the
substance is solid.
Which line segments represent an increase in average
kinetic energy?
(1) AB and BC (3) BC and DE
(2) AB and CD (4) DE and EF
91. Water has a higher melting point than hydrogen fluoride.
What is the main reason for this?
(1) Water forms more extensive hydrogen bonds than
hydrogen fluoride.
(2) The covalent bond between O and H is stronger than
that between F and H.
(3) Water contains more ions than hydrogen fluoride.
(4) Water is more polar than hydrogen fluoride.
92. When a mixture of water, sand, and salt is filtered, what
passes through the filter paper?
(1) water, only (3) water and salt, only
(2) water and sand, only (4) water, sand, and salt
93. The table below shows the normal boiling point of four
compounds.
Which compound has the strongest intermolecular forces?
(1) HF(…) (3) CH3F(…) (2) CH3Cl(…) (4) HCl(…)
94. Given the balanced equation:
4Al(s) + 3O 2 (g) 2Al 2 O 3 (s)
What is the total number of moles of O 2 (g) that must react
completely with 8.0 moles of Al(s) in order to form Al
2 O 3 (s)?