Chemistry (Chang), 10th Edition

Chapter 12: Physical Properties of Solutions

Self Assessment B

1
The most significant force between solute particles in an aqueous MgCl2 solution is
A)charge-charge interaction
B)charge-dipole interaction
C)van der Waals interaction
D)hydrogen bonding
2
Which of the following liquids would make a good solvent for bromine, Br2?
A)HCl(g)
B)H2O(l)
C)CS2(l)
D)NH3(g)
E)CH3OH(l)
3
What is the sulfate ion concentration in a 12 M aqueous solution of Mn(SO4) 2?
A)12 M
B)24 M
C)36 M
D)48 M
E)None of the above.
4
Calculate the molar concentration of a sulfuric acid solution containing 23.0% by mass of H2SO4. The solution density is 1.398 g/cm3.
A)5.96 M
B)0.328 M
C)0.596 M
D)3.28 M
E)None of the above.
5
The molality of a solution of ethyl alcohol, (C2H5OH) in water is 0.960 mol/kg. How many grams of alcohol are dissolved in 5.98 kg of water?
A)5.74 g
B)287 g
C)74.1 g
D)265 g
E)740 g
6
What change would you predict in the solubility of N2(g) in water if the temperature changes from 20 oC to 80 oC?
A)Less N2 would dissolve.
B)More N2 would dissolve.
C)The solubility of N2 would not change
D)Some specific information about N2 would have to be given before its solubility characteristics can be determined.
7
The freezing point of pure camphor is 178.4 oC, and its molal freezing-point constant, Kf, is 40.0 oC/m. Find the freezing point of a solution containing 3.00 g of a compound (molar mass = 125 g/mol) dissolved in 45.0 g of camphor.
A)174.1 oC
B)157oC
C)135.2 oC
D)140oC
E)21.3 oC
8
The osmotic pressure of a 0.82 M HCl solution is 35.9 atm at 18 oC. Calculate the van't Hoff factor for HCl at this concentration.
A)1.8
B)17.2
C)1.5
D)2.00
9
Colloidal particles are ______ solute molecules.
A)larger than
B)smaller than
C)the same size as
D)either smaller than or larger than
10
Which of the following is not an example of a hydrophilic group that can be attached to the surface of a large molecule?
A)-COO-
B)-OH
C)-NH3+
D)-CH3
E)-NH2
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