Olympic High School  AP Chemistry
____________________________________
5.Name
If the
pressure of a gas over a liquid increases, the
Period ___ Date ___/___/___
amount of gas dissolved in the liquid will
14  Solutions
PRACTICE
TEST
a) increase
b) decrease
c) remain the same
d) have a higher vapor pressure
1.
Hydrobromic acid (molar mass = 80.9 g/mol) is
e) depends on the polarity of the gas
commercially available in a 34.0 mass percent
solution which has a density of 1.31 g/cm3. What
is the molarity of the commercially available
hydrobromic acid?
6. What is the primary energetic factor responsible for
the lack of miscibility between CCl4(l) and water?
a) the strength of intermolecular forces between
a) 2.75 M
d) 9.35 M
b) 4.45 M
e) 10.2 M
c) 5.50 M
CCl4 molecules
b) the strength of intermolecular forces between
H2O molecules
c) the charge on the C atom in CCl4
2.
A student prepared a solution containing 0.30 mol
solute and 1.00 mole solvent. The mole fraction
of solvent is
d) the difference between the molecular weights
of the molecules
e) the electronegativity difference between
a) 1.30
d) 0.30
b) 1.00
e) 0.23
carbon and chlorine
c) 0.77
3.
A chemist knows the empirical formula of a new
compound but not the molecular formula. What
must be determined experimentally so that the
molecular formula can be determined?
a) density
d) melting point
b) viscosity
e) molar mass
c) % composition
4.
A volumetric flask is necessary for the preparation
of which one of the following concentration
measurements?
a) molality
d) molarity
b) X
e) ppm
c) mass %
7. The aqueous solubilities of several compounds
between temperatures of 0 °C and 80 °C are
shown in this diagram. Which compound can be
recovered with the highest percent yield by
dissolving a sample in water at 80 °C and cooling
to 0 °C?
a) A
b) B
c) C
d) D
8. What is the molarity of the chloride ion in 250
mL of a solution containing 1.90 g of MgCl2?
(The molar mass of MgCl2 is 95.2 g mol¯1
a) 0.020 M
b) 0.040 M
c) 0.080 M
d) 0.16 M
9. Which gas is most soluble in water?
a) ammonia (NH3)
b) hydrogen (H2)
c) methane (CH4)
d) nitrogen (N2)
10. A student wants to prepare 250. mL of 0.10 M
NaCl solution. Which procedure is most
appropriate? (The molar mass of NaCl is 58.4
g mol¯1)
a) Add 5.84 g of NaCl to 250. mL of
H2O
b) Add 1.46 g of NaCl to 250. mL of
H2O
c) Dissolve 5.84 g of NaCl in 50 mL of
H2O and dilute to 250. mL.
d) Dissolve 1.46 g of NaCl in 50 mL of
H2O and dilute to 250. mL.
11. Which compound is most soluble in water?
a) ethylamine (CH3NH2)
b) chlorobenzene (C6H5Cl)
c) methyl acetate (CH3OO CH3)
d) pentane (C5H12)
12. Which gas is least soluble in water?
(A) H2
(B) CO2
(C) NH3
(D) SO2
13. When Na2S2O3 . 3H2O dissolve in water, the
solution gets cold. Which energy diagram best
represents the behavior of this solution process?