Name ____________________________
Chem 21A
Noncovalent forces and solutions quiz (take home)
1) What types of molecules participate in dipole-dipole interactions?
A) all molecules participate in dipole-dipole attractions
B) only molecules with permanent dipoles
C) molecules that can be easily polarized
D) only molecules with hydrogens attached to oxygen, nitrogen, or fluorine
2) Which of the following molecules can hydrogen bond with themselves (there may be more than one correct
answer)?
A) CH3OH
B) HI
C) H2 S
D) CH2O
E) NH3
3) Which of the following molecules can participate in solvent-solute hydrogen bonding in an aqueous solution
(there may be more than one correct answer)?
A) CH3OH
B) HI
C) H2 S
D) CH2O
E) NH3
4) Draw the structures of the molecules you chose in the previous question. For each, label the hydrogen bond
donor and acceptor sites.
5) Ions dissolved in water interact with the water mainly through
A) dispersion forces.
B) dipole-dipole interactions.
C) hydrogen bonding.
D) ion-dipole interactions.
E) ionic bonding.
6) Which of the following compounds will have the highest boiling point?
A) CH3CH2 CH2CH2 CH2CH3
B) CH3CH2 CH3
D) CH3CH2 CH2CH3
C) CH3CH2 CH2CH2 CH3
7) Rank the following compounds in order of increasing boiling points.
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8) Rank the following compounds in order of increasing boiling points.
CH3OH
CO2
CH2O
Ne
(formaldehyde)
9) How does the strength of intermolecular forces affect a liquids vapor pressure?
A) Larger intermolecular forces decrease the number of molecules that can escape the liquid, decreasing
vapor pressure.
B) Smaller intermolecular forces decrease the number of molecules that can escape the liquid, decreasing the
vapor pressure.
C) Smaller intermolecular forces increase the number of molecules that can escape, decreasing the vapor
pressure.
D) Larger intermolecular forces increase the number of molecules that can escape, increasing the vapor
pressure.
10) A volatile liquid has a ________________ vapor pressure and evaporates _______________________.
11) Define the following two terms:
boiling point:
normal boiling point:
12) Diagram a heating curve for water starting with ice at -10 °C and finishing with steam at 110 °C. Label each
axis and what is occuring at each segment of the graph (for example: temperature of water is increasing as heat
is added).
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13) Which of the following pairs of liquids will be miscible?
A) Water and hexane (C6H14)
C) Octane (C8 H18) and methanol (CH3 OH)
B) Water and carbon tetrachloride (CCl4)
D) Acetone [(CH3)2 C=O] and methanol (CH3 OH)
14) Which of the following pairs of liquids will be immiscible?
A) octane (C8 H18) and nonane (C9 H20)
C) fomaldehyde (CH2O) and methanol (CH3OH)
B) water and fomaldehyde (CH2O)
D) acetic acid (CH3 COOH) and hexane (C6H14)
15) What is the molarity of a solution that contains 6.51 g of ammonia (17.034 g/mol) in 1.310 L of solution?
A) 0.292 M
B) 0.279 M
C) 1.00 M
D) 29.2 M
E) 0.202 M
16) How many grams of sodium chloride (58.44 g/mol) are required to make 0.200 L of a solution with a
concentration of 5.10 M?
A) 5.961 g
B) 62.9 g
C) 0.200 g
D) 59.6 g
E) 1.00 g
17) How many mL of a 2.50 M NaOH solution contains 0.0511 moles of NaOH?
A) 764 mL
B) 222 mL
C) 173 mL
D) 0.578 mL
E) 20.4 mL
18) How many mL of a 15.0% (m/v) solution of glucose, will provide 2.5 g of glucose?
A) 0.667 mL
B) 4.53 mL
C) 16.7 mL
D) 67.7 mL
19) Which of the following is NOT a colligative property?
A) osmotic pressure
C) solution saturation
B) boiling point elevation
D) freezing point depression
20) List two ways to increase the boiling point of water while remaining at sea level.
21) A red blood cell wil crenate (shrivel up) if it is placed in:
A) a hypertonic solution
C) distilled water
B) a hypotonic solution
D) an isotonic solution
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E) 92.0 mL