1. The pH of a solution of 8.9x10-12 M NaOH is:
a. 8.9
b. 8.9x10 -12
c. 4.8
d. 11
e. 2.9
2. Water is a unique molecule. Which of the following contributes to
water’s unique place in the chemical world?
a. The geometry of the molecule
b. The polarity of the O-H bonds
c. The ability of water molecules to hydrogen bond
d. The bond angle of water
e. All answers are correct
3. What factor contributes to the bent shape of a water molecule?
The two unpaired electrons (valence) in Oxygen atom.
4. Which diagrams correctly represent a hydrogen bond?
a. A and B
b. A and D
c. B and C
d. C and D
e. A and C
5. The H+ concentration of a solution is 5.6x10 -5. What is the pH?
pH= 4.3
6. If the Ka of an acid is 2.67x10-5, what is the pKa?
a. 7.45
b. 12.25
c. 5.26
d. 2.67
e. 4.57
7. List the acids in INCREASING order of strength (weakest to
strongest):
, Nitrous acid (Ka = 4.0 x10-4); acetic acid (Ka = 1.7 x10-5); phosphoric
acid (Ka = 7.3 x10-3)
Acetic acid < Nitrous acid < Phosphoric acid.
8. Elemental bromine (Br2) is a liquid at room temperature. What is
the dominant attractive force that exists between Br2 molecules in
the liquid?
a. Halogen forces
b. Dipole-dipole forces
c. Hydrogen bonds
d. Covalent bonds
e. London forces
9. Which one of the following molecules can form a hydrogen bond?
a. HBr
b. HCl
c. NH3
d. CH4
e. H2
10. A hydrogen bond can form between a hydrogen atom bonded to
nitrogen, N-H, and .
a. C
b. O
c. Cl
d. P
e. Br
11. In a bond between N and Br, there exists a difference in
electronegativity resulting in partial positive and partial negative
charges. If a dipole arrow were to be added to this structure, which
way would the arrow point?
a. The arrow points from Br toward N
b. The arrow points from N toward Br
c. Two arrows; one pointed in each direction
d. There would not be a dipole arrow in this case
e. None of the above
12. The following reaction occurs in glues purchased from hardware
stores. Customers use this product to glue plastic together.
Epoxy (l) + Hardener (l) → Glue (s) + heat given off
What is the sign (+ or -) of the change in ΔG and ΔH?
a. 8.9
b. 8.9x10 -12
c. 4.8
d. 11
e. 2.9
2. Water is a unique molecule. Which of the following contributes to
water’s unique place in the chemical world?
a. The geometry of the molecule
b. The polarity of the O-H bonds
c. The ability of water molecules to hydrogen bond
d. The bond angle of water
e. All answers are correct
3. What factor contributes to the bent shape of a water molecule?
The two unpaired electrons (valence) in Oxygen atom.
4. Which diagrams correctly represent a hydrogen bond?
a. A and B
b. A and D
c. B and C
d. C and D
e. A and C
5. The H+ concentration of a solution is 5.6x10 -5. What is the pH?
pH= 4.3
6. If the Ka of an acid is 2.67x10-5, what is the pKa?
a. 7.45
b. 12.25
c. 5.26
d. 2.67
e. 4.57
7. List the acids in INCREASING order of strength (weakest to
strongest):
, Nitrous acid (Ka = 4.0 x10-4); acetic acid (Ka = 1.7 x10-5); phosphoric
acid (Ka = 7.3 x10-3)
Acetic acid < Nitrous acid < Phosphoric acid.
8. Elemental bromine (Br2) is a liquid at room temperature. What is
the dominant attractive force that exists between Br2 molecules in
the liquid?
a. Halogen forces
b. Dipole-dipole forces
c. Hydrogen bonds
d. Covalent bonds
e. London forces
9. Which one of the following molecules can form a hydrogen bond?
a. HBr
b. HCl
c. NH3
d. CH4
e. H2
10. A hydrogen bond can form between a hydrogen atom bonded to
nitrogen, N-H, and .
a. C
b. O
c. Cl
d. P
e. Br
11. In a bond between N and Br, there exists a difference in
electronegativity resulting in partial positive and partial negative
charges. If a dipole arrow were to be added to this structure, which
way would the arrow point?
a. The arrow points from Br toward N
b. The arrow points from N toward Br
c. Two arrows; one pointed in each direction
d. There would not be a dipole arrow in this case
e. None of the above
12. The following reaction occurs in glues purchased from hardware
stores. Customers use this product to glue plastic together.
Epoxy (l) + Hardener (l) → Glue (s) + heat given off
What is the sign (+ or -) of the change in ΔG and ΔH?
