BioChem 210 Module 2 Exam - Portage
Learning
1. The pH of a solution of 0.0010 M NaOH is:: 11 (Kw=[H+][OH-] =
1.0 x 10-14;
[H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11; pH=-log[1.0 x 10-
11]=11)
2. Water is a unique molecule. Which of the following
contributes to water's unique place in the chemical world?:
All of the answers are correct
3. The bent shape of water is due to ______________.: The
unshared electron pairs on the oxygen atom
4. Which diagrams correctly represent a hydrogen bond?: A
and D
5. The H+ concentration of a solution is 1.2 x 10-3 M. What is
the pH?: 2.92
, 6. If the Ka of an acid is 5.63 x 10-3, what is the pKa?: 2.25 ([pKa
= -log(5.63 x 10-3) = 2.25])
7. List the acids in DECREASING order of strength (strongest to
weakest):
Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5);
phosphoric acid
(Ka = 7.3 x 10-3): Phosphoric acid, nitrous acid, acetic acid
8. Elemental iodine (I2) is a solid at room temperature. What is
the dominant attractive force that exists between I2
molecules in the solid?: London forces 9. Which one of the
following molecules can form a hydrogen bond? (A.) HBr
(B.) HCl (C.) NH3 (D.) CH4 (E.) H2: C. NH3
10. A hydrogen bond can form between a hydrogen atom
bonded to oxygen,
O-H, and ________.: N
11. In a bond between P and Cl, there exists a difference in
electronegativity resulting in partial positive and partial
negative charges. If a dipole arrow were added to this
Learning
1. The pH of a solution of 0.0010 M NaOH is:: 11 (Kw=[H+][OH-] =
1.0 x 10-14;
[H+][0.0010] = 1.0 x 10-14 [H+]=1.0 x 10-11; pH=-log[1.0 x 10-
11]=11)
2. Water is a unique molecule. Which of the following
contributes to water's unique place in the chemical world?:
All of the answers are correct
3. The bent shape of water is due to ______________.: The
unshared electron pairs on the oxygen atom
4. Which diagrams correctly represent a hydrogen bond?: A
and D
5. The H+ concentration of a solution is 1.2 x 10-3 M. What is
the pH?: 2.92
, 6. If the Ka of an acid is 5.63 x 10-3, what is the pKa?: 2.25 ([pKa
= -log(5.63 x 10-3) = 2.25])
7. List the acids in DECREASING order of strength (strongest to
weakest):
Nitrous acid (Ka = 4.0 x 10-4); acetic acid (Ka = 1.7 x 10-5);
phosphoric acid
(Ka = 7.3 x 10-3): Phosphoric acid, nitrous acid, acetic acid
8. Elemental iodine (I2) is a solid at room temperature. What is
the dominant attractive force that exists between I2
molecules in the solid?: London forces 9. Which one of the
following molecules can form a hydrogen bond? (A.) HBr
(B.) HCl (C.) NH3 (D.) CH4 (E.) H2: C. NH3
10. A hydrogen bond can form between a hydrogen atom
bonded to oxygen,
O-H, and ________.: N
11. In a bond between P and Cl, there exists a difference in
electronegativity resulting in partial positive and partial
negative charges. If a dipole arrow were added to this
