Biochemistry M2 Exam Questions and
Answers Already Passed
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)
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
The bent shape of water is due to ______________.
The unshared electron pairs on the oxygen atom
Which diagrams correctly represent a hydrogen bond?
A and D
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
2.92
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])
, 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
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
Which one of the following molecules can form a hydrogen bond? (A.) HBr (B.) HCl (C.) NH3
(D.) CH4 (E.) H2
C. NH3
A hydrogen bond can form between a hydrogen atom bonded to oxygen, O-H, and ________.
N
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 structure, which way
would the arrow point?
The arrow points from N toward Br
Answers Already Passed
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)
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
The bent shape of water is due to ______________.
The unshared electron pairs on the oxygen atom
Which diagrams correctly represent a hydrogen bond?
A and D
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
2.92
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])
, 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
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
Which one of the following molecules can form a hydrogen bond? (A.) HBr (B.) HCl (C.) NH3
(D.) CH4 (E.) H2
C. NH3
A hydrogen bond can form between a hydrogen atom bonded to oxygen, O-H, and ________.
N
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 structure, which way
would the arrow point?
The arrow points from N toward Br
