Biochemistry M2 Exam Questions &
Answers (Grade A+)
The pH of a solution of 0.0010 M NaOH is: -
correct answer ✅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? -
correct answer ✅All of the answers are correct
The bent shape of water is due to ______________. -
correct answer ✅The unshared electron pairs on the oxygen atom
Which diagrams correctly represent a hydrogen bond? -
correct answer ✅A and D
, Biochemistry M2 Exam Questions &
Answers (Grade A+)
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-
correct answer ✅2.92
If the Ka of an acid is 5.63 x 10-3, what is the pKa? -
correct answer ✅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) -
correct answer ✅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? -
correct answer ✅London forces
Which one of the following molecules can form a hydrogen bond?
(A.) HBr (B.) HCl (C.) NH3 (D.) CH4 (E.) H2 -
correct answer ✅C. NH3
Answers (Grade A+)
The pH of a solution of 0.0010 M NaOH is: -
correct answer ✅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? -
correct answer ✅All of the answers are correct
The bent shape of water is due to ______________. -
correct answer ✅The unshared electron pairs on the oxygen atom
Which diagrams correctly represent a hydrogen bond? -
correct answer ✅A and D
, Biochemistry M2 Exam Questions &
Answers (Grade A+)
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-
correct answer ✅2.92
If the Ka of an acid is 5.63 x 10-3, what is the pKa? -
correct answer ✅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) -
correct answer ✅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? -
correct answer ✅London forces
Which one of the following molecules can form a hydrogen bond?
(A.) HBr (B.) HCl (C.) NH3 (D.) CH4 (E.) H2 -
correct answer ✅C. NH3
