Portage Learning- Biochemistry Module
2 Exam Questions & Answers (Grade A+)
*The pH of a solution of 0.0010 M NaOH is:
A. 1
B. 11
C. 8
D. 0
E. 14 -
correct answer ✅B.
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?
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 of the answers are correct -
correct answer ✅E.
,Portage Learning- Biochemistry Module
2 Exam Questions & Answers (Grade A+)
*The bent shape of water is due to ______________.
A. The dipole arrows in a water molecule
B. The electronegativity difference between hydrogen and oxygen
C. The unequal electron sharing between hydrogen and oxygen
D. The unshared electron pairs on the oxygen atom
E. None of the answers are correct -
correct answer ✅D
*Which diagrams correctly represent a hydrogen bond? -
correct answer ✅A & D
, Portage Learning- Biochemistry Module
2 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?
A. 6.86
B. 2.25
C. 5.63
D. 10.12
E. 1.38 -
correct answer ✅B. 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)
2 Exam Questions & Answers (Grade A+)
*The pH of a solution of 0.0010 M NaOH is:
A. 1
B. 11
C. 8
D. 0
E. 14 -
correct answer ✅B.
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?
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 of the answers are correct -
correct answer ✅E.
,Portage Learning- Biochemistry Module
2 Exam Questions & Answers (Grade A+)
*The bent shape of water is due to ______________.
A. The dipole arrows in a water molecule
B. The electronegativity difference between hydrogen and oxygen
C. The unequal electron sharing between hydrogen and oxygen
D. The unshared electron pairs on the oxygen atom
E. None of the answers are correct -
correct answer ✅D
*Which diagrams correctly represent a hydrogen bond? -
correct answer ✅A & D
, Portage Learning- Biochemistry Module
2 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?
A. 6.86
B. 2.25
C. 5.63
D. 10.12
E. 1.38 -
correct answer ✅B. 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)
