Biochemistry module 2 exam With Question And
Answers (100% Verified answer) Grade A+
Guaranteed: 2025/2026
The pH of a solution of 0.0010 M NaOH is:
1
11
8
0
14 - ANS>>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?
- The geometry of the molecule
- The polarity of the O-H bonds
- The ability of water molecules to hydrogen bond
- The bond angle of water
- All of the answers are correct - ANS>>- All of the answers are correct
The bent shape of water is due to ______________.
- The dipole arrows in a water molecule - - The electronegativity difference between hydrogen
and oxygen
- The unequal electron sharing between hydrogen and oxygen
, - The unshared electron pairs on the oxygen atom
- None of the answers are correct - ANS>>- The unshared electron pairs on the oxygen atom
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-1.20
1.20
3.12
-2.92
2.92 - ANS>>2.92
If the Ka of an acid is 5.63 x 10-3, what is the pKa?
6.86
2.25
5.63
10.12
1.38 - ANS>>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)
- Nitrous acid, acetic acid, phosphoric acid
- Acetic acid, nitrous acid, phosphoric acid
- Phosphoric acid, nitrous acid, acetic acid - Acetic acid, phosphoric acid, nitrous acid
- None of the above - ANS>>- Phosphoric acid, nitrous acid, acetic acid
Answers (100% Verified answer) Grade A+
Guaranteed: 2025/2026
The pH of a solution of 0.0010 M NaOH is:
1
11
8
0
14 - ANS>>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?
- The geometry of the molecule
- The polarity of the O-H bonds
- The ability of water molecules to hydrogen bond
- The bond angle of water
- All of the answers are correct - ANS>>- All of the answers are correct
The bent shape of water is due to ______________.
- The dipole arrows in a water molecule - - The electronegativity difference between hydrogen
and oxygen
- The unequal electron sharing between hydrogen and oxygen
, - The unshared electron pairs on the oxygen atom
- None of the answers are correct - ANS>>- The unshared electron pairs on the oxygen atom
The H+ concentration of a solution is 1.2 x 10-3 M. What is the pH?
-1.20
1.20
3.12
-2.92
2.92 - ANS>>2.92
If the Ka of an acid is 5.63 x 10-3, what is the pKa?
6.86
2.25
5.63
10.12
1.38 - ANS>>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)
- Nitrous acid, acetic acid, phosphoric acid
- Acetic acid, nitrous acid, phosphoric acid
- Phosphoric acid, nitrous acid, acetic acid - Acetic acid, phosphoric acid, nitrous acid
- None of the above - ANS>>- Phosphoric acid, nitrous acid, acetic acid
