CHEM 210 – BIOCHEMISTRY MODULE 2
EXAM QUESTIONS AND ANSWERS PASS
GUARANTEED 100% ✅
1. The pH of a solution of 3.2 x 10⁻¹⁰ M NaOH is:
A. 3.7
B. 3.7 x 10⁻¹⁰
C. 4.5 ✅
D. 13
E. 8.7
Explanation: Use Kw=[OH−][H+]\text{Kw} = [OH⁻][H⁺], then pH=−log[H+]pH = -\log[H⁺]
2. Which attribute contributes to water’s unusual properties?
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 ✅
Explanation: Water's bent shape, polarity, and H-bonding contribute to its high boiling point
and other anomalies
3. What factor contributes to the bent shape of a water molecule?
✅ Unshared electron pairs on the oxygen atom
@2025 Exam Material 1
, 4. Which diagrams correctly represent a hydrogen bond?
✅ A and D
Explanation: Hydrogen bond donors: OH, NH, FH; Acceptors: O, N
5. The H⁺ concentration of a solution is 5.6 x 10⁻⁵. What is the pH?
✅ 4.25
Explanation: pH=−log[H+]pH = -\log[H⁺]
6. If the Ka of an acid is 7.45 x 10⁻¹⁰, what is the pKa?
✅ 9.13
Explanation: pKa=−log(Ka)pKa = -\log(Ka)
7. List the acids in INCREASING order of strength:
• Nitrous acid (Ka = 4.0 x 10⁻⁴)
• Acetic acid (Ka = 1.7 x 10⁻⁵)
• Phosphoric acid (Ka = 7.3 x 10⁻³)
✅ Answer: Acetic acid < Nitrous acid < Phosphoric acid
Explanation: Larger Ka = stronger acid
8. What is the dominant attractive force between Br₂ molecules in liquid form?
✅ London dispersion forces
Explanation: Temporary partial charges from electron movement
9. Which one of the following molecules can form a hydrogen bond?
A. HI
B. HCl
C. N₂
@2025 Exam Material 2
EXAM QUESTIONS AND ANSWERS PASS
GUARANTEED 100% ✅
1. The pH of a solution of 3.2 x 10⁻¹⁰ M NaOH is:
A. 3.7
B. 3.7 x 10⁻¹⁰
C. 4.5 ✅
D. 13
E. 8.7
Explanation: Use Kw=[OH−][H+]\text{Kw} = [OH⁻][H⁺], then pH=−log[H+]pH = -\log[H⁺]
2. Which attribute contributes to water’s unusual properties?
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 ✅
Explanation: Water's bent shape, polarity, and H-bonding contribute to its high boiling point
and other anomalies
3. What factor contributes to the bent shape of a water molecule?
✅ Unshared electron pairs on the oxygen atom
@2025 Exam Material 1
, 4. Which diagrams correctly represent a hydrogen bond?
✅ A and D
Explanation: Hydrogen bond donors: OH, NH, FH; Acceptors: O, N
5. The H⁺ concentration of a solution is 5.6 x 10⁻⁵. What is the pH?
✅ 4.25
Explanation: pH=−log[H+]pH = -\log[H⁺]
6. If the Ka of an acid is 7.45 x 10⁻¹⁰, what is the pKa?
✅ 9.13
Explanation: pKa=−log(Ka)pKa = -\log(Ka)
7. List the acids in INCREASING order of strength:
• Nitrous acid (Ka = 4.0 x 10⁻⁴)
• Acetic acid (Ka = 1.7 x 10⁻⁵)
• Phosphoric acid (Ka = 7.3 x 10⁻³)
✅ Answer: Acetic acid < Nitrous acid < Phosphoric acid
Explanation: Larger Ka = stronger acid
8. What is the dominant attractive force between Br₂ molecules in liquid form?
✅ London dispersion forces
Explanation: Temporary partial charges from electron movement
9. Which one of the following molecules can form a hydrogen bond?
A. HI
B. HCl
C. N₂
@2025 Exam Material 2
