, CHEM 210 | Module 2 | Original Biochemistry Practice
CHEM 210 Module 2 Exam | Biochemistry | Portage
| Q & A | 26/27 Actual (PDF)
1. Which statement best describes neutral water in CHEM 210 Module 2?
A) Neutral water contains no ions
B) At 25 C, neutral water has equal hydronium and hydroxide concentrations of 1.0 x 10^-7 M.
C) Neutrality means [H3O+] exceeds [OH-]D) Neutral water has pH 0
Correct Answer: At 25 C, neutral water has equal hydronium and hydroxide concentrations of 1.0 x 10^-7 M.
Rationale: At 25 C, neutral water has equal hydronium and hydroxide concentrations of 1.0 x 10^-7 M. This concept
aligns with Portage Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and biological buffer
systems.
2. Which statement best describes carbonic acid equilibrium in CHEM 210 Module 2?
A) Carbonic Acid Equilibrium is unrelated to aqueous biochemistry or buffering.
B) Carbon dioxide, water, carbonic acid, bicarbonate, and hydrogen ion participate in a reversible buffer
equilibrium.
C) Carbonic Acid Equilibrium can be explained without considering charge, polarity, or equilibrium.
D) Carbonic Acid Equilibrium has the opposite chemical effect from the definition given.
Correct Answer: Carbon dioxide, water, carbonic acid, bicarbonate, and hydrogen ion participate in a
reversible buffer equilibrium.
Rationale: Carbon dioxide, water, carbonic acid, bicarbonate, and hydrogen ion participate in a reversible buffer
equilibrium. This concept aligns with Portage Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and
biological buffer systems.
3. Which statement best describes water cohesion in CHEM 210 Module 2?
A) Cohesion is attraction among water molecules and contributes to surface tension.
B) Water Cohesion is unrelated to aqueous biochemistry or buffering.
C) Water Cohesion can be explained without considering charge, polarity, or equilibrium.
D) Water Cohesion has the opposite chemical effect from the definition given.
Correct Answer: Cohesion is attraction among water molecules and contributes to surface tension.
Rationale: Cohesion is attraction among water molecules and contributes to surface tension. This concept aligns
with Portage Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and biological buffer systems.
4. Which statement best describes pH in CHEM 210 Module 2?
A) pH has no logarithmic basis
B) Higher hydronium always means higher pH
C) pH equals -log[H3O+].
D) pH equals log[H3O+]
Correct Answer: pH equals -log[H3O+].
Rationale: pH equals -log[H3O+]. This concept aligns with Portage Module 2's official focus on water, aqueous
chemistry, pH, Ka/pKa, and biological buffer systems.
Page 2
, CHEM 210 | Module 2 | Original Biochemistry Practice
5. A student is solving an aqueous acid-base problem involving conjugate acid-base pair.
Whichinterpretation is correct?
A) A conjugate acid-base pair differs by exactly one proton.
B) Conjugate Acid-Base Pair has the opposite chemical effect from the definition given.
C) Conjugate Acid-Base Pair can be explained without considering charge, polarity, or equilibrium.
D) Conjugate Acid-Base Pair is unrelated to aqueous biochemistry or buffering.
Correct Answer: A conjugate acid-base pair differs by exactly one proton.
Rationale: A conjugate acid-base pair differs by exactly one proton. Apply the acid-base equilibrium definition and
logarithmic relationships carefully, using consistent concentrations and equilibrium expressions.
6. Which statement best describes hydroxide from pOH in CHEM 210 Module 2?
A) Hydroxide From Poh can be explained without considering charge, polarity, or equilibrium.
B) Hydroxide From Poh is unrelated to aqueous biochemistry or buffering.
C) Hydroxide From Poh has the opposite chemical effect from the definition given.
D) Hydroxide concentration is found from pOH using [OH-] = 10^(-pOH).
Correct Answer: Hydroxide concentration is found from pOH using [OH-] = 10^(-pOH).
Rationale: Hydroxide concentration is found from pOH using [OH-] = 10^(-pOH). This concept aligns with Portage
Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and biological buffer systems.
7. A molecule or solution is being analyzed for water-related behavior. Which statement about
hydrogenbonding is most accurate?
A) Hydrogen bonding requires no electronegative atoms
B) Hydrogen bonds form when a hydrogen attached to an electronegative atom such as oxygen interacts
with a lonepair on another electronegative atom.
C) Hydrogen bonds occur only between nonpolar molecules
D) Hydrogen bonding is a covalent bond within a water molecule
Correct Answer: Hydrogen bonds form when a hydrogen attached to an electronegative atom such as oxygen
interacts with a lone pair on another electronegative atom.
Rationale: Hydrogen bonds form when a hydrogen attached to an electronegative atom such as oxygen interacts
with a lone pair on another electronegative atom. Water's unusual physical and solvent properties follow from its
bent geometry, polarity, and extensive hydrogen bonding.
8. A student is solving an aqueous acid-base problem involving Kb. Which interpretation is correct?
A) Kb is the base dissociation constant and quantifies the extent to which a weak base accepts protons.
B) Kb has the opposite chemical effect from the definition given.
C) Kb is unrelated to aqueous biochemistry or buffering.
D) Kb can be explained without considering charge, polarity, or equilibrium.
Correct Answer: Kb is the base dissociation constant and quantifies the extent to which a weak base accepts
protons.
Rationale: Kb is the base dissociation constant and quantifies the extent to which a weak base accepts protons.
Apply the acid-base equilibrium definition and logarithmic relationships carefully, using consistent concentrations
and equilibrium expressions.
9. A molecule or solution is being analyzed for water-related behavior. Which statement about high
heat ofvaporization is most accurate?
Page 3
CHEM 210 Module 2 Exam | Biochemistry | Portage
| Q & A | 26/27 Actual (PDF)
1. Which statement best describes neutral water in CHEM 210 Module 2?
A) Neutral water contains no ions
B) At 25 C, neutral water has equal hydronium and hydroxide concentrations of 1.0 x 10^-7 M.
C) Neutrality means [H3O+] exceeds [OH-]D) Neutral water has pH 0
Correct Answer: At 25 C, neutral water has equal hydronium and hydroxide concentrations of 1.0 x 10^-7 M.
Rationale: At 25 C, neutral water has equal hydronium and hydroxide concentrations of 1.0 x 10^-7 M. This concept
aligns with Portage Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and biological buffer
systems.
2. Which statement best describes carbonic acid equilibrium in CHEM 210 Module 2?
A) Carbonic Acid Equilibrium is unrelated to aqueous biochemistry or buffering.
B) Carbon dioxide, water, carbonic acid, bicarbonate, and hydrogen ion participate in a reversible buffer
equilibrium.
C) Carbonic Acid Equilibrium can be explained without considering charge, polarity, or equilibrium.
D) Carbonic Acid Equilibrium has the opposite chemical effect from the definition given.
Correct Answer: Carbon dioxide, water, carbonic acid, bicarbonate, and hydrogen ion participate in a
reversible buffer equilibrium.
Rationale: Carbon dioxide, water, carbonic acid, bicarbonate, and hydrogen ion participate in a reversible buffer
equilibrium. This concept aligns with Portage Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and
biological buffer systems.
3. Which statement best describes water cohesion in CHEM 210 Module 2?
A) Cohesion is attraction among water molecules and contributes to surface tension.
B) Water Cohesion is unrelated to aqueous biochemistry or buffering.
C) Water Cohesion can be explained without considering charge, polarity, or equilibrium.
D) Water Cohesion has the opposite chemical effect from the definition given.
Correct Answer: Cohesion is attraction among water molecules and contributes to surface tension.
Rationale: Cohesion is attraction among water molecules and contributes to surface tension. This concept aligns
with Portage Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and biological buffer systems.
4. Which statement best describes pH in CHEM 210 Module 2?
A) pH has no logarithmic basis
B) Higher hydronium always means higher pH
C) pH equals -log[H3O+].
D) pH equals log[H3O+]
Correct Answer: pH equals -log[H3O+].
Rationale: pH equals -log[H3O+]. This concept aligns with Portage Module 2's official focus on water, aqueous
chemistry, pH, Ka/pKa, and biological buffer systems.
Page 2
, CHEM 210 | Module 2 | Original Biochemistry Practice
5. A student is solving an aqueous acid-base problem involving conjugate acid-base pair.
Whichinterpretation is correct?
A) A conjugate acid-base pair differs by exactly one proton.
B) Conjugate Acid-Base Pair has the opposite chemical effect from the definition given.
C) Conjugate Acid-Base Pair can be explained without considering charge, polarity, or equilibrium.
D) Conjugate Acid-Base Pair is unrelated to aqueous biochemistry or buffering.
Correct Answer: A conjugate acid-base pair differs by exactly one proton.
Rationale: A conjugate acid-base pair differs by exactly one proton. Apply the acid-base equilibrium definition and
logarithmic relationships carefully, using consistent concentrations and equilibrium expressions.
6. Which statement best describes hydroxide from pOH in CHEM 210 Module 2?
A) Hydroxide From Poh can be explained without considering charge, polarity, or equilibrium.
B) Hydroxide From Poh is unrelated to aqueous biochemistry or buffering.
C) Hydroxide From Poh has the opposite chemical effect from the definition given.
D) Hydroxide concentration is found from pOH using [OH-] = 10^(-pOH).
Correct Answer: Hydroxide concentration is found from pOH using [OH-] = 10^(-pOH).
Rationale: Hydroxide concentration is found from pOH using [OH-] = 10^(-pOH). This concept aligns with Portage
Module 2's official focus on water, aqueous chemistry, pH, Ka/pKa, and biological buffer systems.
7. A molecule or solution is being analyzed for water-related behavior. Which statement about
hydrogenbonding is most accurate?
A) Hydrogen bonding requires no electronegative atoms
B) Hydrogen bonds form when a hydrogen attached to an electronegative atom such as oxygen interacts
with a lonepair on another electronegative atom.
C) Hydrogen bonds occur only between nonpolar molecules
D) Hydrogen bonding is a covalent bond within a water molecule
Correct Answer: Hydrogen bonds form when a hydrogen attached to an electronegative atom such as oxygen
interacts with a lone pair on another electronegative atom.
Rationale: Hydrogen bonds form when a hydrogen attached to an electronegative atom such as oxygen interacts
with a lone pair on another electronegative atom. Water's unusual physical and solvent properties follow from its
bent geometry, polarity, and extensive hydrogen bonding.
8. A student is solving an aqueous acid-base problem involving Kb. Which interpretation is correct?
A) Kb is the base dissociation constant and quantifies the extent to which a weak base accepts protons.
B) Kb has the opposite chemical effect from the definition given.
C) Kb is unrelated to aqueous biochemistry or buffering.
D) Kb can be explained without considering charge, polarity, or equilibrium.
Correct Answer: Kb is the base dissociation constant and quantifies the extent to which a weak base accepts
protons.
Rationale: Kb is the base dissociation constant and quantifies the extent to which a weak base accepts protons.
Apply the acid-base equilibrium definition and logarithmic relationships carefully, using consistent concentrations
and equilibrium expressions.
9. A molecule or solution is being analyzed for water-related behavior. Which statement about high
heat ofvaporization is most accurate?
Page 3
