Portage Learning CHEM 104 Module 3 Exam | General Chemistry II w/ Lab (2026) Actual Q&A PDF

CHEM 104 Module 3 | General Chemistry II w/ Lab Exam
Q&A | Portage Learning
These are original practice questions written for study. They are not official CHEM
104, Portage Learning, or university exam questions and are not copied from any
copyrighted question bank. They cover common CHEM 104 Module 3 | Acids and
Bases topics: acid-base theories, strong vs. weak acids/bases, pH/pOH calculations,
Ka/Kb, buffers, titrations, salt hydrolysis, polyprotic acids, and clinical applications.



Question 1:
According to the Arrhenius definition, an acid is a substance that:
A. Accepts protons
B. Produces H⁺ in water
C. Produces OH⁻ in water
D. Accepts electron pairs

Correct answer: B
Rationale: Arrhenius acids produce H⁺ (hydrogen ions) in aqueous solution.



Question 2:
According to the Arrhenius definition, a base is a substance that:
A. Produces H⁺ in water
B. Produces OH⁻ in water
C. Donates protons
D. Accepts electron pairs

Correct answer: B
Rationale: Arrhenius bases produce OH⁻ (hydroxide ions) in aqueous solution.



Question 3:
According to the Brønsted-Lowry definition, an acid is a:
A. Proton acceptor
B. Proton donor
C. Electron pair acceptor
D. Electron pair donor

Correct answer: B
Rationale: Brønsted-Lowry acids donate protons (H⁺).

,Question 4:
According to the Brønsted-Lowry definition, a base is a:
A. Proton acceptor
B. Proton donor
C. Electron pair acceptor
D. Electron pair donor

Correct answer: A
Rationale: Brønsted-Lowry bases accept protons (H⁺).



Question 5:
According to the Lewis definition, an acid is a:
A. Proton donor
B. Proton acceptor
C. Electron pair acceptor
D. Electron pair donor

Correct answer: C
Rationale: Lewis acids accept electron pairs.



Question 6:
According to the Lewis definition, a base is a:
A. Proton donor
B. Proton acceptor
C. Electron pair acceptor
D. Electron pair donor

Correct answer: D
Rationale: Lewis bases donate electron pairs.



Question 7:
In the reaction HCl + H₂O → H₃O⁺ + Cl⁻, which species is the Brønsted-Lowry acid?
A. HCl
B. H₂O
C. H₃O⁺
D. Cl⁻

Correct answer: A
Rationale: HCl donates a proton to water, so it is the acid.

, Question 8:
In the reaction HCl + H₂O → H₃O⁺ + Cl⁻, which species is the Brønsted-Lowry base?
A. HCl
B. H₂O
C. H₃O⁺
D. Cl⁻

Correct answer: B
Rationale: H₂O accepts a proton from HCl, so it is the base.



Question 9:
In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which species is the Brønsted-Lowry acid?
A. NH₃
B. H₂O
C. NH₄⁺
D. OH⁻

Correct answer: B
Rationale: H₂O donates a proton to NH₃, so it is the acid.



Question 10:
In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which species is the Brønsted-Lowry base?
A. NH₃
B. H₂O
C. NH₄⁺
D. OH⁻

Correct answer: A
Rationale: NH₃ accepts a proton from water, so it is the base.



Question 11:
A conjugate acid-base pair differs by:
A. One electron
B. One proton
C. One neutron
D. One hydroxide ion

Correct answer: B
Rationale: A conjugate acid-base pair differs by one H⁺.