CHEM 121 Module 4 | Foundations of General Chemistry
w/Lab Exam Q&A | Portage Learning
These are original practice questions written for study. They cover common CHEM 121
Module 4 | Aqueous Reactions and Solution Chemistry topics: solutions, electrolytes,
solubility, precipitation reactions, net ionic equations, acid-base reactions, oxidation-
reduction reactions, molarity, dilution, solution stoichiometry, and clinical applications,
with NCLEX-style framing.
Question 1:
Which of the following is the best definition of a solution?
A. A heterogeneous mixture of two or more substances
B. A homogeneous mixture of two or more substances
C. A pure substance composed of one element
D. A compound formed by a chemical reaction
Correct answer: B
Rationale: A solution is a homogeneous mixture with uniform composition throughout.
Question 2:
In a solution of salt water, the salt is the:
A. Solvent
B. Solute
C. Precipitate
D. Catalyst
Correct answer: B
Rationale: The solute is the substance dissolved in the solvent; salt is dissolved in
water.
Question 3:
In a solution of salt water, the water is the:
A. Solute
B. Solvent
C. Precipitate
D. Electrolyte
,Correct answer: B
Rationale: The solvent is the substance present in the larger amount that dissolves the
solute.
Question 4:
Which of the following is an aqueous solution?
A. NaCl dissolved in water
B. NaCl dissolved in alcohol
C. NaCl in solid form
D. NaCl dissolved in oil
Correct answer: A
Rationale: An aqueous solution has water as the solvent.
Question 5:
A strong electrolyte is a substance that:
A. Dissolves in water but does not conduct electricity
B. Completely dissociates into ions in water
C. Partially dissociates into ions in water
D. Does not dissolve in water
Correct answer: B
Rationale: Strong electrolytes completely dissociate into ions and conduct electricity
well.
Question 6:
A weak electrolyte is a substance that:
A. Completely dissociates into ions in water
B. Partially dissociates into ions in water
C. Does not conduct electricity
D. Does not dissolve in water
Correct answer: B
Rationale: Weak electrolytes partially ionize in water and conduct electricity weakly.
Question 7:
A nonelectrolyte is a substance that:
A. Completely dissociates into ions in water
B. Partially dissociates into ions in water
, C. Dissolves in water but does not conduct electricity
D. Does not dissolve in water
Correct answer: C
Rationale: Nonelectrolytes dissolve as neutral molecules and do not conduct
electricity.
Question 8:
Which of the following is a strong electrolyte?
A. NaCl
B. Glucose
C. Ethanol
D. Sucrose
Correct answer: A
Rationale: NaCl completely dissociates into Na⁺ and Cl⁻ ions in water.
Question 9:
Which of the following is a weak electrolyte?
A. NaCl
B. HCl
C. CH₃COOH (acetic acid)
D. KOH
Correct answer: C
Rationale: Acetic acid only partially ionizes in water.
Question 10:
Which of the following is a nonelectrolyte?
A. NaCl
B. KCl
C. Glucose
D. HCl
Correct answer: C
Rationale: Glucose dissolves as neutral molecules and does not conduct electricity.
Question 11:
Which of the following is a strong acid?
w/Lab Exam Q&A | Portage Learning
These are original practice questions written for study. They cover common CHEM 121
Module 4 | Aqueous Reactions and Solution Chemistry topics: solutions, electrolytes,
solubility, precipitation reactions, net ionic equations, acid-base reactions, oxidation-
reduction reactions, molarity, dilution, solution stoichiometry, and clinical applications,
with NCLEX-style framing.
Question 1:
Which of the following is the best definition of a solution?
A. A heterogeneous mixture of two or more substances
B. A homogeneous mixture of two or more substances
C. A pure substance composed of one element
D. A compound formed by a chemical reaction
Correct answer: B
Rationale: A solution is a homogeneous mixture with uniform composition throughout.
Question 2:
In a solution of salt water, the salt is the:
A. Solvent
B. Solute
C. Precipitate
D. Catalyst
Correct answer: B
Rationale: The solute is the substance dissolved in the solvent; salt is dissolved in
water.
Question 3:
In a solution of salt water, the water is the:
A. Solute
B. Solvent
C. Precipitate
D. Electrolyte
,Correct answer: B
Rationale: The solvent is the substance present in the larger amount that dissolves the
solute.
Question 4:
Which of the following is an aqueous solution?
A. NaCl dissolved in water
B. NaCl dissolved in alcohol
C. NaCl in solid form
D. NaCl dissolved in oil
Correct answer: A
Rationale: An aqueous solution has water as the solvent.
Question 5:
A strong electrolyte is a substance that:
A. Dissolves in water but does not conduct electricity
B. Completely dissociates into ions in water
C. Partially dissociates into ions in water
D. Does not dissolve in water
Correct answer: B
Rationale: Strong electrolytes completely dissociate into ions and conduct electricity
well.
Question 6:
A weak electrolyte is a substance that:
A. Completely dissociates into ions in water
B. Partially dissociates into ions in water
C. Does not conduct electricity
D. Does not dissolve in water
Correct answer: B
Rationale: Weak electrolytes partially ionize in water and conduct electricity weakly.
Question 7:
A nonelectrolyte is a substance that:
A. Completely dissociates into ions in water
B. Partially dissociates into ions in water
, C. Dissolves in water but does not conduct electricity
D. Does not dissolve in water
Correct answer: C
Rationale: Nonelectrolytes dissolve as neutral molecules and do not conduct
electricity.
Question 8:
Which of the following is a strong electrolyte?
A. NaCl
B. Glucose
C. Ethanol
D. Sucrose
Correct answer: A
Rationale: NaCl completely dissociates into Na⁺ and Cl⁻ ions in water.
Question 9:
Which of the following is a weak electrolyte?
A. NaCl
B. HCl
C. CH₃COOH (acetic acid)
D. KOH
Correct answer: C
Rationale: Acetic acid only partially ionizes in water.
Question 10:
Which of the following is a nonelectrolyte?
A. NaCl
B. KCl
C. Glucose
D. HCl
Correct answer: C
Rationale: Glucose dissolves as neutral molecules and does not conduct electricity.
Question 11:
Which of the following is a strong acid?
