HESI A2 CHEMISTRY PRACTICE QUESTIONS AND ANSWERS 2025 |
COMPREHENSIVE STUDY GUIDE
Latest Update
Prepare to ace the HESI A2 Chemistry exam with our expertly designed online quiz featuring
25 practice questions and detailed answers!!!
Question 1:
What is the correct formula for silver hydroxide?
• (A) AgO2
• ✅ (B) AgOH
• (C) AgOH2
• (D) AgH2O
Correct Answer: (B) AgOH
Rationale: Silver hydroxide consists of one silver (Ag) atom bonded to one hydroxide (OH)
group. The correct formula is AgOH.
Quick Tip: When naming or writing formulas for hydroxides, the metal is followed by OH
(hydroxide).
Question 2:
A salt solution has a molarity of 1.5 M. How many moles of this salt are present in 2.0 L of
this solution?
• (A) 0.75
• (B) 1.5
• (C) 2.0
• ✅ (D) 3.0
Correct Answer: (D) 3.0
Rationale: Molarity (M) is defined as moles of solute per liter of solution. To find the moles of
salt, multiply the molarity by the volume of the solution:
1.5 M × 2.0 L = 3.0 moles.
Quick Tip: Molarity (M) = moles of solute / liters of solution. Multiply M × L to find the moles
of solute.
, Question 3:
Which of these types of intermolecular force is strongest?
• (A) Dipole-dipole interaction
• (B) London dispersion force
• (C) Keesom interaction
• ✅ (D) Hydrogen bonding
Correct Answer: (D) Hydrogen bonding
Rationale: Hydrogen bonding is the strongest intermolecular force among the options provided.
It occurs when hydrogen is bonded to highly electronegative elements like oxygen, nitrogen, or
fluorine, creating a strong dipole.
Quick Tip: Hydrogen bonds are stronger than dipole-dipole interactions and London dispersion
forces, but weaker than covalent bonds.
Question 4:
What is the oxidation state of the chlorine atom in the compound HCl?
• (A) +1
• ✅ (B) −1
• (C) +2
• (D) −2
Correct Answer: (B) −1
Rationale: In HCl, hydrogen has an oxidation state of +1, and since the compound is neutral
overall, chlorine must have an oxidation state of −1 to balance the +1 charge of hydrogen.
Quick Tip: In most compounds, chlorine typically has an oxidation state of −1.
Question 5:
What is the correct name of AgNO3?
• (A) Argent nitrous
• (B) Argent oxide
• (C) Silver nitrite
• ✅ (D) Silver nitrate
Correct Answer: (D) Silver nitrate
Rationale: AgNO3 is silver nitrate, where "argent" refers to silver (Ag) and "nitrate" refers to
the NO3 ion.
COMPREHENSIVE STUDY GUIDE
Latest Update
Prepare to ace the HESI A2 Chemistry exam with our expertly designed online quiz featuring
25 practice questions and detailed answers!!!
Question 1:
What is the correct formula for silver hydroxide?
• (A) AgO2
• ✅ (B) AgOH
• (C) AgOH2
• (D) AgH2O
Correct Answer: (B) AgOH
Rationale: Silver hydroxide consists of one silver (Ag) atom bonded to one hydroxide (OH)
group. The correct formula is AgOH.
Quick Tip: When naming or writing formulas for hydroxides, the metal is followed by OH
(hydroxide).
Question 2:
A salt solution has a molarity of 1.5 M. How many moles of this salt are present in 2.0 L of
this solution?
• (A) 0.75
• (B) 1.5
• (C) 2.0
• ✅ (D) 3.0
Correct Answer: (D) 3.0
Rationale: Molarity (M) is defined as moles of solute per liter of solution. To find the moles of
salt, multiply the molarity by the volume of the solution:
1.5 M × 2.0 L = 3.0 moles.
Quick Tip: Molarity (M) = moles of solute / liters of solution. Multiply M × L to find the moles
of solute.
, Question 3:
Which of these types of intermolecular force is strongest?
• (A) Dipole-dipole interaction
• (B) London dispersion force
• (C) Keesom interaction
• ✅ (D) Hydrogen bonding
Correct Answer: (D) Hydrogen bonding
Rationale: Hydrogen bonding is the strongest intermolecular force among the options provided.
It occurs when hydrogen is bonded to highly electronegative elements like oxygen, nitrogen, or
fluorine, creating a strong dipole.
Quick Tip: Hydrogen bonds are stronger than dipole-dipole interactions and London dispersion
forces, but weaker than covalent bonds.
Question 4:
What is the oxidation state of the chlorine atom in the compound HCl?
• (A) +1
• ✅ (B) −1
• (C) +2
• (D) −2
Correct Answer: (B) −1
Rationale: In HCl, hydrogen has an oxidation state of +1, and since the compound is neutral
overall, chlorine must have an oxidation state of −1 to balance the +1 charge of hydrogen.
Quick Tip: In most compounds, chlorine typically has an oxidation state of −1.
Question 5:
What is the correct name of AgNO3?
• (A) Argent nitrous
• (B) Argent oxide
• (C) Silver nitrite
• ✅ (D) Silver nitrate
Correct Answer: (D) Silver nitrate
Rationale: AgNO3 is silver nitrate, where "argent" refers to silver (Ag) and "nitrate" refers to
the NO3 ion.
