Hesi Chemistry Basis Exam Newest 2026 Questions and Correct Detailed Answers and Rationales Already Graded A+

Hesi Chemistry Basis Exam Newest 2026 Questions and
Correct Detailed Answers and Rationales Already
Graded A+



KEY CONCEPTS TO REMEMBER

 pH scale: 0–14
 Acid: pH < 7
 Base: pH > 7
 Neutral: pH = 7
 Water (H₂O) = universal solvent
 Electrolytes = conduct electricity in solution



SECTION A: ATOMIC STRUCTURE



1.

Which particle has a positive charge?

A. Electron
B. Proton
C. Neutron
D. Ion

Answer: B (Proton)

Rationale:
Protons carry a positive charge; electrons are negative, neutrons are neutral.



2.

, The atomic number represents:

A. Neutrons
B. Protons
C. Electrons + neutrons
D. Mass

Answer: B

Rationale:
Atomic number = number of protons.



3.

Which particle determines chemical reactivity?

A. Neutron
B. Proton
C. Electron
D. Nucleus

Answer: C

Rationale:
Electrons (especially valence electrons) determine bonding and reactivity.



SECTION B: CHEMICAL BONDS



4.

Sharing of electrons forms a:

A. Ionic bond
B. Covalent bond
C. Hydrogen bond
D. Metallic bond