HESI A2 CHEMISTRY ACTUAL EXAM
2026/2027
25 Questions | Complete Exam-Style Questions with Detailed Rationales
100% Verified | Graded A+
HESI A2 Chemistry Examination – Comprehensive Foundational Chemistry Competency Assessment
for Nursing Program Admission
Elsevier Evolve / ATI Testing Standards
Core Domains: Atomic Structure & Periodic Trends (4 MCQ), Chemical Bonding & Molecular
Geometry (4 MCQ), Chemical Reactions & Stoichiometry (5 MCQ), Acids, Bases & pH (5 MCQ),
Solutions & Concentration (4 MCQ), Nuclear Chemistry & Organic Fundamentals (3 MCQ)
HESI A2 Chemistry–Aligned Format
• Exact official question count: 25 multiple-choice questions (MCQ)
• All questions in MCQ format with four options (A, B, C, D), single-best-answer unless SATA
• Total testing time: Approximately 25 minutes (computer-based, proctored format)
• Passing score: Program-dependent; typically 75–80% composite or 70% minimum per
section
, Examination Overview
Domain Questions Key Topics Weight
Atomic Structure & 4 Protons/Neutrons/Electrons, 16%
Periodic Trends Isotopes, Electron
Configuration, Periodic
Trends
(Electronegativity/Ionization
Energy/Atomic Radius)
Chemical Bonding & 4 Ionic/Covalent/Metallic 16%
Molecular Geometry Bonds, Lewis Structures,
VSEPR Theory, Polarity,
Intermolecular Forces
Chemical Reactions & 5 Balancing Equations, 20%
Stoichiometry Reaction Types, Mole
Conversions, Limiting
Reactants, Percent Yield, Gas
Laws
Acids, Bases & pH 5 pH/pOH Calculations, 20%
Strong vs. Weak
Acids/Bases, Buffer Systems,
Neutralization Reactions,
Biological pH Homeostasis
Solutions & 4 Molarity/Molality, Dilution 16%
Concentration Calculations, Solubility
Rules, Colligative Properties,
Solution Preparation
Nuclear Chemistry & 3 Radioactive Decay, Half-Life, 12%
Organic Organic Functional Groups,
Fundamentals Hydrocarbon Classification,
Basic Biochemistry
Connections
Introduction
This HESI A2 Chemistry Actual Exam format for 2026/2027 reflects the standardized competency
assessment used to evaluate foundational chemistry knowledge for pre-licensure nursing program
admission candidates. The official examination consists of exactly 25 multiple-choice questions (MCQ)
covering critical domains: atomic structure and periodic trends, chemical bonding and molecular
geometry, chemical reactions and stoichiometry, acids/bases and pH, solutions and concentration,
nuclear chemistry basics, organic chemistry fundamentals, and scenario-based application. The exam
measures essential scientific knowledge required for success in rigorous nursing curricula, aligned
with current Elsevier HESI test blueprints, nursing program admission standards, and undergraduate
chemistry competency frameworks.
Answer Format: All correct answers are presented in bold, each question appears in bold, and all
rationales explaining chemical principles, calculation methodologies, reaction mechanisms, and
scenario-based reasoning are written in italic font.
2026/2027
25 Questions | Complete Exam-Style Questions with Detailed Rationales
100% Verified | Graded A+
HESI A2 Chemistry Examination – Comprehensive Foundational Chemistry Competency Assessment
for Nursing Program Admission
Elsevier Evolve / ATI Testing Standards
Core Domains: Atomic Structure & Periodic Trends (4 MCQ), Chemical Bonding & Molecular
Geometry (4 MCQ), Chemical Reactions & Stoichiometry (5 MCQ), Acids, Bases & pH (5 MCQ),
Solutions & Concentration (4 MCQ), Nuclear Chemistry & Organic Fundamentals (3 MCQ)
HESI A2 Chemistry–Aligned Format
• Exact official question count: 25 multiple-choice questions (MCQ)
• All questions in MCQ format with four options (A, B, C, D), single-best-answer unless SATA
• Total testing time: Approximately 25 minutes (computer-based, proctored format)
• Passing score: Program-dependent; typically 75–80% composite or 70% minimum per
section
, Examination Overview
Domain Questions Key Topics Weight
Atomic Structure & 4 Protons/Neutrons/Electrons, 16%
Periodic Trends Isotopes, Electron
Configuration, Periodic
Trends
(Electronegativity/Ionization
Energy/Atomic Radius)
Chemical Bonding & 4 Ionic/Covalent/Metallic 16%
Molecular Geometry Bonds, Lewis Structures,
VSEPR Theory, Polarity,
Intermolecular Forces
Chemical Reactions & 5 Balancing Equations, 20%
Stoichiometry Reaction Types, Mole
Conversions, Limiting
Reactants, Percent Yield, Gas
Laws
Acids, Bases & pH 5 pH/pOH Calculations, 20%
Strong vs. Weak
Acids/Bases, Buffer Systems,
Neutralization Reactions,
Biological pH Homeostasis
Solutions & 4 Molarity/Molality, Dilution 16%
Concentration Calculations, Solubility
Rules, Colligative Properties,
Solution Preparation
Nuclear Chemistry & 3 Radioactive Decay, Half-Life, 12%
Organic Organic Functional Groups,
Fundamentals Hydrocarbon Classification,
Basic Biochemistry
Connections
Introduction
This HESI A2 Chemistry Actual Exam format for 2026/2027 reflects the standardized competency
assessment used to evaluate foundational chemistry knowledge for pre-licensure nursing program
admission candidates. The official examination consists of exactly 25 multiple-choice questions (MCQ)
covering critical domains: atomic structure and periodic trends, chemical bonding and molecular
geometry, chemical reactions and stoichiometry, acids/bases and pH, solutions and concentration,
nuclear chemistry basics, organic chemistry fundamentals, and scenario-based application. The exam
measures essential scientific knowledge required for success in rigorous nursing curricula, aligned
with current Elsevier HESI test blueprints, nursing program admission standards, and undergraduate
chemistry competency frameworks.
Answer Format: All correct answers are presented in bold, each question appears in bold, and all
rationales explaining chemical principles, calculation methodologies, reaction mechanisms, and
scenario-based reasoning are written in italic font.
