HESI A2 Chemistry Study Guide
From atoms and the periodic table to bonding, reactions, solutions and the biochemistry your body runs on.
30 questions · 25minutes on the real exam · 5 units · 12 lessons · updated July 2026
Matter and Measurement
~28% of the sectionHandle scientific notation, the metric system, temperature scales and atomic structure.
Bonding and Reactions
~24% of the sectionLockedSee how atoms bond, how reactions are written and balanced, and what changes their rate.
Quantitative Chemistry
~24% of the sectionLockedMeasure concentration, work through stoichiometry, and track oxidation and reduction.
Aqueous and Nuclear Chemistry
~16% of the sectionLockedCover acids and bases on the pH scale, and the basics of nuclear decay.
Biochemistry
~8% of the sectionLockedMeet the four biological macromolecules your body is built from.
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