HESI Chemistry Practice Questions — Free Sampler (2026)

PreNursePrep has 99 Chemistry questions for the HESI A2, each written to the current blueprint and each with a rationale explaining why the right answer is right. The free sampler gives you 40 of them, timed and scored like the real exam, with no card and no sign-up.

  • 99 Chemistry questions in the bank
  • 30 on the real exam · 25 minutes
  • Rationale on every question
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3 sample Chemistry questions

Drawn from the live HESI A2 bank. Answers and rationales open in the practice player.

  1. Question 1Atomic structure and periodic table

    An atom of carbon-12 contains 6 protons and 6 neutrons. How many electrons does a neutral carbon-12 atom have?

    • A6
    • B12
    • C18
    • D3
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  2. Question 2Chemical bonds and reactions, balancing equations

    In the reaction 2 H₂ + O₂ → 2 H₂O, which statement correctly describes what is conserved?

    • AThe number of molecules is conserved but the number of atoms is not.
    • BBoth the number of atoms and the number of molecules are conserved.
    • CThe number of atoms is conserved but the number of molecules is not.
    • DNeither atoms nor molecules are conserved because energy is released.
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  3. Question 3States of matter, phase changes, properties

    A puddle of water left outdoors on a dry, sunny day disappears without reaching its boiling point. Which phase change best explains this observation?

    • ACondensation
    • BSublimation
    • CEvaporation
    • DMelting
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