HESI A2 practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q21Which of these is a water-soluble vitamin?
✓ Correct answer: D. vitamin C
B and C vitamins are soluble, meaning they are not stored by the body and must be replaced each day.
Q22Which of the following elements are closest in atomic size?
✓ Correct answer: C. La and Hf
Atomic radius increases down the periodic table and decreases from left to right across the periodic table. With increasing quantum number, however, this trend is not as apparent. This phenomenon, known as the lanthanide contraction, results in elements La and Hf being practically the same size.
Q23A particle with a negative or positive charge is referred to as <code>________</code>.
✓ Correct answer: A. an ion
Ions have a different number of electrons and protons, which makes them have either a positive or negative charge.
Q24What form(s) the skeletons of most organic molecules?
✓ Correct answer: D. Carbon chains.
Carbon chains form the skeletons of most organic molecules. It is the variation in carbon skeletons that contributes to the diversity of most organic molecules.
Q25What is the heat released per minute when a voltage of 10 V is applied across a resistor of 10Ω?
✓ Correct answer: C. 600 J
The power dissipated by a resistor is VI = I<sup>2</sup>R = V<sup>2</sup>/R. In this case, power = (10 Volts)<sup>2</sup>/10 Ohm = 10 Watts = 10 Joule/second. To get the heat dissipated per minute, multiply 10 Joule/second x 60 seconds/minute = 600 Joules or 0.6 KJ.
Q26A subatomic particle is <code>________</code> in relation to an atom.
✓ Correct answer: B. smaller
Subatomic particles (which include neutrons, protons, and electrons) are much smaller than atoms.
Q27<code>________</code> confident that with enough study they can easily pass the final exam.
✓ Correct answer: C. They’re
The contraction “They’re” has the same meaning as “They are” and is the correct phrase to complete the sentence.
Q28The United States has <code>________</code> states than Europe has countries; there are only 47 European countries, but there are 50 states in America.
✓ Correct answer: C. more
Based on the context of the second clause, we know that there must be MORE states than European countries. When comparing two items, we use the comparative word, “more.” If we were comparing three or more items, we’d use the superlative form “most.”
Q29Which of the following words is most similar in meaning to "Magnetic"?
✓ Correct answer: C. Captivating
Magnetic is often used to describe something that attracts or holds attention, just like a magnet. Similarly, captivating means holding attention or interest in an irresistible or enchanting way. Both words convey the idea of something that is attractive and draws you in. Therefore, captivating is the word that is most similar in meaning to magnetic.
Q30The more medically specific term for the neck region of the spine is the
✓ Correct answer: B. cervical.
Cervical means "of or relating to the neck." The cervical region consists of seven bones that are separated from one another by intervertebral discs. The thoracic region (choice A) is the part of the vertebrate body between the neck and the abdomen. Thoracic vertebrae have limited movement, provide support to the rib cage, and protect the lungs and heart. The lumbar region (choice C) consists of vertebrae in the lower back that support the weight of the body. The sacral region (choice D) connects the vertebral column to the hip bones and form the pelvic girdle.
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Theory