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HESI A2: Chemistry Questions and
Answers | Latest Version | 2025/2026 | Correct & Verified
What is the substance that gains electrons in a redox reaction called?✔✔Oxidizing agent
What is the part of an experiment that does not change and is used for comparison?✔✔Control
What is the sum of the atomic masses of all atoms in a molecule?✔✔Molecular mass
What is the energy needed to start a chemical reaction called?✔✔Activation energy
What is the type of reaction that occurs when oxygen combines with another substance, releasing heat and light?✔✔Combustion reaction 1 / 2
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What type of chemical bond involves equal sharing of electrons?✔✔Nonpolar covalent bond
What type of chemical bond involves unequal sharing of electrons?✔✔Polar covalent bond
What is the SI unit of pressure?✔✔Pascal
What is the instrument used to measure atmospheric pressure?✔✔Barometer
What is the name for the repeating pattern of a crystalline solid?✔✔Crystal lattice
What is the name for the positively charged center of an atom?✔✔Nucleus
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