HESI A2 Chemistry LATEST 2025/2026
EXAM QUESTIONS WITH CORRECT
ANSWERS
What makes an atom's physical structure? - ANSWER A nucleus and orbits(sometimes known as electron clouds) What composes the center of the atom? - ANSWER Protons and neutrons What spins in the orbits of an atom? - ANSWER Electrons What are the energy levels of the atom called? - ANSWER Shells or orbits What is the term used to define an atom that is electrically charged? - ANSWER Ionic state.What is a cation? - ANSWER An atom with a positive charge 1 / 3
What is anion? - ANSWER An atom with a negative charge What is the structure of the periodic table? - ANSWER A series of rows called periods, and columns called groups.What can be predicted by the group an element occupies? - ANSWER Charge and the numbers of electrons in its outer shell.What is the name and properties of group VIII of the periodic table? - ANSWER Noble gases.They tend to remain neutral in most situations, because their outer orbits are complete.What is the atomic number? - ANSWER The number of protons in the nucleus, defines an atom of a particular element.What is the atomic mass? - ANSWER The average mass of an element's isotopes. 2 / 3
What are isotopes? - ANSWER Different kinds of the same atom that vary in weight.What is a compound? - ANSWER The combination of different elements.What do chemical reactions resemble? - ANSWER A cooking recipe.What are the reactants in a chemical reaction? - ANSWER The ingredients of a chemical reaction.What is the term given to the results of a chemical reaction? - ANSWER The products.Why must a chemical equation be balanced at the end of a reaction? - ANSWER Because the law of conservation of mass indicates that mass cannot be created nor destroyed in a chemical reaction.What are equilibrium reactions? - ANSWER Chemical reactions that stop before all the reactants are used to make the products.
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