HESI A2 Chemistry Study
Guide 2026 | Practice
Questions, Answers &
Science Review
|Graded A+ | Guaranteed
success|
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, What spins in the orbits of an atom? Electrons
What are the energy levels of the atom called? Shells or orbits
What is the term used to define an atom that is Ionic state.
electrically charged?
What is a cation? An atom with a positive charge
What is anion? An atom with a negative charge
What is the structure of the periodic table? A series of rows called periods, and columns called groups.
What can be predicted by the group an element Charge and the numbers of electrons in its outer shell.
occupies?
What is the name and properties of group VIII of the Noble gases.
periodic table? They tend to remain neutral in most situations, because their outer orbits are
complete.
What is the atomic number? The number of protons in the nucleus, defines an atom of a particular element.
What is the atomic mass? The average mass of an element's isotopes.
What are isotopes? Different kinds of the same atom that vary in weight.
What is a compound? The combination of different elements.
What do chemical reactions resemble? A cooking recipe.
What are the reactants in a chemical reaction? The ingredients of a chemical reaction.
What is the term given to the results of a chemical The products.
reaction?
Why must a chemical equation be balanced at the end of Because the law of conservation of mass indicates that mass cannot be created
a reaction? nor destroyed in a chemical reaction.
What are equilibrium reactions? Chemical reactions that stop before all the reactants are used to make the
products.
What causes equilibrium? The state in which reactants are forming products at the same rate that products
are forming reactants.
Guide 2026 | Practice
Questions, Answers &
Science Review
|Graded A+ | Guaranteed
success|
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included
, What spins in the orbits of an atom? Electrons
What are the energy levels of the atom called? Shells or orbits
What is the term used to define an atom that is Ionic state.
electrically charged?
What is a cation? An atom with a positive charge
What is anion? An atom with a negative charge
What is the structure of the periodic table? A series of rows called periods, and columns called groups.
What can be predicted by the group an element Charge and the numbers of electrons in its outer shell.
occupies?
What is the name and properties of group VIII of the Noble gases.
periodic table? They tend to remain neutral in most situations, because their outer orbits are
complete.
What is the atomic number? The number of protons in the nucleus, defines an atom of a particular element.
What is the atomic mass? The average mass of an element's isotopes.
What are isotopes? Different kinds of the same atom that vary in weight.
What is a compound? The combination of different elements.
What do chemical reactions resemble? A cooking recipe.
What are the reactants in a chemical reaction? The ingredients of a chemical reaction.
What is the term given to the results of a chemical The products.
reaction?
Why must a chemical equation be balanced at the end of Because the law of conservation of mass indicates that mass cannot be created
a reaction? nor destroyed in a chemical reaction.
What are equilibrium reactions? Chemical reactions that stop before all the reactants are used to make the
products.
What causes equilibrium? The state in which reactants are forming products at the same rate that products
are forming reactants.
