HESI A2 CHEMISTRY FINAL PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
WITH EXPLANATION PRACTICE SOLUTION
STUDY GUIDE GRADED A+
⩥ 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
⩥ 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.
⩥ 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.
⩥ What causes equilibrium? Answer: The state in which reactants are
forming products at the same rate that products are forming reactants.
⩥ What are the four basic ways to increase the reaction rate? Answer:
Increase temperature
Increase the surface area of the reactants
Add a catalyst
Increase the concentration of the reactants.
⩥ What does increasing temperature cause in a chemical reaction?
Answer: The particles have greater kinetic energy, increasing the speed
at which they move around, and the chance of collision between
particles.
COMPLETE QUESTIONS AND ANSWERS
WITH EXPLANATION PRACTICE SOLUTION
STUDY GUIDE GRADED A+
⩥ 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
⩥ 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.
⩥ 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.
⩥ What causes equilibrium? Answer: The state in which reactants are
forming products at the same rate that products are forming reactants.
⩥ What are the four basic ways to increase the reaction rate? Answer:
Increase temperature
Increase the surface area of the reactants
Add a catalyst
Increase the concentration of the reactants.
⩥ What does increasing temperature cause in a chemical reaction?
Answer: The particles have greater kinetic energy, increasing the speed
at which they move around, and the chance of collision between
particles.
