HESI A2 Chemistry Exam | Questions, Answers & Study Guide | 2026/2027

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HESI A2 Chemistry
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1. What makes an A nucleus and orbits(sometimes known as electron clouds)
atom's physical
structure?

2. What composes Protons and neutrons
the center of the
atom?

3. What spins in Electrons
the orbits of an
atom?

4. What are the en- Shells or orbits
ergy levels of the
atom called?

5. What is the term Ionic state.
used to define an
atom that is elec-
trically charged?

6. What is a cation? An atom with a positive charge

7. What is anion? An atom with a negative charge

8. What is the struc- A series of rows called periods, and columns called groups.
ture of the peri-
odic table?



9. What can be pre- Charge and the numbers of electrons in its outer shell.
dicted by the


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group an ele-
ment occupies?

10. What is the name Noble gases.
and properties of They tend to remain neutral in most situations, because their outer orbits are
group VIII of the complete.
periodic table?

11. What is the atom- The number of protons in the nucleus, defines an atom of a particular element.
ic number?

12. What is the atom- The average mass of an element's isotopes.
ic mass?

13. What are iso- Different kinds of the same atom that vary in weight.
topes?

14. What is a com- The combination of different elements.
pound?

15. What do chemi- A cooking recipe.
cal reactions re-
semble?

16. What are the The ingredients of a chemical reaction.
reactants in a
chemical reac-
tion?

17. What is the term The products.
given to the re-
sults of a chemi-
cal reaction?


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18. Why must a Because the law of conservation of mass indicates that mass cannot be created
chemical equa- nor destroyed in a chemical reaction.
tion be balanced
at the end of a re-
action?

19. What are equilib- Chemical reactions that stop before all the reactants are used to make the prod-
rium reactions? ucts.

20. What causes The state in which reactants are forming products at the same rate that products
equilibrium? are forming reactants.

21. What are the four Increase temperature
basic ways to in- Increase the surface area of the reactants
crease the reac- Add a catalyst
tion rate? Increase the concentration of the reactants.

22. What does in- The particles have greater kinetic energy, increasing the speed at which they move
creasing temper- around, and the chance of collision between particles.
ature cause in
a chemical reac-
tion?

23. How does in- Gives the Particles more opportunities to come in contact with each other.
creasing the sur-
face area of the
particles in a
reaction speed
chemical reac-
tions?

24. What is a cata- An agent that accelerates a chemical reaction by reducing the activation energy
lyst? or the amount of energy necessary for a reaction to occur.

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