HESI A2 Chem istr y Exam Questions w ith 100%
Ver ifi ed Cor r ect Answ er s
1. What makes an atom's physical structure?
Correct A nucleus and orbits(sometimes known as electron clouds)
2. What composes the center of the atom?
Correct Protons and neutrons
3. What spins in the orbits of an atom?
Correct Electrons
4. What are the energy levels of the atom called?
Correct Shells or orbits
5. What is the term used to define an atom that is electrically charged?
Correct Ionic state.
6. What is a cation?
Correct An atom with a positive charge
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,7. What is anion?
Correct An atom with a negative charge
8. What is the structure of the periodic table?
Correct A series of rows called periods, and columns called groups.
9. What can be predicted by the group an element occupies?
Correct Charge and the numbers of electrons in its outer shell.
10. What is the name and properties of group VIII of the periodic table?
Correct Noble gases.
They tend to remain neutral in most situations, because their outer orbits are complete.
11. What is the atomic number?
Correct The number of protons in the nucleus, defines an atom of a particular element.
12. What is the atomic mass?
Correct The average mass of an element's isotopes.
13. What are isotopes?
Correct Ditterent kinds of the same atom that vary in weight.
14. What is a compound?
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, Correct The combination of different elements.
15. What do chemical reactions resemble?
Correct A cooking recipe.
16. What are the reactants in a chemical reaction?
Correct The ingredients of a chemical reaction.
17. What is the term given to the results of a chemical reaction?
Correct The products.
18. Why must a chemical equation be balanced at the end of a reaction?
Correct Because the law of conservation of mass indicates that mass cannot be created nor destroyed in a
chemical reaction.
19. What are equilibrium reactions?
Correct Chemical reactions that stop before all the reactants are used to make the products.
20. What causes equilibrium?
Correct The state in which reactants are forming products at the same rate that products are forming
reactants.
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Ver ifi ed Cor r ect Answ er s
1. What makes an atom's physical structure?
Correct A nucleus and orbits(sometimes known as electron clouds)
2. What composes the center of the atom?
Correct Protons and neutrons
3. What spins in the orbits of an atom?
Correct Electrons
4. What are the energy levels of the atom called?
Correct Shells or orbits
5. What is the term used to define an atom that is electrically charged?
Correct Ionic state.
6. What is a cation?
Correct An atom with a positive charge
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17
,7. What is anion?
Correct An atom with a negative charge
8. What is the structure of the periodic table?
Correct A series of rows called periods, and columns called groups.
9. What can be predicted by the group an element occupies?
Correct Charge and the numbers of electrons in its outer shell.
10. What is the name and properties of group VIII of the periodic table?
Correct Noble gases.
They tend to remain neutral in most situations, because their outer orbits are complete.
11. What is the atomic number?
Correct The number of protons in the nucleus, defines an atom of a particular element.
12. What is the atomic mass?
Correct The average mass of an element's isotopes.
13. What are isotopes?
Correct Ditterent kinds of the same atom that vary in weight.
14. What is a compound?
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, Correct The combination of different elements.
15. What do chemical reactions resemble?
Correct A cooking recipe.
16. What are the reactants in a chemical reaction?
Correct The ingredients of a chemical reaction.
17. What is the term given to the results of a chemical reaction?
Correct The products.
18. Why must a chemical equation be balanced at the end of a reaction?
Correct Because the law of conservation of mass indicates that mass cannot be created nor destroyed in a
chemical reaction.
19. What are equilibrium reactions?
Correct Chemical reactions that stop before all the reactants are used to make the products.
20. What causes equilibrium?
Correct The state in which reactants are forming products at the same rate that products are forming
reactants.
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