Name: 
 

Chapter 2 Review



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?
a.
nitrogen
b.
calcium
c.
iodine
d.
sodium
e.
phosphorus
 

 2. 

Which of the following statements is false?
a.
Atoms of the various elements differ in their number of subatomic particles.
b.
All atoms of a particular element have the same number of protons in their nuclei.
c.
The neutrons and protons present in the nucleus of an atom are almost identical in mass; each has a mass of about 1 dalton.
d.
An atom is the smallest unit of an element that still retains the properties of the element.
e.
Protons and electrons are electrically charged particles. Protons have one unit of negative charge, and electrons have one unit of positive charge.
 

 3. 

What is the approximate atomic mass of an atom with 16 neutrons, 15 protons, and 15 electrons?
a.
15 daltons
b.
16 daltons
c.
30 daltons
d.
31 daltons
e.
46 daltons
 

 4. 

Different atomic forms of an element contain the same number of protons but a different number of neutrons. What are these different atomic forms called?
a.
ions
b.
isotopes
c.
neutronic atoms
d.
isomers
e.
radioactive atoms
 

 5. 

One difference between carbon-12 chpt2_files/i0060000.jpg and carbon-14 chpt2_files/i0060001.jpg is that carbon-14 has
a.
two more protons than carbon-12.
b.
two more electrons than carbon-12.
c.
two more neutrons than carbon-12.
d.
A and C only
e.
B and C only
 

 6. 

Electrons exist only at fixed levels of potential energy. However, if an atom absorbs sufficient energy, a possible result is that
a.
an electron may move to an electron shell farther out from the nucleus.
b.
an electron may move to an electron shell closer to the nucleus.
c.
the atom may become a radioactive isotope.
d.
the atom would become a positively charged ion, or cation.
e.
the atom would become a negatively charged ion, or anion.
 
 
Use the figure below to answer the following questions.

chpt2_files/i0080000.jpg
 

 7. 

Which drawing depicts the electron configuration of neon (chpt2_files/i0090000.jpgNe)?
a.
Drawing A
b.
Drawing B
c.
Drawing C
d.
Drawing D
e.
Drawing E
 

 8. 

Which drawing depicts the electron configuration of oxygen (chpt2_files/i0100000.jpgO)?
a.
Drawing A
b.
Drawing B
c.
Drawing C
d.
Drawing D
e.
Drawing E
 

 9. 

What are the chemical properties of atoms whose valence shells are filled with electrons?
a.
They form ionic bonds in aqueous solutions.
b.
They form covalent bonds in aqueous solutions.
c.
They are stable and chemically unreactive or inert.
d.
They exhibit similar chemical behaviors.
e.
C and D only
 
 
Use the information extracted from the periodic table in the figure below to answer the following questions.

chpt2_files/i0120000.jpg
 

 10. 

How many electrons does phosphorus have in its valence shell?
a.
1
b.
2
c.
3
d.
4
e.
5
 

 11. 

Based on electron configuration, which of these elements would exhibit chemical behavior most like that of oxygen?
a.
carbon
b.
hydrogen
c.
nitrogen
d.
sulfur
e.
phosphorus
 

 12. 

What do atoms form when they share electron pairs?
a.
elements
b.
ions
c.
aggregates
d.
isotopes
e.
molecules
 

 13. 

What is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?
a.
1
b.
2
c.
3
d.
4
e.
6
 

 14. 

When two atoms are equally electronegative, they will interact to form
a.
equal numbers of isotopes.
b.
ions.
c.
polar covalent bonds.
d.
nonpolar covalent bonds.
e.
ionic attractions.
 

 15. 

What results from an unequal sharing of electrons between atoms?
a.
a nonpolar covalent bond
b.
a polar covalent bond
c.
an ionic attraction
d.
a hydrogen bond
e.
a hydrophobic interaction
 

 16. 

The ionic attraction of sodium chloride is formed when
a.
chlorine gains an electron from sodium.
b.
sodium and chlorine share an electron pair.
c.
sodium and chlorine both lose electrons from their outer valence shells.
d.
sodium gains an electron from chlorine.
e.
chlorine gains a proton from sodium.
 

 17. 

What is the difference between covalent bonds and ionic attractions?
a.
Covalent bonds involve the sharing of protons between atoms, and ionic attractions involve the sharing of electrons between atoms.
b.
Covalent bonds involve the sharing of neutrons between atoms, and ionic attractions involve the sharing of electrons between atoms.
c.
Covalent bonds involve the sharing of electrons between atoms, and ionic attractions involve the electrical attraction between atoms.
d.
Covalent bonds involve the sharing of protons between atoms, and ionic attractions involve the sharing of neutrons between atoms.
e.
Covalent bonds involve the transfer of electrons between atoms, and ionic attractions involve the sharing of neutrons between atoms.
 

 18. 

What kind of a bond does NH4+ form with Cl- to make ammonium chloride salt (NH4Cl)?
a.
nonpolar covalent
b.
polar covalent
c.
ionic
d.
hydrogen
e.
C and D only
 

 19. 

Which of the following is not considered to be a weak molecular interaction?
a.
a covalent bond
b.
a van der Waals (aka London Dispersion) interaction
c.
an ionic attraction in the presence of water
d.
a hydrogen bond
e.
A and B only
 

 20. 

Which of the following is true for this reaction? 3H2 + N2 chpt2_files/i0230000.jpg 2NH3
a.
The reaction is nonreversible.
b.
Hydrogen and nitrogen are the reactants of the reverse reaction.
c.
Hydrogen and nitrogen are the products of the forward reaction.
d.
Ammonia is being formed and decomposed.
e.
Hydrogen and nitrogen are being decomposed.
 



 
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