Chem 051 - Fundamentals of Chemistry » Winter 2021 » Homework Week 2
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Question #1
The octet rule indicates that
A.
atoms lose, gain, or share valence electrons to have 8 valence electrons.
B.
all of the Group A elements have 8 valence electrons.
C.
all of the shells in an atom hold a maximum of 8 electrons.
D.
ll of the noble gases have eight total electrons.
E.
the noble gases react with other compounds to get 8 valence electrons.
Question #2
The ion of aluminum is
A.
Al3-.
B.
Al+.
C.
Al2-.
D.
Al2+.
E.
Al3+.
Question #3
An ionic compound
A.
has a net negative charge.
B.
contains only anions.
C.
contains only cations.
D.
has a net positive charge.
E.
has a net charge of zero.
Question #4
The correct formula for a compound formed from the elements Al and O is
A.
AlO3.
B.
AlO.
C.
Al2O3.
D.
Al3O2.
E.
Al2O.
Question #5
Which one of the following compounds contains an ion with a 3+ charge?
A.
FeCl3
B.
Na2O
C.
MgCl2
D.
CuCl
E.
KCl
Question #6
The compound MgCl2 is named
A.
magnesium dichloride.
B.
magnesium (II) chloride.
C.
magnesium chloride.
D.
magnesium chlorine.
E.
dimagnesium chloride.
Question #7
Which one of the following elements forms two or more ions with different ionic charges?
A.
Fe
B.
K
C.
Ca
D.
F
E.
O
Question #8
What is the correct formula for the iron (II) ion?
A.
Fe2+
B.
Fe+
C.
Fe3-
D.
Fe3+
E.
Fe2-
Question #9
In ionic compounds, ________ lose their valence electrons to form positively charged ________.
A.
metals, cations
B.
metals, anions
C.
metals, polyatomic ions
D.
nonmetals, cations
E.
nonmetals, anions
Question #10
What is the correct formula for iron (III) sulfide?
A.
FeS2
B.
Fe2S3
C.
Fe2S2
D.
FeS
E.
Fe2S
Question #11
A(n) ________ is the smallest neutral unit of two or more atoms held together by a covalent bond.
A.
nucleus
B.
unit
C.
molecule
D.
formula
E.
ionic compound
Question #12
In a molecule with covalent bonding,
A.
atoms of different metals form bonds.
B.
atoms are held together by sharing electrons.
C.
atoms of metals form bonds to atoms of nonmetals.
D.
oppositely charged ions are held together by strong electrical attractions.
E.
atoms of noble gases are held together by attractions between oppositely charged ions.
Question #13
Which of the following elements does not exist as a diatomic molecule?
A.
chlorine
B.
nitrogen
C.
carbon
D.
hydrogen
E.
oxygen
Question #14
In a covalently bonded molecule, the number of electrons that an atom shares with others is usually equal to the number of electrons
A.
in its nucleus.
B.
in the atom.
C.
in its ion.
D.
needed to give it a noble gas arrangement.
E.
in all the atoms.
Question #15
Double and triple bonds form because
A.
one of the atoms in the molecule has more than 8 valence electrons.
B.
there is at least one hydrogen atom involved in the bond.
C.
the atoms involved have high electronegativities.
D.
the ions involved have charges larger than one.
E.
single covalent bonds do not give all of the atoms in the molecule eight valence electrons.
Question #16
The correct name of the compound NCl3 is
A.
nitrogen chloride.
B.
nitrogen trichloride.
C.
nitrogen(III) chloride.
D.
nickel chloride.
E.
trinitrogen chloride
Question #17
According to naming rules, the types of compound that use prefixes in their names are
A.
compounds that contain polyatomic ions.
B.
covalent compounds.
C.
ionic compounds.
D.
ionic compounds involving transition metals.
E.
polyatomic ions.
Question #18
How many electrons will aluminum gain or lose when it forms an ion?
A.
gain 5
B.
gain 1
C.
lose 2
D.
lose 3
E.
lose 1
Question #19
What is the formula of carbon tetraiodide?
A.
CI3
B.
C4I
C.
CI4
D.
CI
E.
C2I4
Question #20
The name of Al2(SO4)3 is
A.
aluminum(III) sulfate.
B.
dialuminum trisulfate.
C.
dialuminum trisulfide.
D.
dialuminum sulfate.
E.
aluminum sulfate.
Question #21
The ability of an atom to attract the shared electrons in a covalent bond is its
A.
electronegativity.
B.
nonpolarity.
C.
polarity.
D.
ionic character.
E.
bonding ability.
Question #22
Which of the following compounds contains a polar covalent bond?
A.
HCl
B.
Br2
C.
MgO
D.
O2
E.
NaF
Question #23
Ionic bonding is expected in which of these compounds?
A.
Cl2
B.
KF
C.
OF2
D.
HF
E.
H2
Question #24
A polar covalent bond is found in which of these compounds?
A.
H2O
B.
NaCl
C.
H2
D.
N2
E.
F2
Question #25
A group of covalently bonded atoms that has an overall electrical charge is called a(n)
A.
ionic compound.
B.
polyatomic ion.
C.
molecule.
D.
cation.
E.
anion.
Question #26
What is the symbol for the ion with 19 protons and 18 electrons?
A.
F+
B.
F-
C.
Ar+
D.
K+
E.
K-
Question #27
Which of the following polyatomic ions has a positive charge?
A.
hydrogen carbonate
B.
ammonium
C.
hydroxide
D.
cyanide
E.
nitrate
Question #28
Which of the following polyatomic ions has a 3- ionic charge?
A.
hydroxide
B.
phosphate
C.
nitrate
D.
sulfate
E.
hydrogen carbonate
Question #29
What is the formula of the nitride ion?
A.
NO3-
B.
NO33-
C.
NO32-
D.
N3-
E.
NO2-
Question #30
The name of the HSO4- ion is
A.
hydrogen sulfite.
B.
sulfide.
C.
sulfate.
D.
hydrogen sulfate.
E.
sulfite.
Question #31
What is the formula of a compound that contains Na+ and PO43- ions?
A.
Na3P
B.
NaPO4
C.
Na3PO4
D.
Na3PO3
E.
Na2PO3
Question #32
Fe2(SO4)3 is called
A.
iron (III) sulfate.
B.
iron (II) sulfate.
C.
iron trisulfate.
D.
diiron trisulfate.
E.
iron sulfate.
Question #33
What is the formula for aluminum nitrate?
A.
AlNO3
B.
Al2(NO2)2
C.
Al(NO2)3
D.
Al2NO2
E.
Al(NO3)3
Question #34
When a cation is formed from a representative element
A.
the cation acquires a negative charge.
B.
electrons are lost and the ion is smaller
C.
electrons are gained and the ion is larger.
D.
electrons are lost and the ion is larger.
E.
electrons are gained and the ion is smaller.
Question #35
To form an ion, a sodium atom
A.
gains one electron.
B.
gains two electrons.
C.
loses seven electrons.
D.
loses one electron.
E.
loses two electrons.
Question #36
The carbon tetrachloride molecule, CCl4, is
A.
a polar molecule with polar bonds.
B.
a polar molecule with ionic bonds.
C.
a polar molecule with nonpolar bonds.
D.
a nonpolar molecule with nonpolar bonds.
E.
a nonpolar molecule with polar bonds.
Question #37
A.
has a negative charge.
B.
forms covalent bonds.
C.
contains a group of two or more atoms with a positive charge.
D.
has a positive charge.
E.
contains a metal and a nonmetal.
Question #38
What is the ionic charge of an ion with 18 protons and 15 electrons?
A.
3-
B.
3+
C.
2+
D.
2-
E.
1+
Question #39
Elements in group 2A(2) of the periodic table form ions with a charge of
A.
3+.
B.
1-.
C.
1+.
D.
0
E.
2+.
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