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