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