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