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Homework Week 2

Navigation   » List of Schools  »  West Los Angeles College  »  Chemistry  »  Chem 051 – Fundamentals of Chemistry  »  Winter 2021  »  Homework Week 2

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Below are the questions for the exam with the choices of answers:

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