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