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