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