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