Question 1

Given the electronegativities below, which covalent single bond is most polar? Element: H C N O
Electronegativity: 2.1 2.5 3.0 3.5

Accepted Answer

A)  C-H
B)  N-H
C)  O-H
D)  O-C
E)  O-NF) A) and D)
G) B) and E)

Question 2

The ________ ion has a noble gas electron configuration.

Accepted Answer

A)  Cl-
B)  F2-
C)  F
D)  S2+
E)  O-F) A) and B)
G) A) and E)

Question 3

A ________ covalent bond between the same two atoms is the longest.

Accepted Answer

A)  single
B)  double
C)  triple
D)  strong
E)  They are all the same length.F) None of the above
G) All of the above

Question 4

In the Lewis symbol for a nitrogen atom, there are ________ paired and ________ unpaired electrons.

Accepted Answer

A)  two, three
B)  one, three
C)  three, two
D)  zero, five
E)  two, twoF) D) and E)
G) A) and C)

Question 5

The ion PO43- has ________ valence electrons.

Accepted Answer

A)  14
B)  24
C)  27
D)  29
E)  32F) B) and D)
G) B) and C)

Question 6

Polyatomic ions with an odd number of electrons will ________ the octet rule.

Accepted Answer

The answer of Polyatomic ions with an odd number of...

Question 7

A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

Accepted Answer

A)  PO43-
B)  SiF4
C)  CF4
D)  SeF4
E)  NF3F) A) and B)
G) C) and D)

Question 8

Why don't we draw double bonds between the Be atom and the Cl atoms in BeCl2?

Accepted Answer

A)  That would give positive formal charges to the chlorine atoms and a negative formal charge to the beryllium atom.
B)  There aren't enough electrons.
C)  That would result in more than eight electrons around beryllium.
D)  That would result in more than eight electrons around each chlorine atom.
E)  That would result in the formal charges not adding up to zero.F) D) and E)
G) A) and E)

Question 9

A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

Accepted Answer

A)  NI3
B)  SO2
C)  ICl5
D)  SiF4
E)  CO2F) None of the above
G) A) and B)

Question 10

Which atom can accommodate an octet of electrons, but doesn't necessarily have to accommodate an octet?

Accepted Answer

A)  N
B)  C
C)  H
D)  O
E)  BF) D) and E)
G) C) and E)

Question 11

Based on the octet rule, iodine most likely forms an ________ ion.

Accepted Answer

A)  I2+
B)  I4+
C)  I4-
D)  I+
E)  I-F) None of the above
G) C) and D)

Question 12

A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

Accepted Answer

A)  NF3
B)  IF3
C)  PF3
D)  SbF3
E)  SO42-F) C) and D)
G) A) and B)

Question 13

The greater the lattice energy, the greater the charges on the participatory ions and the smaller their radii.

Accepted Answer

A) True 
 B)False

Question 14

The oxidation number of iron in Fe2O3 is ________.

Accepted Answer

A)  -2
B)  +1
C)  +3
D)  +2
E)  -3F) A) and D)
G) All of the above

Question 15

The formula of palladium (IV) sulfide is ________.

Accepted Answer

A)  Pd2S4
B)  PdS4
C)  Pd4S
D)  PdS2
E)  Pd2S2F) None of the above
G) C) and E)

Question 16

To convert from one resonance structure to another, ________.

Accepted Answer

A)  only atoms can be moved
B)  electrons and atoms can both be moved
C)  only electrons can be moved
D)  neither electrons nor atoms can be moved
E)  electrons must be addedF) C) and E)
G) All of the above

Question 17

Lattice energy is ________.

Accepted Answer

A)  the energy required to convert a mole of ionic solid into its constituent ions in the gas phase
B)  the energy given off when gaseous ions combine to form one mole of an ionic solid
C)  the energy required to produce one mole of an ionic compound from its constituent elements in their standard states
D)  the sum of ionization energies of the components in an ionic solid
E)  the sum of electron affinities of the components in an ionic solidF) All of the above
G) A) and E)

Question 18

Most explosives are compounds that decompose rapidly to produce ________ products and a great deal of ________.

Accepted Answer

A)  gaseous, gases
B)  liquid, heat
C)  soluble, heat
D)  solid, gas
E)  gaseous, heatF) C) and D)
G) All of the above

Question 19

Ru+ ions are represented by the electron configuration ________.

Accepted Answer

A)  [Kr]5s14d6
B)  [Kr]5s24d5
C)  [Kr]5s24d7
D)  [Kr]4d5
E)  [Ar]4s13d6F) None of the above
G) A) and D)

Question 20

The ________ ion has a noble gas electron configuration.

Accepted Answer

A)  Be2+
B)  Li2+
C)  Li
D)  Mg2-
E)  Al2+F) A) and E)
G) A) and B)

Exam 8: Basic Concepts of Chemical Bonding

Polyatomic ions with an odd number of electrons will ________ the octet rule.

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The ion PO43- has ________ valence electrons.

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Which atom can accommodate an octet of electrons, but doesn't necessarily have to accommodate an octet?

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The greater the lattice energy, the greater the charges on the participatory ions and the smaller their radii.

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Based on the octet rule, iodine most likely forms an ________ ion.

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Why don't we draw double bonds between the Be atom and the Cl atoms in BeCl2?

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The formula of palladium (IV) sulfide is ________.

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A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

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The ________ ion has a noble gas electron configuration.

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Lattice energy is ________.

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Most explosives are compounds that decompose rapidly to produce ________ products and a great deal of ________.

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To convert from one resonance structure to another, ________.

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A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

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In the Lewis symbol for a nitrogen atom, there are ________ paired and ________ unpaired electrons.

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A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

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Ru+ ions are represented by the electron configuration ________.

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The ________ ion has a noble gas electron configuration.

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The oxidation number of iron in Fe2O3 is ________.

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A ________ covalent bond between the same two atoms is the longest.

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Given the electronegativities below, which covalent single bond is most polar? Element: H C N O Electronegativity: 2.1 2.5 3.0 3.5

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The ion PO₄^3-has ________ valence electrons.

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Why don't we draw double bonds between the Be atom and the Cl atoms in BeCl₂?

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Most explosives are compounds that decompose rapidly to produce products and a great deal of .

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In the Lewis symbol for a nitrogen atom, there are paired and unpaired electrons.

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Ru⁺ ions are represented by the electron configuration ________.

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The oxidation number of iron in Fe₂O₃ is ________.

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