Question 1

Which of the following ions does NOT have either an empty valence shell or a complete valence-shell octet?

Accepted Answer

A)  Al3+
B)  I-
C)  Ca2+
D)  Pb2+
E)  Se2-

Question 2

Three reasonable resonance structures are shown for the cyanate ion,OCN-.Assign formal charges to each atom.Which structure,if any,contributes most heavily to the resonance hybrid structure,and why?
(A)  (B)  (C)

Accepted Answer

(A)0,0,-1; (B)-1,0,0; (C)+1,0,-2 (B)prob...

Question 3

Draw the Lewis structure for the nitrate anion,NO3-.Include resonance structures if necessary.

Accepted Answer

_TB6561_00
Two other structur...

Question 4

Calculate the electrostatic potential energy in J of the interaction of one magnesium ion (86 pm radius) and one bromide ion (182 pm radius) in magnesium bromide.

Accepted Answer

A)  -5.1  ×	imes×  10-19 J
B)  -1.0  ×	imes×  10-18 J
C)  -1.3  ×	imes×  10-18 J
D)  -8.6  ×	imes×  10-19 J
E)  -1.7  ×	imes×  10-18 J

Question 5

How many valence electrons does S2- have?

Accepted Answer

A)  8
B)  6
C)  16
D)  4
E)  14

Question 6

You synthesize a new radon compound in which the central radon atom is bonded to four fluorine atoms and two oxygen atoms.How many valence electrons does its Lewis structure contain?

Accepted Answer

A)  48
B)  32
C)  28
D)  12
E)  8

Question 7

Draw the Lewis structure for the carbonate anion,CO32-.Include resonance structures if necessary.

Accepted Answer

_TB6561_00
Two additional str...

Question 8

Buffer solutions that maintain certain levels of pH or acidity are widely used in biochemical experiments.One common buffer system uses sodium dihydrogenphosphate and sodium monohydrogenphosphate.What are the formulas of these two compounds?

Accepted Answer

A)  Na(HPO4) and Na(HPO4) 2
B)  NaH2PO4 and Na2HPO4
C)  Na2H2PO4 and NaHPO4
D)  NaPO4 and NaHPO4

Question 9

Which one of the following formula-name combinations is NOT correct?

Accepted Answer

A)  sulfur monoxide: SO
B)  sulfur dioxide: SO2
C)  sulfur trioxide: SO3
D)  disulfur monoxide: S2O
E)  heptasulfur oxide: S6O

Question 10

Based on its Lewis dot structure and the octet rule,which of the following has the highest bonding capacity when paired with another nonmetal?

Accepted Answer

A)  F
B)  H
C)  O
D)  N
E)  C

Question 11

Which of the following has 13 valence electrons in its Lewis structure?

Accepted Answer

A)  SH-
B)  IO
C)  NO
D)  ICl
E)  Cl2

Question 12

You create a new bismuth compound.Which of the following statements is probably true about your compound?

Accepted Answer

A)  It is probably ionic and bismuth probably has a +3 charge.
B)  It is probably ionic and bismuth probably has a -3 charge.
C)  The potential energy between the atoms (or ions) will be positive because bismuth is so large.
D)  It is probably covalent because bismuth is a column VA nonmetal.
E)  Bismuth does not form any stable compounds because it is radioactive.

Question 13

Rank the following ionic compounds in order of increasing lattice energy (largest lattice energy is the most negative): MgCl2,NaCl,KCl,MgO.

Accepted Answer

KCl < NaCl < MgCl₂ < MgO Lattic...

Question 14

Identify the molecule below that contains a double bond.

Accepted Answer

A)  HCN
B)  ICl
C)  C2H2
D)  S2
E)  N2

Question 15

Chlorofluorocarbons (CFCs or freons)are linked to the depletion of atmospheric ozone.Draw the Lewis structure of Freon-1113,C2ClF3.

Accepted Answer

Question 16

Which of the following is the correct Lewis symbol for the oxide anion (O2-) ? 2-) ?   A) a B) b C) c D) d E) none of these is correct" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  none of these is correct

Question 17

What is the correct name for B2O3?

Accepted Answer

Question 18

Ethanethiol and dimethyl sulfide share the same chemical formula but different bonding arrangements.Ethanethiol has a central carbon,whereas dimethyl sulfide has a central sulfur.Draw their Lewis structures.

Accepted Answer

The answer of Ethanethiol and dimethyl sulfide share the same...

Question 19

Draw the Lewis structures of PCl3 and PCl5.

Accepted Answer

The answer of Draw the Lewis structures of PCl3 and...

Question 20

One reason electronegativity increases from left to right across a period is __________

Accepted Answer

A)  increased shielding of valence electrons by the core electrons.
B)  an increase in the number of protons in the nucleus.
C)  a decrease in the effective nuclear charge (Zeff) .
D)  an increase in the shielding of core electrons by the valence electrons.
E)  a decrease in the ionization potential.

Exam 4: Chemical Bonding-Understanding Climate Change

Chlorofluorocarbons (CFCs or freons)are linked to the depletion of atmospheric ozone.Draw the Lewis structure of Freon-1113,C2ClF3.

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How many valence electrons does S2- have?

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Buffer solutions that maintain certain levels of pH or acidity are widely used in biochemical experiments.One common buffer system uses sodium dihydrogenphosphate and sodium monohydrogenphosphate.What are the formulas of these two compounds?

Correct AnswerverifiedShow Answer

Identify the molecule below that contains a double bond.

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Draw the Lewis structure for the nitrate anion,NO3-.Include resonance structures if necessary.

Correct Answerverified_TB6561_00 Two other structur...View AnswerShow Answer

Which of the following ions does NOT have either an empty valence shell or a complete valence-shell octet?

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What is the correct name for B2O3?

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One reason electronegativity increases from left to right across a period is __________

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Three reasonable resonance structures are shown for the cyanate ion,OCN-.Assign formal charges to each atom.Which structure,if any,contributes most heavily to the resonance hybrid structure,and why? (A) (B) (C)

Correct Answerverified(A)0,0,-1; (B)-1,0,0; (C)+1,0,-2 (B)prob...View AnswerShow Answer

Which of the following is the correct Lewis symbol for the oxide anion (O2-) ?

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You synthesize a new radon compound in which the central radon atom is bonded to four fluorine atoms and two oxygen atoms.How many valence electrons does its Lewis structure contain?

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Ethanethiol and dimethyl sulfide share the same chemical formula but different bonding arrangements.Ethanethiol has a central carbon,whereas dimethyl sulfide has a central sulfur.Draw their Lewis structures.

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Which of the following has 13 valence electrons in its Lewis structure?

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Rank the following ionic compounds in order of increasing lattice energy (largest lattice energy is the most negative): MgCl2,NaCl,KCl,MgO.

Correct AnswerverifiedKCl < NaCl < MgCl2 < MgO Lattic...View AnswerShow Answer

Draw the Lewis structure for the carbonate anion,CO32-.Include resonance structures if necessary.

Correct Answerverified_TB6561_00 Two additional str...View AnswerShow Answer

Which one of the following formula-name combinations is NOT correct?

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Draw the Lewis structures of PCl3 and PCl5.

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Calculate the electrostatic potential energy in J of the interaction of one magnesium ion (86 pm radius) and one bromide ion (182 pm radius) in magnesium bromide.

Correct AnswerverifiedShow Answer

Based on its Lewis dot structure and the octet rule,which of the following has the highest bonding capacity when paired with another nonmetal?

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You create a new bismuth compound.Which of the following statements is probably true about your compound?

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Chlorofluorocarbons (CFCs or freons)are linked to the depletion of atmospheric ozone.Draw the Lewis structure of Freon-1113,C₂ClF₃.

Correct Answer
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How many valence electrons does S²^- have?

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Draw the Lewis structure for the nitrate anion,NO₃^-.Include resonance structures if necessary.

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Two other structur...
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What is the correct name for B₂O₃?

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Three reasonable resonance structures are shown for the cyanate ion,OCN^-.Assign formal charges to each atom.Which structure,if any,contributes most heavily to the resonance hybrid structure,and why? (A) (B) (C)

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(A)0,0,-1; (B)-1,0,0; (C)+1,0,-2 (B)prob...
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Which of the following is the correct Lewis symbol for the oxide anion (O²^-) ?

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Rank the following ionic compounds in order of increasing lattice energy (largest lattice energy is the most negative): MgCl₂,NaCl,KCl,MgO.

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KCl < NaCl < MgCl₂ < MgO Lattic...
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Draw the Lewis structure for the carbonate anion,CO₃²^-.Include resonance structures if necessary.

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_TB6561_00
Two additional str...
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Draw the Lewis structures of PCl₃ and PCl₅.

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