Question 1

When H2S gas is dissolved in water, what is the name of the resulting binary acid?

Accepted Answer

A)  hydrogen sulfuric acid
B)  sulfuric acid
C)  hydrosulfuric acid
D)  bihydrosulfuric acid
E)  hydrosulfic acid

Question 2

Rank the following ionic compounds in order of increasing lattice energy (the largest lattice energy is the most negative): MgF2, MgCl2, MgBr2, MgI2.Explain your ranking.

Accepted Answer

MgI₂

MgBr₂

Question 3

Carbonyl fluoride (COF2) is similar in structure to phosgene (COCl2), and both are highly toxic.Draw the Lewis structure of COF2.

Accepted Answer

Question 4

Which group of elements is listed in order of increasing electronegativity?

Accepted Answer

A)  F  <\lt<  Cl  <\lt<  Ge  <\lt<  Sn
B)  Rb  <\lt<  Ca  <\lt<  Sc  <\lt<  Cs
C)  Zr  <\lt< V  <\lt<  Nb  <\lt<  Ta
D)  In  <\lt< Ga  <\lt< Al  <\lt<  C
E)  Cl  <\lt< Br  <\lt<  I  <\lt<  F

Question 5

Which bond below is most likely polar covalent?

Accepted Answer

A)  Na -Cl
B)  H - H
C)  Ca - O
D)  K - F
E)  C - N

Question 6

How many shared electron pairs are there in the Lewis structure of OF2?

Accepted Answer

A)  6
B)  4
C)  3
D)  2
E)  1

Question 7

Which is the correct formula for bromous acid?

Accepted Answer

A)  HBr
B)  HBrO4
C)  HBrO3
D)  HBrO2
E)  HBrO

Question 8

Which of the following statements regarding bond strength and length is true?

Accepted Answer

A)  Energy is released when bonded atoms separate.
B)  The length of a bond is the distance between two atoms when the potential energy of attraction between them is zero.
C)  Bond strength increases as the distance between two atoms decreases.
D)  When multiple pairs of electrons are shared between two atoms, bond strength decreases due to electron repulsions.
E)  The length of a bond is generally inversely proportional to its strength.

Question 9

Describe the relationship between bond order, bond energy, and bond length.

Accepted Answer

As the bond order in...

Question 10

In which bond does the H atom have the highest electron density?

Accepted Answer

A)  H -Cl
B)  H - Li
C)  H -N
D)  H -O
E)  H -C

Question 11

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

Accepted Answer

A)    −5.1×10−19 J -5.1 	imes 10^{-19} \mathrm{~J} −5.1×10−19 J 
B)    −1.0×10−18 J -1.0 	imes 10^{-18} \mathrm{~J} −1.0×10−18 J 
C)    −1.3×10−18 J -1.3 	imes 10^{-18} \mathrm{~J} −1.3×10−18 J 
D)    −8.6×10−19 J -8.6 	imes 10^{-19} \mathrm{~J} −8.6×10−19 J 
E)    −1.7×10−18 J -1.7 	imes 10^{-18} \mathrm{~J} −1.7×10−18 J

Question 12

What types of bonds form between the chlorine and oxygen atoms of the chlorite ion (ClO2-) ?

Accepted Answer

A)  single
B)  between single and double
C)  double
D)  triple
E)  between double and triple

Question 13

How many shared electron pairs are there in the Lewis structure of C2H4Cl2?

Accepted Answer

A)  12
B)  11
C)  8
D)  7
E)  5

Question 14

Which compound below would you expect to have the smallest (least negative)  lattice energy?

Accepted Answer

A)  MgBr2
B)  CaBr2
C)  CaO
D)  BaBr2
E)  BaO

Question 15

Which statement below regarding bond polarity is FALSE?

Accepted Answer

A)  Electrons are shared fairly equally in nonpolar bonds.
B)  Electrons are shared unequally in polar bonds.
C)  Polar bonds possess a small electric dipole.
D)  Atoms sharing electrons in nonpolar bonds do not have partial charges.
E)  Electrons in polar bonds are transferred from one atom to another.

Question 16

What is the formal charge of the carbon atom in the best Lewis structure for carbonyl sulfide (OCS) ?

Accepted Answer

A)  0
B)  (-2) 
C)  (+1) 
D)  (+2) 
E)  (+4)

Question 17

Which structure for dinitrogen sulfide (N - N - S or N - S -N)  is the more stable?

Accepted Answer

A)  N - N - S, because the formal charges can all be zero.
B)  N - N - S, because the formal charges can be reduced to the lowest possible values.
C)  N - S - N, because the formal charges can be reduced to the lowest possible values.
D)  N - S - N, because the formal charges can all be zero.
E)  N - S -N, because sulfur is less electronegative than nitrogen.

Question 18

Sodium nitrite, which is used in meat processing, has been implicated as a possible health hazard because it can react with amines present in meat to form trace quantities of carcinogenic nitrosamines.What is the formula of sodium nitrite?

Accepted Answer

A)  SNO
B)  NaNO2
C)  NaNO3
D)  Na2NO4
E)  Na2NO2

Question 19

Which information below is NOT shown in Lewis structures of molecules?

Accepted Answer

A)  how atoms are arranged in space
B)  the number of bonding pairs of electrons between atoms
C)  nonbonding electrons on atoms
D)  the order in which atoms are linked
E)  the number of valence electrons in the molecule

Question 20

Hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) have the same elemental composition.Is one structure more stable than the other? Support your answer with the Lewis structures and formal charges assigned to each atom for these molecules.

Accepted Answer

The formal charges are zero ...

Exam 4: Chemical Bonding Understanding Climate Change

Which compound below would you expect to have the smallest (least negative) lattice energy?

Correct AnswerverifiedShow Answer

Sodium nitrite, which is used in meat processing, has been implicated as a possible health hazard because it can react with amines present in meat to form trace quantities of carcinogenic nitrosamines.What is the formula of sodium nitrite?

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How many shared electron pairs are there in the Lewis structure of OF2?

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Which statement below regarding bond polarity is FALSE?

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Describe the relationship between bond order, bond energy, and bond length.

Correct AnswerverifiedAs the bond order in...View AnswerShow Answer

Rank the following ionic compounds in order of increasing lattice energy (the largest lattice energy is the most negative): MgF2, MgCl2, MgBr2, MgI2.Explain your ranking.

Correct AnswerverifiedMgI2 MgBr2View AnswerShow Answer

Which of the following statements regarding bond strength and length is true?

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Which is the correct formula for bromous acid?

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Carbonyl fluoride (COF2) is similar in structure to phosgene (COCl2), and both are highly toxic.Draw the Lewis structure of COF2.

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Which information below is NOT shown in Lewis structures of molecules?

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Which bond below is most likely polar covalent?

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What is the formal charge of the carbon atom in the best Lewis structure for carbonyl sulfide (OCS) ?

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How many shared electron pairs are there in the Lewis structure of C2H4Cl2?

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Hydrogen isocyanide (HNC) and hydrogen cyanide (HCN) have the same elemental composition.Is one structure more stable than the other? Support your answer with the Lewis structures and formal charges assigned to each atom for these molecules.

Correct Answerverified The formal charges are zero ...View AnswerShow Answer

Which structure for dinitrogen sulfide (N - N - S or N - S -N) is the more stable?

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Which group of elements is listed in order of increasing electronegativity?

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

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In which bond does the H atom have the highest electron density?

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What types of bonds form between the chlorine and oxygen atoms of the chlorite ion (ClO2-) ?

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When H2S gas is dissolved in water, what is the name of the resulting binary acid?

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How many shared electron pairs are there in the Lewis structure of OF₂?

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As the bond order in...
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Rank the following ionic compounds in order of increasing lattice energy (the largest lattice energy is the most negative): MgF₂, MgCl₂, MgBr₂, MgI₂.Explain your ranking.

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MgI₂ MgBr_{2View Answer}

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Carbonyl fluoride (COF₂) is similar in structure to phosgene (COCl₂), and both are highly toxic.Draw the Lewis structure of COF₂.

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How many shared electron pairs are there in the Lewis structure of C₂H₄Cl₂?

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The formal charges are zero ...
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What types of bonds form between the chlorine and oxygen atoms of the chlorite ion (ClO₂-) ?

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When H₂S gas is dissolved in water, what is the name of the resulting binary acid?

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