Question 1

Based on electronegativity trends in the periodic table,predict which of the following compounds will have the greatest % ionic character in its bonds.

Accepted Answer

A)  H2O
B)  LiI
C)  CaO
D)  RbF
E)  HClF) C) and E)
G) B) and C)

Question 2

Covalently bonded substances do not necessarily exist as separate molecules.

Accepted Answer

A) True 
 B)False

Question 3

Combustion of a fat will release more energy than combustion of an equal mass of carbohydrate because

Accepted Answer

A)  fats contain more bonds to oxygen than carbohydrates.
B)  fats contain fewer bonds to oxygen than carbohydrates.
C)  the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the carbon-oxygen and oxygen-hydrogen bonds in the reaction products (carbon dioxide and water) .
D)  the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the bonds in carbohydrates.
E)  fats have higher molar masses than carbohydrates.F) B) and E)
G) A) and B)

Question 4

In which of these substances are the atoms held together by polar covalent bonding?

Accepted Answer

A)  SrCl2
B)  CsCl
C)  ClF
D)  TiF2
E)  S8F) C) and D)
G) A) and B)

Question 5

Which of the following is a covalent compound?

Accepted Answer

A)  Na2O
B)  CaCl2
C)  Cl2O
D)  CsCl
E)  Al2O3F) A) and D)
G) C) and D)

Question 6

Analysis of an unknown substance showed that it has a high boiling point and is brittle.It is an insulator as a solid but conducts electricity when melted.Which of the following substances would have those characteristics?

Accepted Answer

A)  HCl
B)  Al
C)  KBr
D)  SiF4
E)  I2F) None of the above
G) C) and D)

Question 7

Which of the following contains covalent bonds?

Accepted Answer

A)  BaO
B)  IBr
C)  Mg
D)  LiBr
E)  CuF) A) and B)
G) C) and E)

Question 8

The lattice energy of MgCl2 is the energy change for which one of the following processes?

Accepted Answer

A)  Mg(s) + Cl2(g)   →	o→  MgCl2(s) 
B)  Mg(g) + 2Cl(g)   →	o→ MgCl2(s) 
C)  Mg2+(s) + 2Cl-(g)   →	o→  MgCl2(g) 
D)  Mg2+(g) + 2Cl-(g)   →	o→  MgCl2(s) 
E)  MgCl2(aq)   →	o→  MgCl2(s)  F) B) and D)
G) A) and E)

Question 9

Arrange the following bonds in order of increasing bond strength.

Accepted Answer

A)  C-I 
B)  C-F 
C)  C-Br 
D)  C-I 
E)  None of these orders is correct.F) A) and B)
G) A) and C)

Question 10

The majority of elements are good electrical conductors when in solid form.

Accepted Answer

A) True 
 B)False

Question 11

The more C-O and O-H bonds there are in a substance,the greater will be the amount of heat released when a fixed mass of the substance is burned.

Accepted Answer

A) True 
 B)False

Question 12

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Accepted Answer

A) True 
 B)False

Question 13

Select the compound with the lowest lattice energy.

Accepted Answer

A)  CsBr(s) 
B)  NaCl(s) 
C)  SrO(s) 
D)  CaO(s) 
E)  KBr(s) F) D) and E)
G) C) and D)

Question 14

Which of the following is an ionic compound?

Accepted Answer

A)  H2S
B)  NH3
C)  I2
D)  KI
E)  CCl4F) B) and C)
G) All of the above

Question 15

Arrange oxygen,sulfur,calcium,rubidium and potassium in order of decreasing electronegativity.

Accepted Answer

A)  O > S > Ca > K > Rb
B)  O > S > Ca > Rb > K
C)  O > S > Rb > K > Ca
D)  O > S > Rb > Ca > K
E)  None of these orders is correct.F) A) and B)
G) All of the above

Question 16

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond.Calculate the enthalpy of reaction using the bond energies given.

Accepted Answer

A)  -484 kJ
B)  -366 kJ
C)  -48 kJ
D)  +48 kJ
E)  +366 kJF) A) and E)
G) A) and B)

Question 17

Ionic bonding typically occurs when a ______________ bonds with a ______________.

Accepted Answer

The answer of Ionic bonding typically occurs when a ______________...

Question 18

Give a clear and concise definition of the term "electronegativity";i.e. ,what does it measure?

Accepted Answer

Electronegativity measures an ...

Question 19

Select the element whose Lewis symbol is correct.

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and E)
G) A) and B)

Question 20

Which of the following compounds displays the greatest ionic character in its bonds?

Accepted Answer

A)  NO2
B)  CO2
C)  H2O
D)  HF
E)  NH3F) A) and B)
G) B) and E)

Exam 9: Models of Chemical Bonding

Select the element whose Lewis symbol is correct.

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The lattice energy of MgCl2 is the energy change for which one of the following processes?

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Analysis of an unknown substance showed that it has a high boiling point and is brittle.It is an insulator as a solid but conducts electricity when melted.Which of the following substances would have those characteristics?

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Select the compound with the lowest lattice energy.

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Which of the following is an ionic compound?

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In which of these substances are the atoms held together by polar covalent bonding?

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Which of the following is a covalent compound?

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Which of the following compounds displays the greatest ionic character in its bonds?

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The more C-O and O-H bonds there are in a substance,the greater will be the amount of heat released when a fixed mass of the substance is burned.

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Arrange oxygen,sulfur,calcium,rubidium and potassium in order of decreasing electronegativity.

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Arrange the following bonds in order of increasing bond strength.

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The majority of elements are good electrical conductors when in solid form.

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Give a clear and concise definition of the term "electronegativity";i.e. ,what does it measure?

Correct AnswerverifiedElectronegativity measures an ...View AnswerShow Answer

Covalently bonded substances do not necessarily exist as separate molecules.

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Which of the following contains covalent bonds?

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Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond.Calculate the enthalpy of reaction using the bond energies given.

Correct AnswerverifiedShow Answer

Based on electronegativity trends in the periodic table,predict which of the following compounds will have the greatest % ionic character in its bonds.

Correct AnswerverifiedShow Answer

Ionic bonding typically occurs when a ______________ bonds with a ______________.

Correct AnswerverifiedShow Answer

Combustion of a fat will release more energy than combustion of an equal mass of carbohydrate because

Correct AnswerverifiedShow Answer

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Correct AnswerverifiedShow Answer

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The lattice energy of MgCl₂ is the energy change for which one of the following processes?

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Electronegativity measures an ...
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Ionic bonding typically occurs when a bonds with a .

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