Question 1

Covalently bonded substances do not necessarily exist as separate molecules.

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

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

Question 3

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) All of the above
G) C) and D)

Question 4

The diameter of a chloride ion is 362 pm, and the diameter of a potassium ion is 276 pm. What is the distance between the nuclei of adjacent chloride and potassium ions in solid potassium chloride?

Accepted Answer

A)   1276 pm
B)   638 pm
C)   319 pm
D)   181 pm
E)   138 pmF) B) and C)
G) B) and E)

Question 5

Calculate the lattice energy of magnesium sulfide from the data given below.

A) -3406 kJ/mol
B) -2720. kJ/mol
C) 2720. kJ/mol
D)3406 kJ/mol
E)none of the above

Accepted Answer

The answer of Calculate the lattice energy of magnesium sulfide...

Question 6

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

Accepted Answer

A)   CO2
B)   Si
C)   Br2
D)   S8
E)   CrF) A) and C)
G) B) and D)

Question 7

Which of the following is an ionic compound?

Accepted Answer

A)   H2S
B)   NH3
C)   I2
D)   KI
E)   CCl4F) D) and E)
G) C) and D)

Question 8

Arrange aluminum, nitrogen, phosphorus, and indium in order of increasing electronegativity.

Accepted Answer

A)   Al 
B)   Al 
C)   In 
D)   In 
E)   None of the above orders is correct.F) A) and C)
G) D) and E)

Question 9

Bond energy increases as bond order increases, for bonding between a given pair of atoms.

Accepted Answer

A) True 
 B)False

Question 10

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 11

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

Accepted Answer

A) True 
 B)False

Question 12

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 the above orders is correct.F) B) and C)
G) A) and E)

Question 13

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) A) and B)
G) A) and C)

Question 14

Select the correct formula for a compound formed from barium and nitrogen.

Accepted Answer

A)   BaN
B)   BaN2
C)   Ba2N3
D)   Ba2N
E)   Ba3N2F) A) and B)
G) A) and E)

Question 15

Select the element whose Lewis symbol is correct.

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) C) and D)
G) None of the above

Question 16

The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?

Accepted Answer

A)   Ca2+(s)  + 2F-(g)   CaF2(g) 
B)   CaF2(g)   CaF2(s) 
C)   Ca(g)  + 2F(g)   CaF2(s) 
D)   CaF2(aq)   CaF2(s) 
E)   none of the aboveF) All of the above
G) C) and E)

Question 17

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) C) and D)
G) B) and C)

Question 18

Using the bond energies provided below, calculate H° for the reaction CH4(g)  + 4Cl2(g)   CCl4(g)  + 4HCl(g) 
Bond energies: C-H = 413 kJ/mol, Cl-Cl = 243 kJ/mol, C-Cl = 339 kJ/mol, H-Cl = 427 kJ/mol

Accepted Answer

A)   1422 kJ
B)   440 kJ
C)   110 kJ
D)   -110 kJ
E)   - 440 kJF) B) and E)
G) C) and D)

Question 19

The lattice energy of rubidium chloride is the energy change accompanying the process
Rb+(g) + Cl-(g) F1F1F1S1F1F1F10 RbCl(s)
Calculate the lattice energy of RbCl using the following data:   Cl2(g) F1F1F1S1F1F1F10 RbCl(s)

Accepted Answer

Lattice en...

Question 20

For which of the following elements (in their normal, stable, forms)  would it be correct to describe the bonding as involving "electron pooling"?

Accepted Answer

A)   hydrogen
B)   helium
C)   sulfur
D)   iodine
E)   aluminumF) None of the above
G) C) and E)

Exam 9: Models of Chemical Bonding

Calculate the lattice energy of magnesium sulfide from the data given below. A) -3406 kJ/mol B) -2720. kJ/mol C) 2720. kJ/mol D)3406 kJ/mol E)none of the above

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Select the element whose Lewis symbol is correct.

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The lattice energy of rubidium chloride is the energy change accompanying the process Rb+(g) + Cl-(g)  RbCl(s) Calculate the lattice energy of RbCl using the following data: Cl2(g)  RbCl(s)

Correct AnswerverifiedLattice en...View AnswerShow Answer

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

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Which of the following is an ionic compound?

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For which of the following elements (in their normal, stable, forms) would it be correct to describe the bonding as involving "electron pooling"?

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Arrange the following bonds in order of increasing bond strength.

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Using the bond energies provided below, calculate H° for the reaction CH4(g) + 4Cl2(g)  CCl4(g) + 4HCl(g) Bond energies: C-H = 413 kJ/mol, Cl-Cl = 243 kJ/mol, C-Cl = 339 kJ/mol, H-Cl = 427 kJ/mol

Correct AnswerverifiedShow Answer

The diameter of a chloride ion is 362 pm, and the diameter of a potassium ion is 276 pm. What is the distance between the nuclei of adjacent chloride and potassium ions in solid potassium chloride?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Arrange aluminum, nitrogen, phosphorus, and indium in order of increasing electronegativity.

Correct AnswerverifiedShow Answer

Bond energy increases as bond order increases, for bonding between a given pair of atoms.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?

Correct AnswerverifiedShow Answer

Select the correct formula for a compound formed from barium and nitrogen.

Correct AnswerverifiedShow Answer

Covalently bonded substances do not necessarily exist as separate molecules.

Correct AnswerverifiedShow Answer

Correct Answer
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The lattice energy of rubidium chloride is the energy change accompanying the process Rb⁺(g) + Cl^-(g)  RbCl(s) Calculate the lattice energy of RbCl using the following data: Cl₂(g)  RbCl(s)

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Lattice en...
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Using the bond energies provided below, calculate H° for the reaction CH₄(g) + 4Cl₂(g)  CCl₄(g) + 4HCl(g) Bond energies: C-H = 413 kJ/mol, Cl-Cl = 243 kJ/mol, C-Cl = 339 kJ/mol, H-Cl = 427 kJ/mol

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The lattice energy of CaF₂ is the energy change for which one, if any, of the following processes?

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