Question 1

Which molecule contains a triple bond?

Accepted Answer

A)   C2H4
B)   CCl4
C)   H2O
D)   N2
E)   O2F) A) and B)
G) A) and C)

Question 2

Which statement properly describes the formal charges on the atoms in  ?

Accepted Answer

A)   -2 on oxygen, +5 on phosphorus
B)   -1 on oxygen, +4 on phosphorus
C)   -1 on oxygen, +1 on phosphorus
D)   +1 on oxygen, -1 on phosphorus
E)   +1 on oxygen, -3 on phosphorusF) B) and E)
G) B) and D)

Question 3

Determine the number of electrons required by these four elements, in the order listed, to achieve an octet of electrons.

Accepted Answer

A)   1 3 2 4
B)   3 4 2 2
C)   3 2 4 1
D)   4 3 5 2
E)   5 6 4 7F) A) and B)
G) A) and C)

Question 4

What is the formal charge on sulfur in SO2?

Accepted Answer

A)   +2
B)   +1
C)   0
D)   -1
E)   -2F) None of the above
G) A) and E)

Question 5

Which bond is longest?

Accepted Answer

A)   C-O
B)   C-I
C)   C-Br
D)   C-C
E)   C-NF) B) and C)
G) A) and B) B

Question 6

Write the correct Lewis dot structure for O2. Which statement correctly describes the structure of the molecule?

Accepted Answer

A)   There is one double bond and four lone electron pairs.
B)   There is one double bond and six lone electron pairs.
C)   There is one single bond and four lone electron pairs.
D)   There is one single bond and six lone electron pairs.
E)   There is one single bond, one double bond, and six lone electron pairs.F) All of the above
G) A) and B)

Question 7

List these compounds in order of decreasing number of valence electrons: CO2, CH3Cl, HCN.

Accepted Answer

A)   CH3Cl, HCN, CO2
B)   CO2, HCN, CH3Cl
C)   CH3Cl, CO2, HCN
D)   CO2, CH3Cl, HCN
E)   HCN, CO2, CH3ClF) B) and D)
G) B) and E)

Question 8

How many electrons will be in the correctly drawn Lewis Structure for CCl4?

Accepted Answer

A)   32
B)   74
C)   35
D)   8
E)   11F) None of the above
G) A) and E)

Question 9

How many electrons will be in the correctly drawn Lewis Structure for  ?

Accepted Answer

A)   20
B)   22
C)   24
D)   26
E)   30F) A) and D)
G) A) and C)

Question 10

Benzene is an example of a resonance hybrid because it contains _____________ electrons.

Accepted Answer

The answer of Benzene is an example of a resonance...

Question 11

Write the correct Lewis dot structures for the compounds given below. Arrange them in order of shortest to longest bond lengths. Consider only the carbon-carbon and carbon-oxygen bonds. 2H6 2H4 2H2 2H2 2H4 2H6 C)  C2H2 2H4 2H6 2H2 2H4 2H6 E)  CO 2H6 2H4 2H2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   C2H6 2H4 2H2 
B)   C2H2 2H4 2H6
C)   C2H2 2H4 2H6 
D)   CO 2H2 2H4 2H6
E)   CO 2H6 2H4 2H2F) A) and C)
G) A) and B)

Question 12

Which bond is least polar?

Accepted Answer

A)   C-C
B)   C-N
C)   N-H
D)   C-F
E)   C-OF) C) and E)
G) D) and E)

Question 13

Which of the following compound can exhibit cis-trans isomerism?

Accepted Answer

A)   CH2=CH2
B)   CH3CH3
C)   H2C=O
D)   ClHC=CHCl
E)   Cl2C=CH2F) B) and E)
G) A) and E)

Question 14

Write the correct Lewis dot structure for CCl2O. Which statement correctly describes the structure?

Accepted Answer

A)   The structure contains 3 single bonds, 1 double bond, and 2 lone electron pairs.
B)   The structure contains 3 single bonds, 1 triple bond, and 8 lone electron pairs.
C)   The structure contains 2 single bonds, 1 double bond, and 2 lone electron pairs.
D)   The structure contains 2 single bonds, 1 double bond and 8 lone electron pairs.
E)   The structure contains 1 single bond, 1 triple bond, and 2 lone electron pairs.F) B) and E)
G) C) and D) D

Question 15

The ____________ of an element is its ability to pull electrons towards itself when participating in a covalent bond.

Accepted Answer

electronegativity

Question 16

Which statement about cis and trans isomers is false? The cis- and trans- isomers of a compound:

Accepted Answer

A)   Have the same chemical formulas
B)   Have the same molecular weights.
C)   Occur in compounds containing triple bonds.
D)   Have different boiling points.
E)   Have different melting points.F) C) and D)
G) All of the above

Question 17

From the data below, calculate the approximate enthalpy change for the reaction below.

Accepted Answer

A)   -806 kJ
B)   -98 kJ
C)   98 kJ
D)   120 kJ
E)   806 kJF) C) and D)
G) A) and B)

Question 18

Predict qualitatively the relative bond lengths of the four single bonds given below and arrange them from shortest to longest:

Accepted Answer

A)   C-C 
B)   N-N 
C)   F-F 
D)   O-O 
E)   C-C < F-F < N-N < O-OF) None of the above
G) A) and B)

Question 19

Assume all hydrocarbons given are linear. Which compound will contain no multiple bonds?

Accepted Answer

A)   C2H4
B)   C3H4
C)   C6H14
D)   C8H16
E)   C9H18F) A) and D)
G) D) and E)

Question 20

Write the singly bonded Lewis dot structure for BF3. Which statement best describes this structure?

Accepted Answer

A)   The octet rule is obeyed for all atoms.
B)   At least one atom has less than an octet of electrons.
C)   There is a lone pair of electrons on the boron atom.
D)   The boron atom has a formal charge of +1.
E)   At least one atom exceeds the octet rule.F) None of the above
G) D) and E)

Exam 8: Covalent Bonding

Which molecule contains a triple bond?

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Which statement properly describes the formal charges on the atoms in ?

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Determine the number of electrons required by these four elements, in the order listed, to achieve an octet of electrons.

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What is the formal charge on sulfur in SO2?

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Which bond is longest?

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Write the correct Lewis dot structure for O2. Which statement correctly describes the structure of the molecule?

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List these compounds in order of decreasing number of valence electrons: CO2, CH3Cl, HCN.

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How many electrons will be in the correctly drawn Lewis Structure for CCl4?

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How many electrons will be in the correctly drawn Lewis Structure for ?

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Benzene is an example of a resonance hybrid because it contains _____________ electrons.

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Write the correct Lewis dot structures for the compounds given below. Arrange them in order of shortest to longest bond lengths. Consider only the carbon-carbon and carbon-oxygen bonds.

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Which bond is least polar?

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Which of the following compound can exhibit cis-trans isomerism?

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Write the correct Lewis dot structure for CCl2O. Which statement correctly describes the structure?

Correct AnswerverifiedD

The ____________ of an element is its ability to pull electrons towards itself when participating in a covalent bond.

Correct Answerverifiedelectronegativity

Which statement about cis and trans isomers is false? The cis- and trans- isomers of a compound:

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From the data below, calculate the approximate enthalpy change for the reaction below.

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Predict qualitatively the relative bond lengths of the four single bonds given below and arrange them from shortest to longest:

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Assume all hydrocarbons given are linear. Which compound will contain no multiple bonds?

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Write the singly bonded Lewis dot structure for BF3. Which statement best describes this structure?

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What is the formal charge on sulfur in SO₂?

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B

Write the correct Lewis dot structure for O₂. Which statement correctly describes the structure of the molecule?

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List these compounds in order of decreasing number of valence electrons: CO₂, CH₃Cl, HCN.

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How many electrons will be in the correctly drawn Lewis Structure for CCl₄?

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Write the correct Lewis dot structure for CCl₂O. Which statement correctly describes the structure?

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D

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electronegativity

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Write the singly bonded Lewis dot structure for BF₃. Which statement best describes this structure?

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