Question 1

What is the O−C−N bond angle in OCN-?

Accepted Answer

A)   90°
B)   107°
C)   109.5°
D)   120°
E)   180°F) A) and B)
G) D) and E)

Question 2

Which of the following is the approximate O−S−O bond angle in the sulfite ion,SO32-?

Accepted Answer

A)   90°
B)   109.5°
C)   120°
D)   180°
E)   150°F) A) and B)
G) C) and E)

Question 3

What is the molecular geometry around carbon atom C1? 1?   A)  tetrahedral B)  trigonal planar C)  linear D)  trigonal pyramidal E)  bent" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   tetrahedral
B)   trigonal planar
C)   linear
D)   trigonal pyramidal
E)   bentF) A) and B)
G) A) and C)

Question 4

What are the approximate F−Br−F bond angles in BrF5?

Accepted Answer

A)   90° and 180°
B)   109.5°
C)   90° and 120°
D)   120°
E)   180°F) B) and D)
G) C) and D)

Question 5

What is the electron-pair geometry around an atom in a molecule or ion which is surrounded by two lone pairs of electrons and three single bonds.

Accepted Answer

A)   trigonal bipyramidal
B)   see-saw or distorted tetrahedron
C)   T-shaped
D)   linear
E)   trigonal planarF) C) and D)
G) B) and D)

Question 6

The nitrogen atom in the cyanide ion,CN-,is surrounded by:

Accepted Answer

A)   one single bond and three lone pairs of electrons.
B)   one double bond and one lone pair of electrons.
C)   one double bond and two lone pairs of electrons.
D)   one triple bond and one lone pair of electrons.
E)   one triple bond and no lone pairs of electrons.F) A) and B)
G) A) and C)

Question 7

Which combination of atoms is most likely to produce a compound with ionic bonds?

Accepted Answer

A)   B and C
B)   S and O
C)   N and F
D)   Si and Cl
E)   Mg and OF) A) and B)
G) C) and D)

Question 8

In benzene,C6H6,the six carbon atoms are arranged in a ring.Two equivalent Lewis structures can be drawn for benzene.In both structures,the carbon atoms have a trigonal planar geometry.These two equivalent structures are referred to as ________ structures.

Accepted Answer

Question 9

The molecular geometry of a molecule whose central atom has four single bonds and one lone pair of electrons is ________.

Accepted Answer

trigonal-b...

Question 10

Which of the following elements is most likely to form a molecular structure that disobeys the octet rule?

Accepted Answer

A)   B
B)   C
C)   N
D)   O
E)   FF) C) and D)
G) B) and C)

Question 11

Which of the following exhibits resonance?

Accepted Answer

A)   SCl4
B)   H2O
C)   SO2
D)   BH3
E)   noneF) B) and E)
G) A) and E)

Question 12

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of boron tribromide,BBr3.

Accepted Answer

A)   The electron-pair geometry is trigonal-pyramidal,the molecular geometry is trigonal-pyramidal.
B)   The electron-pair geometry is trigonal-planar,the molecular geometry is trigonal-planar.
C)   The electron-pair geometry is trigonal-planar,the molecular geometry is bent.
D)   The electron-pair geometry is tetrahedral,the molecular geometry is trigonal-pyramidal.
E)   The electron-pair geometry is trigonal-pyramidal,the molecular geometry is t-shaped.F) B) and C)
G) A) and E)

Question 13

Three possible structures of C2H2Cl2 are shown below.Which of these molecules are polar? 2H2Cl2 are shown below.Which of these molecules are polar?   A)  1 only B)  2 only C)  3 only D)  1 and 3 E)  2 and 3" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1 only
B)   2 only
C)   3 only
D)   1 and 3
E)   2 and 3F) C) and D)
G) A) and B)

Question 14

What is the formal charge on the carbon atom in CO?

Accepted Answer

A)   +2
B)   +1
C)   0
D)   -1
E)   -2F) All of the above
G) B) and D)

Question 15

Which of the following molecules is polar?

Accepted Answer

A)   CS2
B)   SO2
C)   XeF2
D)   XeF4
E)   SO3F) C) and E)
G) A) and B)

Question 16

Which of the following Lewis structures for nitrogen oxides is incorrect? 2O. B)  N2O4. C)  N2O3. D)  N2O5. E)  All of these are incorrect structures." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   N2O.
B)   N2O4.
C)   N2O3.
D)   N2O5.
E)   All of these are incorrect structures.F) B) and C)
G) C) and D)

Question 17

In PCl5,the Cl−P−Cl bond angle between an axial and an equatorial chlorine atom is ________ degrees.

Accepted Answer

Question 18

Which of the following species has a Lewis structure similar to iodine tetrafluoride,IF4-?

Accepted Answer

A)   XeF4
B)   SO42-
C)   PF4+
D)   SF4
E)   IO4-F) A) and B)
G) None of the above

Question 19

The molecule H2S has

Accepted Answer

A)   2 bonding pairs and 3 lone pairs
B)   2 bonding pairs and 2 lone pairs
C)   3 bonding pairs and 1 lone pair
D)   3 bonding pairs and 3 lone pairs
E)   none of theseF) C) and D)
G) A) and E)

Question 20

What is the total number of electrons (both lone and bond pairs) in the Lewis structure of SO42-?

Accepted Answer

A)   18
B)   20
C)   32
D)   24
E)   22F) A) and B)
G) All of the above

Exam 9: Bonding and Molecular Structure

The molecule H2S has

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Which of the following exhibits resonance?

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What is the molecular geometry around carbon atom C1?

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What is the electron-pair geometry around an atom in a molecule or ion which is surrounded by two lone pairs of electrons and three single bonds.

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Which of the following elements is most likely to form a molecular structure that disobeys the octet rule?

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What is the total number of electrons (both lone and bond pairs) in the Lewis structure of SO42-?

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Which of the following species has a Lewis structure similar to iodine tetrafluoride,IF4-?

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Which combination of atoms is most likely to produce a compound with ionic bonds?

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The molecular geometry of a molecule whose central atom has four single bonds and one lone pair of electrons is ________.

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Which of the following Lewis structures for nitrogen oxides is incorrect?

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The nitrogen atom in the cyanide ion,CN-,is surrounded by:

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What is the O−C−N bond angle in OCN-?

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In PCl5,the Cl−P−Cl bond angle between an axial and an equatorial chlorine atom is ________ degrees.

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Which of the following molecules is polar?

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What are the approximate F−Br−F bond angles in BrF5?

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In benzene,C6H6,the six carbon atoms are arranged in a ring.Two equivalent Lewis structures can be drawn for benzene.In both structures,the carbon atoms have a trigonal planar geometry.These two equivalent structures are referred to as ________ structures.

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What is the formal charge on the carbon atom in CO?

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Which of the following is the approximate O−S−O bond angle in the sulfite ion,SO32-?

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Three possible structures of C2H2Cl2 are shown below.Which of these molecules are polar?

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Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of boron tribromide,BBr3.

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The molecule H₂S has

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What is the molecular geometry around carbon atom C₁?

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What is the total number of electrons (both lone and bond pairs) in the Lewis structure of SO₄2-?

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Which of the following species has a Lewis structure similar to iodine tetrafluoride,IF₄^-?

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trigonal-b...
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The nitrogen atom in the cyanide ion,CN^-,is surrounded by:

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What is the O−C−N bond angle in OCN^-?

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In PCl₅,the Cl−P−Cl bond angle between an axial and an equatorial chlorine atom is ________ degrees.

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What are the approximate F−Br−F bond angles in BrF₅?

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In benzene,C₆H₆,the six carbon atoms are arranged in a ring.Two equivalent Lewis structures can be drawn for benzene.In both structures,the carbon atoms have a trigonal planar geometry.These two equivalent structures are referred to as ________ structures.

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Which of the following is the approximate O−S−O bond angle in the sulfite ion,SO₃^2-?

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Three possible structures of C₂H₂Cl₂ are shown below.Which of these molecules are polar?

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Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of boron tribromide,BBr₃.

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