Question 1

Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90° bond angle in it. (In each case except water, the central atom is the first one in the formula.)

Accepted Answer

A)  AlCl 4 −
B)  NH 3
C)  PCl 5
D)  CO 2
E)  H 2OF) A) and B)
G) All of the above

Question 2

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) C) and D)
G) A) and D)

Question 3

Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

Accepted Answer

A)  90°
B)  109°
C)  120°
D)  180°
E)  between 120 and 180°F) C) and D)
G) B) and D)

Question 4

What is the molecular shape of ClCN as predicted by the VSEPR theory? (Carbon is the central atom.)

Accepted Answer

A)  Linear
B)  Bent
C)  Angular
D)  Trigonal
E)  None of these choices are correct.F) C) and D)
G) B) and D)

Question 5

What is the molecular shape of BCl3 as predicted by the VSEPR theory?

Accepted Answer

A)  Linear
B)  Trigonal planar
C)  Bent
D)  Tetrahedral
E)  Trigonal pyramidalF) A) and B)
G) All of the above

Question 6

How many electron pairs are shared between the carbon atoms in C2H4?

Accepted Answer

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

Question 7

What is the molecular shape of NO2− as predicted by the VSEPR theory?

Accepted Answer

A)  Linear
B)  Trigonal planar
C)  Bent
D)  Tetrahedral
E)  ResonantF) B) and E)
G) A) and D)

Question 8

Which one of the following molecules and ions will have a planar geometry?

Accepted Answer

A)  PCl 3
B)  BF 4 −
C)  XeF 4
D)  BrF 5
E)  H 3O +F) A) and B)
G) A) and C)

Question 9

According to VSEPR theory, a molecule with the general formula AX4E2 will have a __________ molecular shape.

Accepted Answer

A)  tetrahedral
B)  square pyramidal
C)  square planar
D)  octahedral
E)  see-sawF) B) and D)
G) A) and E)

Question 10

Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

Accepted Answer

A)  BrF 3
B)  H 3O +
C)  PCl 3
D)  SO 4 2−
E)  SF 4F) A) and C)
G) C) and D)

Question 11

Predict the ideal bond angles around carbon in C2I2 using the molecular shape given by the VSEPR theory.

Accepted Answer

A)  90°
B)  109°
C)  120°
D)  180°
E)  None of these choices are correct.F) None of the above
G) A) and C)

Question 12

What is the molecular shape of SCl3F as predicted by the VSEPR theory?

Accepted Answer

A)  Linear
B)  Bent
C)  See-saw
D)  T-shaped
E)  Trigonal pyramidalF) A) and E)
G) B) and D)

Question 13

In which of the following does the nitrogen atom have a formal charge of −1?

Accepted Answer

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

Question 14

In a Lewis structure for a molecule or ion, the sum of the formal charges on the atoms is equal to the charge on the molecule or ion.

Accepted Answer

A) True 
 B)False

Question 15

Select the best Lewis structure for ClCN.

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) A) and B)
G) C) and D)

Question 16

According to VSEPR theory, a molecule with the general formula AX6 will have a __________ molecular shape.

Accepted Answer

A)  tetrahedral
B)  trigonal planar
C)  trigonal bipyramidal
D)  hexagonal
E)  octahedralF) All of the above
G) A) and B)

Question 17

What is the molecular shape of BeH2 as predicted by the VSEPR theory?

Accepted Answer

A)  Linear
B)  Bent
C)  Angular
D)  Trigonal
E)  None of these choices are correct.F) B) and C)
G) A) and B)

Question 18

What is the molecular shape of the thiocyanate anion, SCN−, as predicted by the VSEPR theory? (Carbon is the central atom.)

Accepted Answer

A)  Linear
B)  Bent
C)  Angular
D)  Trigonal
E)  None of these choices are correct.F) C) and D)
G) A) and B)

Question 19

According to VSEPR theory, a molecule with the general formula AX2E will have a __________ molecular shape.

Accepted Answer

A)  bent
B)  see-saw
C)  trigonal planar
D)  T-shaped
E)  trigonal pyramidalF) A) and E)
G) C) and E)

Question 20

Predict the actual bond angles in SF3+ using the VSEPR theory.

Accepted Answer

A)  more than 120°
B)  exactly 120°
C)  between 109° and 120°
D)  between 90° and 109°
E)  less than 90°F) C) and D)
G) None of the above

Exam 10: The Shapes of Molecules

In a Lewis structure for a molecule or ion, the sum of the formal charges on the atoms is equal to the charge on the molecule or ion.

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Select the best Lewis structure for ClCN.

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According to VSEPR theory, a molecule with the general formula AX4E2 will have a __________ molecular shape.

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What is the molecular shape of BCl3 as predicted by the VSEPR theory?

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According to VSEPR theory, a molecule with the general formula AX6 will have a __________ molecular shape.

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What is the molecular shape of NO2− as predicted by the VSEPR theory?

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How many electron pairs are shared between the carbon atoms in C2H4?

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According to VSEPR theory, a molecule with the general formula AX2E will have a __________ molecular shape.

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Predict the ideal bond angles around carbon in C2I2 using the molecular shape given by the VSEPR theory.

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Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

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In which of the following does the nitrogen atom have a formal charge of −1?

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Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

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What is the molecular shape of ClCN as predicted by the VSEPR theory? (Carbon is the central atom.)

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Which one of the following molecules and ions will have a planar geometry?

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What is the molecular shape of the thiocyanate anion, SCN−, as predicted by the VSEPR theory? (Carbon is the central atom.)

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What is the molecular shape of BeH2 as predicted by the VSEPR theory?

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Which one of the following Lewis structures is definitely incorrect?

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Predict the actual bond angles in SF3+ using the VSEPR theory.

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What is the molecular shape of SCl3F as predicted by the VSEPR theory?

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Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90° bond angle in it. (In each case except water, the central atom is the first one in the formula.)

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According to VSEPR theory, a molecule with the general formula AX₄E₂will have a __________ molecular shape.

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What is the molecular shape of BCl₃as predicted by the VSEPR theory?

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According to VSEPR theory, a molecule with the general formula AX₆ will have a __________ molecular shape.

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What is the molecular shape of NO₂⁻ as predicted by the VSEPR theory?

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How many electron pairs are shared between the carbon atoms in C₂H₄?

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According to VSEPR theory, a molecule with the general formula AX₂E will have a __________ molecular shape.

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Predict the ideal bond angles around carbon in C₂I₂using the molecular shape given by the VSEPR theory.

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Predict the ideal bond angles around nitrogen in N₂F₂using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

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What is the molecular shape of the thiocyanate anion, SCN⁻, as predicted by the VSEPR theory? (Carbon is the central atom.)

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What is the molecular shape of BeH₂as predicted by the VSEPR theory?

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Predict the actual bond angles in SF₃⁺ using the VSEPR theory.

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What is the molecular shape of SCl₃F as predicted by the VSEPR theory?

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