Question 1

Draw Lewis structures, showing all valence electrons, for:
a. N
b. Br-
c. O2
d. SO42-

Accepted Answer

A)11ec6d40_88db_23e6_9cd1_6949936dcf2d_T...

Question 2

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 the above

Question 3

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl2.

Accepted Answer

A)   2. 
A)     
B)     
C)     
D)     
E)   None of the above structures is suitable for SOCl2." class="answers-bank-image d-inline" rel="preload" >
B)   2. 
A)     
B)     
C)     
D)     
E)   None of the above structures is suitable for SOCl2." class="answers-bank-image d-inline" rel="preload" >
C)   2. 
A)     
B)     
C)     
D)     
E)   None of the above structures is suitable for SOCl2." class="answers-bank-image d-inline" rel="preload" >
D)   2. 
A)     
B)     
C)     
D)     
E)   None of the above structures is suitable for SOCl2." class="answers-bank-image d-inline" rel="preload" >
E)   None of the above structures is suitable for SOCl2.

Question 4

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)   AlCl4-
B)   NH3
C)   PCl5
D)   CO2
E)   H2O

Question 5

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 the above

Question 6

In order for a non-cyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

Accepted Answer

A) True 
 B)False

Question 7

List the three important ways in which molecules can violate the octet rule, and in each case draw one Lewis structure of your choice as an example.

Accepted Answer

Electron-deficient molecules have fewer ...

Question 8

In which one of the following structures does the central atom have a formal charge of +2?

Accepted Answer

A)   SF6 6   
B)   SO42-   
C)   O3   
D)   BeCl2   
E)   AlCl4-  " class="answers-bank-image d-inline" rel="preload" >
B)   SO42- 6   
B)   SO42-   
C)   O3   
D)   BeCl2   
E)   AlCl4-  " class="answers-bank-image d-inline" rel="preload" >
C)   O3 6   
B)   SO42-   
C)   O3   
D)   BeCl2   
E)   AlCl4-  " class="answers-bank-image d-inline" rel="preload" >
D)   BeCl2 6   
B)   SO42-   
C)   O3   
D)   BeCl2   
E)   AlCl4-  " class="answers-bank-image d-inline" rel="preload" >
E)   AlCl4- 6   
B)   SO42-   
C)   O3   
D)   BeCl2   
E)   AlCl4-  " class="answers-bank-image d-inline" rel="preload" >

Question 9

The formal charges on Cl and O in the structure shown for the ClO- ion are, respectively - ion are, respectively   A)  0 and -1 B)  -1 and 0 C)  1 and -2 D)  -2 and 1 E)  none of the above" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0 and -1
B)   -1 and 0
C)   1 and -2
D)   -2 and 1
E)   none of the above

Question 10

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

Accepted Answer

A)   linear
B)   trigonal planar
C)   bent
D)   tetrahedral
E)   trigonal pyramidal

Question 11

Select the best Lewis structure for ClCN.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 12

In which one of the following is the best Lewis structure a resonance structure? (central atoms are bold)

Accepted Answer

A)   CO2
B)   ClO3-
C)   COCl2
D)   NO2+
E)   HCN

Question 13

In formaldehyde, CH2O, both the formal charge and the oxidation number of carbon are zero.

Accepted Answer

A) True 
 B)False

Question 14

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 the above

Question 15

According to VSEPR theory, a molecule with the general formula AX3E2 will have a _____ molecular shape.

Accepted Answer

A)   trigonal pyramidal
B)   trigonal bipyramidal
C)   trigonal planar
D)   T-shaped
E)   see-saw

Question 16

Bond angles of 180° only occur around atoms which display linear molecular geometry.

Accepted Answer

A) True 
 B)False

Question 17

According to VSEPR theory, a molecule with the general formula AX2E2 will have a _____ molecular shape.

Accepted Answer

A)   linear
B)   bent
C)   trigonal planar
D)   tetrahedral
E)   see-saw

Question 18

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   E

Question 19

In which one of the following species is the central atom (the first atom in the formula)  an exception to the octet rule?

Accepted Answer

A)   NH3
B)   NH4+
C)   I2
D)   BH4-
E)   SF6

Question 20

According to VSEPR theory, a molecule with the general formula AX5 will have a ______ molecular shape.

Accepted Answer

A)   tetrahedral
B)   trigonal planar
C)   trigonal pyramidal
D)   trigonal bipyramidal
E)   see-saw

Exam 10: The Shapes of Molecules

Which one of the following Lewis structures is definitely incorrect?

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Select the best Lewis structure for ClCN.

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In formaldehyde, CH2O, both the formal charge and the oxidation number of carbon are zero.

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In which one of the following structures does the central atom have a formal charge of +2?

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

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What is the molecular shape of NOCl 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.)

Correct AnswerverifiedShow Answer

In which one of the following is the best Lewis structure a resonance structure? (central atoms are bold)

Correct AnswerverifiedShow Answer

In order for a non-cyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

Correct AnswerverifiedShow Answer

The formal charges on Cl and O in the structure shown for the ClO- ion are, respectively

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Draw Lewis structures, showing all valence electrons, for: a. N b. Br- c. O2 d. SO42-

Correct AnswerverifiedA)11ec6d40_88db_23e6_9cd1_6949936dcf2d_T...View AnswerShow Answer

Bond angles of 180° only occur around atoms which display linear molecular geometry.

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In which one of the following species is the central atom (the first atom in the formula) an exception to the octet rule?

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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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According to VSEPR theory, a molecule with the general formula AX5 will have a ______ molecular shape.

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List the three important ways in which molecules can violate the octet rule, and in each case draw one Lewis structure of your choice as an example.

Correct AnswerverifiedElectron-deficient molecules have fewer ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl2.

Correct AnswerverifiedShow Answer

According to VSEPR theory, a molecule with the general formula AX2E2 will have a _____ molecular shape.

Correct AnswerverifiedShow Answer

According to VSEPR theory, a molecule with the general formula AX3E2 will have a _____ molecular shape.

Correct AnswerverifiedShow Answer

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In formaldehyde, CH₂O, both the formal charge and the oxidation number of carbon are zero.

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

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The formal charges on Cl and O in the structure shown for the ClO^-ion are, respectively

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Draw Lewis structures, showing all valence electrons, for: a. N b. Br^- c. O₂ d. SO₄^2-

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A)11ec6d40_88db_23e6_9cd1_6949936dcf2d_T...
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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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According to VSEPR theory, a molecule with the general formula AX₅ will have a ______ molecular shape.

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Electron-deficient molecules have fewer ...
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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.)

Correct Answer
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Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl₂.

Correct Answer
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According to VSEPR theory, a molecule with the general formula AX₂E₂will have a _____ molecular shape.

Correct Answer
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According to VSEPR theory, a molecule with the general formula AX₃E₂will have a _____ molecular shape.

Correct Answer
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