Question 1

Which is the best Lewis structure of CH2FCO2H (connectivity correct as given)?

Accepted Answer

A)    
B)    
C)    
D)    
E)  none of these is acceptable 
A)    
B)    
C)    
D)    
E)  none of these is acceptable D

Question 2

The central atom in SF6 is surrounded by

Accepted Answer

A)  six single bonds and no lone pairs of electrons. 
B)  six single bonds and one lone pair of electrons. 
C)  six single bonds and two lone pairs of electrons. 
D)  five single bonds,one double bond,and one lone pair of electrons. 
E)  four single bonds,two double bonds,and no lone pairs of electrons. 
A)  six single bonds and no lone pairs of electrons. 
B)  six single bonds and one lone pair of electrons. 
C)  six single bonds and two lone pairs of electrons. 
D)  five single bonds,one double bond,and one lone pair of electrons. 
E)  four single bonds,two double bonds,and no lone pairs of electrons. A

Question 3

What is the total number of electrons (both lone and bond pairs)in the Lewis structure of C2O42-?

Accepted Answer

A)  30 
B)  34 
C)  32 
D)  46 
E)  44 
A)  30 
B)  34 
C)  32 
D)  46 
E)  44 B

Question 4

Which of the following exhibits resonance?

Accepted Answer

A)  SCl6 
B)  H2O 
C)  SO2 
D)  NH3 
E)  none 
A)  SCl6 
B)  H2O 
C)  SO2 
D)  NH3 
E)  none

Question 5

Based on electron geometries,which of the following molecules has the smallest bond angle between any two adjacent hydrogen atoms?

Accepted Answer

A)  CH4 
B)  H2O 
C)  BH3 
D)  PH3 
E)  SF6 
A)  CH4 
B)  H2O 
C)  BH3 
D)  PH3 
E)  SF6

Question 6

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 7

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

Accepted Answer

The answer of In PCl5,the Cl-P-Cl bond angle between an...

Question 8

Which of the following is not a valid resonance structure for N3-?

Accepted Answer

A)    
B)    
C)    
D)    
E)  all are correct 
A)    
B)    
C)    
D)    
E)  all are correct

Question 9

What is the correct Lewis structure for IF3?

Accepted Answer

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

Question 10

Three non-equivalent Lewis structures for carbonyl sulfide,SCO,are given below.Use the concepts of formal charge and electronegativity to choose the structure that is the best representation. 
  
$~~~~~~~~$A$~~~~~~~~$$~~~~~~~~$$~~~~~~~~$$~~~~~~~~$$~~~~~~~~$B$~~~~~~~~$$~~~~~~~~$$~~~~~~~~$$~~~~~~~~$C

Accepted Answer

A)  Structure A,because all the formal charges equal 0. 
B)  Structure B,because all the formal charges equal 0. 
C)  Structure C,because all the formal charges equal 0. 
D)  Structure A,because the negative formal charge resides on the most electronegative atom. 
E)  Structure C,because the negative formal charge resides on the most electronegative atom. 
A)  Structure A,because all the formal charges equal 0. 
B)  Structure B,because all the formal charges equal 0. 
C)  Structure C,because all the formal charges equal 0. 
D)  Structure A,because the negative formal charge resides on the most electronegative atom. 
E)  Structure C,because the negative formal charge resides on the most electronegative atom.

Question 11

Using the following data reactions:
 
Calculate the energy of an H-Cl bond.

Accepted Answer

A)  92 kJ/mol 
B)  855 kJ/mol 
C)  487 kJ/mol 
D)  428 kJ/mol 
E)  244 kJ/mol 
A)  92 kJ/mol 
B)  855 kJ/mol 
C)  487 kJ/mol 
D)  428 kJ/mol 
E)  244 kJ/mol

Question 12

How many valence electrons are present in the Lewis formula for the hypochlorite ion,   ?

Accepted Answer

A)  20 
B)  12 
C)  18 
D)  14 
E)  16 
A)  20 
B)  12 
C)  18 
D)  14 
E)  16

Question 13

Which of the following is a correct Lewis structure for oxygen?

Accepted Answer

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

Question 14

Electronegativity is a measure of

Accepted Answer

A)  the ability of a substance to conduct electricity. 
B)  the charge on a polyatomic cation. 
C)  the charge on a polyatomic anion. 
D)  the ability of an atom in a molecule to attract electrons to itself. 
E)  the oxidation number of an atom in a molecule or polyatomic anion. 
A)  the ability of a substance to conduct electricity. 
B)  the charge on a polyatomic cation. 
C)  the charge on a polyatomic anion. 
D)  the ability of an atom in a molecule to attract electrons to itself. 
E)  the oxidation number of an atom in a molecule or polyatomic anion.

Question 15

Which of the following statements is/are CORRECT?
1)Ionic bonds form when one or more valence electrons are transferred from one atom to another.
2)Covalent bonds involve sharing of electrons between atoms.
3)In most covalently bonded compounds,electrons are NOT shared equally between the atoms.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1,2,and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1,2,and 3

Question 16

Which of the following molecules or ions does not have one or more resonance structures?

Accepted Answer

A)  O3 
B)  OCN- 
C)  SO2 
D)  H2CO 
E)  NO3- 
A)  O3 
B)  OCN- 
C)  SO2 
D)  H2CO 
E)  NO3-

Question 17

What is the formal charge of the $\underline{\text{ carbon }}$  atom in the Lewis structure for isocyanate shown below?

Accepted Answer

A)  0 
B)  (-2) 
C)  +1 
D)  (-1) 
E)  -3 
A)  0 
B)  (-2) 
C)  +1 
D)  (-1) 
E)  -3

Question 18

Use VSEPR theory to predict the molecular geometry around the carbon atom in formaldehyde,H2CO.

Accepted Answer

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

Question 19

Which of the following is a correct Lewis structure for H2SO4?

Accepted Answer

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

Question 20

Rank the following covalent bonds in order of decreasing polarity: 
C-H,N-H,O-H,F-H.

Accepted Answer

A)  F-H,O-H,N-H,C-H 
B)  O-H,F-H,N-H,C-H 
C)  N-H,F-H,O-H,C-H 
D)  C-H,N-H,O-H,F-H 
E)  C-H,F-H,O-H,N-H 
A)  F-H,O-H,N-H,C-H 
B)  O-H,F-H,N-H,C-H 
C)  N-H,F-H,O-H,C-H 
D)  C-H,N-H,O-H,F-H 
E)  C-H,F-H,O-H,N-H

Exam 9: Bonding and Molecular Structure

Which is the best Lewis structure of CH2FCO2H (connectivity correct as given)?

The central atom in SF6 is surrounded by

What is the total number of electrons (both lone and bond pairs)in the Lewis structure of C2O42-?

Which of the following exhibits resonance?

Based on electron geometries,which of the following molecules has the smallest bond angle between any two adjacent hydrogen atoms?

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.

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

Which of the following is not a valid resonance structure for N3-?

What is the correct Lewis structure for IF3?

Three non-equivalent Lewis structures for carbonyl sulfide,SCO,are given below.Use the concepts of formal charge and electronegativity to choose the structure that is the best representation. ~~~~~~~~ A ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ B ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ ~~~~~~~~ C

Using the following data reactions: Calculate the energy of an H-Cl bond.

How many valence electrons are present in the Lewis formula for the hypochlorite ion, ?

Which of the following is a correct Lewis structure for oxygen?

Electronegativity is a measure of

Which of the following statements is/are CORRECT? 1)Ionic bonds form when one or more valence electrons are transferred from one atom to another. 2)Covalent bonds involve sharing of electrons between atoms. 3)In most covalently bonded compounds,electrons are NOT shared equally between the atoms.

Which of the following molecules or ions does not have one or more resonance structures?

What is the formal charge of the carbon ‾\underline{\text{ carbon }} carbon ​ atom in the Lewis structure for isocyanate shown below?

Use VSEPR theory to predict the molecular geometry around the carbon atom in formaldehyde,H2CO.

Which of the following is a correct Lewis structure for H2SO4?

Rank the following covalent bonds in order of decreasing polarity: C-H,N-H,O-H,F-H.

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

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Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

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Principles of Reactivity: Chemical Equilibria

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Filters

Which is the best Lewis structure of CH₂FCO₂H (connectivity correct as given)?

The central atom in SF₆ is surrounded by

What is the total number of electrons (both lone and bond pairs)in the Lewis structure of C₂O₄2-?

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.

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

Which of the following is not a valid resonance structure for N₃^-?

What is the correct Lewis structure for IF₃?

Three non-equivalent Lewis structures for carbonyl sulfide,SCO,are given below.Use the concepts of formal charge and electronegativity to choose the structure that is the best representation. $$ A $$ $$ $$ $$ $$ B $$ $$ $$ $$ C

What is the formal charge of the $\underline{\text{ carbon }}$ atom in the Lewis structure for isocyanate shown below? $What is the formal charge of the \underline{\text{ carbon }} atom in the Lewis structure for isocyanate shown below?$

Use VSEPR theory to predict the molecular geometry around the carbon atom in formaldehyde,H₂CO.

Which of the following is a correct Lewis structure for H₂SO₄?