Question 1

The Lewis structure of trimethylamine is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

Accepted Answer

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Question 2

Nitroamines are common functional groups found in energetic materials, such as RDX and HMX. For the structure below, draw two other significant resonance structures, include any formal charges, and indicate the hybridization on each nitrogen and oxygen.

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Question 3

Which of the following compounds are covalent compounds? A) KCl B) CF₄ C) NH₃ D) both A and B E) both B and C

Accepted Answer

Covalent compounds are formed by sharing electrons between atoms, while ionic compounds are formed by transferring electrons from one atom to another. KCl is an ionic compound because potassium (K) donates an electron to chlorine (Cl). CF₄ and NH₃ are both covalent compounds because they are made up of nonmetals that share electrons to achieve a full outer shell.

Question 4

When a negatively charged species is most appropriately depicted as a hybrid of several resonance forms, the negative charge present is considered to be rapidly moving between the resonance forms bearing the formal negative charge.

Accepted Answer

The negative charge is not actually moving between the resonance forms; rather, resonance forms are a way to depict the delocalization of the charge across the molecule, indicating that the actual electronic structure is a hybrid of all the resonance forms.

Question 5

Structures ________, shown below, are resonance structures, and structure ________ is the major contributor to the overall resonance hybrid. 
A) 2 & 4; 2
B) 1, 3 & 5; 3
C) 4 & 6; 6
D) 1, 3 & 5; 1
E) 1, 3, 4 & 5; 3

Accepted Answer

Structures 1, 3 and 5 are resonance structures because they have the same arrangement of atoms and only differ in the placement of the double bonds. Structure 3 is the major contributor to the resonance hybrid because it has the greatest number of covalent bonds and formal charges closest to zero.

Question 6

Draw the important resonance forms for the structure shown below.

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Question 7

In the compound sodium methoxide (NaOCH₃), there is ________ bonding. A) ionic B) polar covalent C) nonpolar covalent D) a mixture of ionic and covalent E) resonance stabilized

Accepted Answer

Sodium methoxide consists of an ionic bond between sodium (Na) and the methoxide ion (OCH₃⁻), and within the methoxide ion, there are polar covalent bonds between oxygen and carbon, and carbon and hydrogen.

Question 8

Draw the complete Lewis structure for the compound whose condensed formula is (CH₃)₂CHCHO.

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Question 9

One resonance structure of a cation is shown. Provide the other reasonable resonance structures.

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Question 10

Draw the other important resonance form of:

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Question 11

Draw a line-angle formula for (CH₃)₂CHCH₂CH₂NH₂.

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Question 12

Which of the following structures (a-d) is another resonance structure of the following organic molecule?  
A) 
B) 
C) 
D)

Accepted Answer

The only difference between the given structure and option B is the location of a double bond. This relocation of the double bond results in a change of electron distribution and delocalization, making it a resonance structure. Option A and D have different overall structures and option C does not have any changes in double bond positions.

Question 13

When a molecule can best be represented as a series of resonance forms, each of these forms always contributes to the same degree in the hybrid.

Accepted Answer

The contribution of each resonance form to the hybrid depends on its stability; more stable resonance forms contribute more to the hybrid structure than less stable ones.

Question 14

The Lewis structure of pentane is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

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Question 15

Draw 3 significant resonance structures for the compound shown below. Place a box around the major contributor. Fill in any missing formal charges.

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Question 16

Draw additional resonance contributors for:

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Question 17

Which of the following bonding patterns of carbon is not allowed in the formation of an organic compound? 
A)
B) 
C) 
D) 
E) 
F)

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Question 18

Draw the important resonance forms for the structure shown below.

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Question 19

Which of the following choices represent(s) a pair of resonance forms?
A) 
B) 
C) 
D) both A and C
E) both B and C

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Question 20

Draw the important resonance forms of the structure below to indicate the delocalization of charge. Indicate which is the major contributor to the overall structure.

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Quiz 1: Structure and Bonding

The Lewis structure of trimethylamine is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

Nitroamines are common functional groups found in energetic materials, such as RDX and HMX. For the structure below, draw two other significant resonance structures, include any formal charges, and indicate the hybridization on each nitrogen and oxygen.

Which of the following compounds are covalent compounds?

When a negatively charged species is most appropriately depicted as a hybrid of several resonance forms, the negative charge present is considered to be rapidly moving between the resonance forms bearing the formal negative charge.

Structures , shown below, are resonance structures, and structure is the major contributor to the overall resonance hybrid.

Draw the important resonance forms for the structure shown below.

In the compound sodium methoxide (NaOCH₃) , there is ________ bonding.

Draw the complete Lewis structure for the compound whose condensed formula is (CH₃)₂CHCHO.

One resonance structure of a cation is shown. Provide the other reasonable resonance structures.

Draw the other important resonance form of:

Draw a line-angle formula for (CH₃)₂CHCH₂CH₂NH₂.

Which of the following structures (a-d) is another resonance structure of the following organic molecule?

When a molecule can best be represented as a series of resonance forms, each of these forms always contributes to the same degree in the hybrid.

The Lewis structure of pentane is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

Draw 3 significant resonance structures for the compound shown below. Place a box around the major contributor. Fill in any missing formal charges.

Draw additional resonance contributors for:

Which of the following bonding patterns of carbon is not allowed in the formation of an organic compound?

Draw the important resonance forms for the structure shown below.

Which of the following choices represent(s) a pair of resonance forms?

Draw the important resonance forms of the structure below to indicate the delocalization of charge. Indicate which is the major contributor to the overall structure.

Quiz 1: Structure and Bonding

The Lewis structure of trimethylamine is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

Nitroamines are common functional groups found in energetic materials, such as RDX and HMX. For the structure below, draw two other significant resonance structures, include any formal charges, and indicate the hybridization on each nitrogen and oxygen.

Which of the following compounds are covalent compounds?

When a negatively charged species is most appropriately depicted as a hybrid of several resonance forms, the negative charge present is considered to be rapidly moving between the resonance forms bearing the formal negative charge.

Structures ________, shown below, are resonance structures, and structure ________ is the major contributor to the overall resonance hybrid.

Draw the important resonance forms for the structure shown below.

In the compound sodium methoxide (NaOCH3) , there is ________ bonding.

Draw the complete Lewis structure for the compound whose condensed formula is (CH3)2CHCHO.

One resonance structure of a cation is shown. Provide the other reasonable resonance structures.

Draw the other important resonance form of:

Draw a line-angle formula for (CH3)2CHCH2CH2NH2.

Which of the following structures (a-d) is another resonance structure of the following organic molecule?

When a molecule can best be represented as a series of resonance forms, each of these forms always contributes to the same degree in the hybrid.

The Lewis structure of pentane is shown below. Draw the condensed structural formula which corresponds to this Lewis structure.

Draw 3 significant resonance structures for the compound shown below. Place a box around the major contributor. Fill in any missing formal charges.

Draw additional resonance contributors for:

Which of the following bonding patterns of carbon is not allowed in the formation of an organic compound?

Draw the important resonance forms for the structure shown below.

Which of the following choices represent(s) a pair of resonance forms?

Draw the important resonance forms of the structure below to indicate the delocalization of charge. Indicate which is the major contributor to the overall structure.

Structures , shown below, are resonance structures, and structure is the major contributor to the overall resonance hybrid.

In the compound sodium methoxide (NaOCH₃) , there is ________ bonding.

Draw the complete Lewis structure for the compound whose condensed formula is (CH₃)₂CHCHO.

Draw a line-angle formula for (CH₃)₂CHCH₂CH₂NH₂.