Question 1

Which of the following statements best describes the concept of resonance in Lewis structures?

Accepted Answer

Resonance occurs when two or more valid Lewis structures can be drawn for a molecule, and the true structure is a hybrid of these forms, with electrons delocalized.

Question 2

How many resonance structures can be drawn for the carbonate ion $$\mathrm{CO_3$^{2-}}$$?

Accepted Answer

3

Question 3

Which molecule below exhibits resonance?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 4

What is the total number of valence electrons in the Lewis structure for $$\mathrm{$$CHCl_3$$}$$?

Accepted Answer

26

Question 5

Which of the following best explains why resonance structures are important in chemistry?

Accepted Answer

They indicate that electrons are delocalized, which affects molecular stability and reactivity.

Question 6

Consider the molecule $$\mathrm{O_3$} ($$ozone). Which statement is true about its Lewis structure?

Accepted Answer

It has two resonance structures with different locations for the double bond.

Question 7

Which of the following molecules does NOT have resonance structures?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 8

A student draws the Lewis structure for $$\mathrm{CO_2$} as$$ $$\mathrm{O=C=O}. $$What is the formal charge on each oxygen atom?

Accepted Answer

0

Question 9

Which of the following is the best Lewis structure for $$\mathrm{ClCN}$$?

Accepted Answer

$$:Cl-C\equiv N:$$

Question 10

Which molecule below is most likely to have a central atom with an expanded octet?

Accepted Answer

$$\mathrm{I_3$^-}$$

Question 11

In the Lewis structure for $$\mathrm{CH_2CH_2} ($$ethylene), what type of bond exists between the two carbon atoms?

Accepted Answer

A double bond

Question 12

Which of the following molecules has a bond order greater than 1?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 13

Which statement best describes the difference between the bonds in $$\mathrm{CH_2CH_2}$$ and $$\mathrm{CH_3CH_3}$$?

Accepted Answer

$$\mathrm{CH_2CH_2}$$ has a shorter and stronger bond than $$\mathrm{CH_3CH_3}.$$

Question 14

Which of the following molecules is most likely to have a resonance structure involving a double bond and a single bond that can switch positions?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 15

What is the formal charge on the central carbon atom in the best Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

0

Question 16

Which of the following ions has resonance structures?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 17

A molecule has the formula $$\mathrm{H_2CO}. $$Which of the following best describes the bonding in this molecule?

Accepted Answer

The carbon atom forms a double bond with oxygen and single bonds with each hydrogen.

Question 18

Which of the following molecules or ions is most likely to have a central atom with less than an octet of electrons?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 19

Which of the following is a correct statement about the Lewis structure of $$\mathrm{CO_3$^{2-}}$$?

Accepted Answer

All three C-O bonds are equivalent due to resonance.

Lewis Dot Structures and Resonance: Study Notes for General Chemistry

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