Question 1

Which element from Group 5A has the following Lewis symbol: $$\cdot\cdot\cdot\cdot\cdot\cdot\cdot\cdot	ext{N}$$ ?

Accepted Answer

Nitrogen

Question 2

What is the correct formula for the stable binary compound formed when nitrogen reacts with fluorine, based on their Lewis symbols?

Accepted Answer

$$	ext{NF}_3$$

Question 3

Which molecule has the same number of shared electron pairs as unshared electron pairs?

Accepted Answer

$$	ext{H}_2	ext{S}$$

Question 4

Which of the following bonds is most polar based on electronegativity differences: $$	ext{S-Cl}$$, $$	ext{S-Br}$$, $$	ext{Se-Cl}$$, or $$	ext{Se-Br}$$?

Accepted Answer

$$	ext{Se-Cl}$$

Question 5

Which molecule below is nonpolar and has a dipole moment $$\mu = 0$$?

Accepted Answer

$$	ext{CO}_2$$

Question 6

What is the bond type for a bond with an electronegativity difference of $$2.5$$?

Accepted Answer

Ionic

Question 7

How many valence electrons should appear in the Lewis structure for $$	ext{CH}_2	ext{Cl}_2 ($$dichloromethane)?

Accepted Answer

$$20$$

Question 8

Which atom is usually the central atom in a Lewis structure for a neutral molecule?

Accepted Answer

The least electronegative atom (except hydrogen)

Question 9

In the Lewis structure for $$	ext{HCN}$$, what type of bond exists between carbon and nitrogen?

Accepted Answer

Triple bond

Question 10

When drawing the Lewis structure for the carbonate ion $$	ext{CO}_3$$^{2-}$$, how many resonance structures can be drawn?

Accepted Answer

3

Question 11

Which of the following best describes the bond character in $$	ext{CO}_3$$^{2-}$$?

Accepted Answer

Each bond is a blend of single and double bond character due to resonance

Question 12

Which molecule is predicted to have the shorter sulfur–oxygen bonds: $$	ext{SO}_3 or$$ $$	ext{SO}_3$$^{2-}$$?

Accepted Answer

$$	ext{SO}_3$$

Question 13

What is the correct Lewis structure for the $$	ext{BrO}_3^-$$ ion?

Accepted Answer

Br with three single bonds to O, each O with six nonbonded electrons, and two nonbonded electrons on Br, all within brackets with a negative charge

Question 14

Which of the following molecules is an example of a perfect resonance structure?

Accepted Answer

$$	ext{CO}_3$$^{2-}$$

Question 15

Which element has the highest electronegativity according to the periodic table?

Accepted Answer

Fluorine

Question 16

Which molecule below is classified as ionic based on the difference in electronegativity?

Accepted Answer

$$	ext{LiF}$$

Question 17

What is the dipole moment ($$\mu) $$for a molecule with perfectly symmetric structure, such as $$	ext{CCl}_4$$?

Accepted Answer

$$\mu = 0$$

Question 18

Which of the following is NOT a step in drawing a Lewis structure for a polyatomic ion?

Accepted Answer

Place hydrogen as the central atom

Question 19

Which molecule below would have a bond with the greatest percent ionic character?

Accepted Answer

$$	ext{LiF}$$

Question 20

Which of the following statements about hydrogen in Lewis structures is correct?

Accepted Answer

Hydrogen always has a maximum of two electrons

scratch

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