Question 1

Which of the following molecules contains a central atom that does NOT obey the octet rule?

Accepted Answer

XeF$$_4$$

Question 2

Which of the following statements about bond length is correct for a given set of atoms?

Accepted Answer

A triple bond is shorter than a double bond, which is shorter than a single bond.

Question 3

Which of the following bonds is the most polar?

Accepted Answer

KF

Question 4

What is the formal charge on the central atom in the Lewis structure of CO$$_2$$?

Accepted Answer

0

Question 5

Which of the following molecules exhibits resonance?

Accepted Answer

O$$_3$$

Question 6

Which element is the most electronegative?

Accepted Answer

Fluorine

Question 7

Which of the following best describes the bond in HCl?

Accepted Answer

Polar covalent

Question 8

A molecule of boron trifluoride (BF$$_3) is $$known to have an incomplete octet. What is the total number of valence electrons around the boron atom in BF$$_3$$?

Accepted Answer

6

Question 9

Which of the following is the correct order of bond polarity from least to most polar?

Accepted Answer

H–H \u003c C–H \u003c C–F \u003c KF

Question 10

Which of the following is a correct statement about resonance structures?

Accepted Answer

The actual structure is a hybrid of all resonance forms.

Question 11

Which of the following molecules contains a central atom with an expanded octet?

Accepted Answer

PCl$$_5$$

Question 12

What is the formal charge on the nitrogen atom in the Lewis structure of HCN (hydrogen cyanide)?

Accepted Answer

0

Question 13

Which of the following best explains why the O–H bond in water is polar?

Accepted Answer

Oxygen is more electronegative than hydrogen, so the shared electrons are closer to oxygen.

Question 14

Which of the following molecules is expected to have the shortest bond length?

Accepted Answer

N$$_2$$

Question 15

Which of the following is a correct application of the octet rule?

Accepted Answer

Carbon in CH$$_4$$ forms four single bonds to achieve eight valence electrons.

Question 16

Which of the following ions has a Lewis structure in which the central atom has more than eight electrons?

Accepted Answer

BrF$$_4^-$$

Question 17

In the Lewis structure of ozone (O$$_3$$), what is the formal charge on the central oxygen atom in the most stable resonance structure?

Accepted Answer

+1

Question 18

Which of the following best describes the bonding in NaCl?

Accepted Answer

Ionic

Question 19

Which of the following is a correct statement about formal charge?

Accepted Answer

The most plausible Lewis structure is the one with the smallest formal charges and negative charges on the most electronegative atoms.

Question 20

Which of the following molecules is most likely to have a non-polar covalent bond?

Accepted Answer

Cl$$_2$$

Chapter 6: Representing Molecules – Lewis Structures, Bonding, and Polarity

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