Question 1

Which of the following best describes the type of bonding in sodium chloride (NaCl) as shown in the third image?

Accepted Answer

Ionic bonding, where electrons are transferred from Na to Cl.

Question 2

Refer to the second image. What is the molecular geometry and bond angle for a molecule with six regions of electron density around the central atom?

Accepted Answer

Octahedral, $$90^\circ$$

Question 3

Which of the following statements about the octet rule is correct?

Accepted Answer

Main group atoms tend to gain, lose, or share electrons to achieve a noble gas configuration.

Question 4

Given the Lewis dot structure for ammonia (NH$$_3$$), how many lone pairs are present on the central atom?

Accepted Answer

One

Question 5

Which molecule below is an example of a molecule with a coordinate (dative) covalent bond?

Accepted Answer

BF$$_3$$·NH$$_3$$

Question 6

A molecule has the formula AX$$_2E$_2. $$According to VSEPR theory, what is its molecular geometry?

Accepted Answer

Bent (angular)

Question 7

Which of the following best explains why ionic compounds like NaCl have high melting points?

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions.

Question 8

Which of the following molecules is nonpolar, even though it contains polar bonds?

Accepted Answer

CO$$_2$$

Question 9

Calculate the formal charge on the nitrogen atom in the nitronium ion (NO$$_2^+) $$using the formula $$FC = Ve - LPe - \frac{1}{2}Be.$$

Accepted Answer

$$+1$$

Question 10

Which of the following is an exception to the octet rule?

Accepted Answer

BF$$_3$$

Question 11

A molecule has three resonance structures. What does this indicate about the bonding in the molecule?

Accepted Answer

The actual structure is a hybrid, with delocalized electrons.

Question 12

Which of the following best describes the bond order in the carbonate ion (CO$$_3$$^{2-}$$)?

Accepted Answer

1.5

Question 13

Which of the following molecules has a trigonal planar molecular geometry?

Accepted Answer

BF$$_3$$

Question 14

Which of the following statements about electronegativity and bond type is correct?

Accepted Answer

A bond with $$\Delta EN = 1.0 is $$polar covalent.

Question 15

Which of the following best explains why water (H$$_2O) is a $$polar molecule?

Accepted Answer

It has polar bonds and a bent molecular geometry.

Question 16

Which of the following molecules has an expanded octet on the central atom?

Accepted Answer

SF$$_6$$

Question 17

Which of the following best describes the effect of lone pairs on bond angles in a molecule?

Accepted Answer

Lone pairs decrease bond angles due to greater repulsion.

Question 18

Which of the following is the correct Lewis dot structure for carbon (C)?

Accepted Answer

Four dots around the symbol C

Question 19

Which of the following molecules is expected to be nonpolar based on its geometry?

Accepted Answer

CCl$$_4$$

Question 20

A molecule has the formula AX$$_5E. $$According to VSEPR theory, what is its molecular geometry?

Accepted Answer

Square pyramidal

Chemical Bonding and Molecular Structure: Study Notes

Study Guide - Practice Questions