Question 1

Which of the following correctly names the compound $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 2

What is the correct formula for sulfur hexafluoride?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 3

Which of the following compounds is ionic?

Accepted Answer

$$\mathrm{K_2O}$$

Question 4

How many total valence electrons are present in a molecule of $$\mathrm{NH_3$} ($$ammonia)?

Accepted Answer

Question 5

Which of the following is the correct Lewis structure for $$\mathrm{F_2$}$$?

Accepted Answer

Each F atom shares one pair of electrons (single bond) and has three lone pairs.

Question 6

What is the correct name for $$\mathrm{$$NCl_3$$}$$?

Accepted Answer

Nitrogen trichloride

Question 7

Which of the following elements exists as a diatomic molecule in its natural state?

Accepted Answer

Chlorine

Question 8

What is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 9

Which of the following statements about covalent bonds is TRUE?

Accepted Answer

Covalent bonds involve the sharing of electrons between nonmetal atoms.

Question 10

How many bonding pairs and lone pairs are present on the central atom in $$\mathrm{$$PCl_3$$}$$?

Accepted Answer

3 bonding pairs, 1 lone pair

Question 11

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

Accepted Answer

Hydrogen in $$\mathrm{H_2$}$$

Question 12

What is the correct name for $$\mathrm{CO}$$?

Accepted Answer

Carbon monoxide

Question 13

Which of the following correctly describes a double bond?

Accepted Answer

A double bond involves two pairs of shared electrons between two atoms.

Question 14

Which of the following is the correct Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 15

Which of the following compounds contains a triple bond in its Lewis structure?

Accepted Answer

$$\mathrm{N_2$}$$

Question 16

What is the correct formula for phosphorus trichloride?

Accepted Answer

$$\mathrm{$$PCl_3$$}$$

Question 17

Which of the following best explains why prefixes are used in naming molecular compounds?

Accepted Answer

Because multiple compounds can be formed from the same two nonmetals

Question 18

Which of the following is the correct name for $$\mathrm{B_2O_3}$$?

Accepted Answer

Diboron trioxide

Question 19

A molecule of $$\mathrm{CH_4$} ($$methane) contains how many single covalent bonds?

Accepted Answer

4

Question 20

Which of the following molecules has a central atom with more than an octet of electrons in its Lewis structure?

Accepted Answer

$$\mathrm{SF_6$}$$

Molecular Compounds: Covalent Bonding, Naming, and Lewis Structures

Study Guide - Practice Questions