Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of valence electrons between two nonmetal atoms.

Question 2

What is the correct name for the compound with the formula $$\mathrm{N_2O_3}$$?

Accepted Answer

Dinitrogen trioxide

Question 3

Which of the following compounds is molecular?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 4

What is the correct formula for sulfur hexafluoride?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 5

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

Accepted Answer

$$\mathrm{O=C=O}$$ with each O having two lone pairs

Question 6

Which of the following steps is NOT part of drawing a Lewis structure for a molecule?

Accepted Answer

Assign formal charges to each atom before adding lone pairs.

Question 7

A molecule of $$\mathrm{N_2$}$$ contains which type of bond?

Accepted Answer

A triple covalent bond

Question 8

Which of the following is the correct name for $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

Phosphorus pentachloride

Question 9

Which of the following statements about molecular compounds is TRUE?

Accepted Answer

They are formed when two or more nonmetals share electrons.

Question 10

What is the correct formula for dinitrogen trioxide?

Accepted Answer

$$\mathrm{N_2O_3}$$

Question 11

Which of the following molecules is most likely to form multiple bonds (double or triple)?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 12

A student is asked to draw the Lewis structure for $$\mathrm{PF_3$}. $$Which of the following is correct?

Accepted Answer

P is the central atom, with three single bonds to F atoms, and one lone pair on P.

Question 13

Which of the following best explains why double and triple bonds form in some molecules?

Accepted Answer

Because there are not enough valence electrons to complete the octets with single bonds.

Question 14

Which of the following is the correct name for $$\mathrm{NO}$$?

Accepted Answer

Nitrogen monoxide

Question 15

A patient is exposed to $$\mathrm{N_2O} as an $$anesthetic. What is the correct name for this compound?

Accepted Answer

Dinitrogen oxide

Question 16

Which of the following is a correct step in naming a molecular compound?

Accepted Answer

Use prefixes to indicate the number of each type of atom.

Question 17

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 18

Which of the following best describes the difference between ionic and molecular compounds?

Accepted Answer

Ionic compounds are formed from metals and nonmetals, while molecular compounds are formed from nonmetals only.

Question 19

A chemist needs to write the formula for phosphorus pentachloride. What is the correct formula?

Accepted Answer

$$\mathrm{$$PCl_5$$}$$

Question 20

Which of the following is a real-world application of $$\mathrm{CO_2$} as a $$molecular compound?

Accepted Answer

Used in fire extinguishers and carbonation of beverages

Chemical Bonding: Molecular Compounds and Lewis Structures

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