Question 1

Which of the following compounds is correctly named according to the rules for naming molecular compounds?

Accepted Answer

Dinitrogen monoxide ($$\mathrm{N_2O})$$

Question 2

What is the correct formula for sulfur hexafluoride?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 3

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetals

Question 4

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

Accepted Answer

$$\mathrm{N_2$}$$

Question 5

How many total valence electrons are present in the Lewis structure of $$\mathrm{$$PCl_3$$}$$?

Accepted Answer

26

Question 6

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

Accepted Answer

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

Question 7

Which of the following compounds is molecular and not ionic?

Accepted Answer

$$\mathrm{N_2O}$$

Question 8

What is the correct name for $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

Phosphorus pentachloride

Question 9

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

Accepted Answer

There are not enough valence electrons to complete the octets with single bonds alone

Question 10

Which of the following is the correct Lewis structure for $$\mathrm{CH_4$} ($$methane)?

Accepted Answer

A central C atom with four single bonds to four H atoms, no lone pairs on C

Question 11

Which of the following compounds is used as a propellant in aerosols and also forms dry ice?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 12

What is the correct formula for dinitrogen trioxide?

Accepted Answer

$$\mathrm{N_2O_3}$$

Question 13

Which of the following is a correct step in drawing a Lewis structure for a molecule?

Accepted Answer

Count the total number of valence electrons for all atoms in the molecule

Question 14

Which of the following elements is most likely to form multiple bonds (double or triple) in a molecule?

Accepted Answer

Oxygen

Question 15

A molecule of $$\mathrm{SO_2$} is $$used as a preservative in fruits. What is the correct name for $$\mathrm{SO_2$}$$?

Accepted Answer

Sulfur dioxide

Question 16

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

Accepted Answer

Ionic compounds contain a metal and a nonmetal; molecular compounds contain only nonmetals

Question 17

Which of the following is the correct name for $$\mathrm{CS_2$}$$?

Accepted Answer

Carbon disulfide

Question 18

How many lone pairs of electrons are present on the central atom in the Lewis structure of $$\mathrm{NH_3$}$$?

Accepted Answer

1

Question 19

Which of the following is the correct formula for phosphorus pentachloride?

Accepted Answer

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

Question 20

A student draws the Lewis structure for $$\mathrm{$$SiF_4$$}$$ and finds that each F atom has three lone pairs and is bonded to Si by a single bond. What is the total number of valence electrons in $$\mathrm{$$SiF_4$$}$$?

Accepted Answer

32

Chemical Bonding: Molecular and Lewis Structures (Chapter 6.5–6.6 Study Notes)

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