Chapter 9 Chemical Names and Formulas 215

Section Review

Objectives• Interpret the prefixes in the names of molecular compounds in terms of their

chemical formulas

• Apply the rules for naming and writing formulas for binary molecular compounds

Part A CompletionUse this completion exercise to check your understanding of the concepts and terms

that are introduced in this section. Each blank can be completed with a term, short

phrase, or number.

Binary molecular compounds are composed of two 1.

elements. The name of this type of compound ends in . 2.

Prefixes are used to show how many of each element 3.

are present in a molecule of the compound. For example, 4.

the name of As2S5 is .

Part B True-FalseClassify each of these statements as always true, AT; sometimes true, ST; or never true, NT.

________ 5. Binary molecular compounds contain carbon.

________ 6. Charges must be balanced when writing formulas for molecular

compounds.

________ 7. CO2 is named monocarbon dioxide.

4

3

2

1

Name ___________________________ Date ___________________ Class __________________

NAMING AND WRITING FORMULAS

FOR MOLECULAR COMPOUNDS9.3

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.

216 Core Teaching Resources

Part C MatchingMatch each description in Column B to the correct term in Column A.

Part D Questions and ProblemsAnswer the following in the space provided.

12. Name each of the following compounds.

a. PCl5

b. SO2

c. P4S10

13. Write formulas for the following compounds.

a. carbon tetrabromide

b. dinitrogen tetroxide

Column B

a. used to indicate the relative number of atoms of an

element in a molecular compound

b. prefix indicating one atom of an element in a molecule

c. prefix indicating four atoms of an element in a molecule

d. nonionic compound containing atoms of two elements

Column A

binary molecular

compound

prefix

mono-

tetra-

________ 8.

________ 9.

________ 10.

________ 11.

Name ___________________________ Date ___________________ Class __________________

© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.