Name Date Class. 3 charge, whereas Group 2A metals form ions with a 4 3. charge, and Group 3A metals form ions with a 5 charge. 4.

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1 9.1 NAMING IONS Section Review Objectives Determine the charges of monatomic ions by using the periodic table and write the names of the ions Define a polyatomic ion and write the names and formulas of the most common polyatomic ions Identify the two common endings for the names of most polyatomic ions. Vocabulary monatomic ions polyatomic ions Part A Completion Use 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. Ions that consist of a single atom are called 1 ions. 1. Metallic elements tend to 2 electrons. Group 1A ions have a 2. 3 charge, whereas Group 2A metals form ions with a 4 3. charge, and Group 3A metals form ions with a 5 charge. 4. The charge of a Group A nonmetal ion is determined by 5. subtracting 6 from the group number. For example, the 6. Group 7A elements form ions with a charge of Many of the 8 have more than one common ionic 8. charge. These ions are named using either the 9 system 9. or the 10 naming system. 10. Ions containing more than one atom are called 11 ions. 11. The names of most common polyatomic ions end in either or Chapter 9 Chemical Names and Formulas 211

2 Part B True-False Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT. 14. The names of polyatomic ions end in -ite or -ate. 15. In polyatomic ions for which there is an -ite/-ate pair, the -ite ending will always indicate one less oxygen atom than the -ate ending. 16. Polyatomic ions are anions. 17. The charge on Group A metal ions is determined by subtracting the group number from The Group 6A ions have a charge of 2. Part C Matching Match each description in Column B to the correct term in Column A. Column A Column B monatomic ions polyatomic ions cations anions a. negatively charged ions b. ions formed from single atoms c. a traditional way of naming transition metal cations d. positively charged ions 23. Part D Questions and Problems Answer the following in the space provided. 24. What is the charge on a typical ion for each of the following groups? a. 1A c. 7A b. 6A d. 2A 25. Write the name of each of the following polyatomic ions. a. HCO 3 b. NH 4 classical naming system c. MnO 4 d. OH 26. How many electrons does the neutral atom gain or lose to form each of the following ions? a. Ca 2 c. I e. ions formed from groups of atoms b. S 2 d. Mn Core Teaching Resources

3 9.2 NAMING AND WRITING FORMULAS FOR IONIC COMPOUNDS Section Review Objectives Apply the rules for naming and writing formulas for binary ionic compounds Apply the rules for naming and writing formulas for compounds with polyatomic ions Vocabulary binary compound Part A Completion Use 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 ionic compounds are named by writing the name of 1. the 1 followed by the name of the 2. Names of 2. binary compounds end in 3. For example, NaI is When a cation has more than one ionic charge, a 5 4. is used in the name. 5. Compounds with polyatomic ions whose names end in -ite 6. or -ate contain a polyatomic 6 that includes In writing the formula of an ionic compound, the net ionic charge 8. must be 8. Part B True-False Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT. 9. The systematic name for baking soda (NaHCO 3 ) is sodium bicarbonate. 10. In writing a formula for an ionic compound, the net ionic charge of the formula must be zero. Chapter 9 Chemical Names and Formulas 213

4 11. Anions that contain oxygen end in -ite or -ate. 12. The cation name is placed first when naming ionic compounds. Part C Matching Match each description in Column B to the correct term in Column A. Column A Column B binary compounds monatomic ions polyatomic ions transition metals a. ions that consist of a single atom b. ionic compounds composed of two elements c. Group B metals, many of which have more than one common ionic charge d. ions that consist of more than one atom Part D Questions and Problems Answer the following in the space provided. 17. Name the following compounds and tell what type of compound they are (binary ionic or ionic with a polyatomic ion). a. FeBr 3 b. KOH c. Na 2 Cr 2 O Write the formulas for the following compounds. a. sodium chlorate b. lead(ii) phosphate c. magnesium hydrogen carbonate 214 Core Teaching Resources

5 9.3 NAMING AND WRITING FORMULAS FOR MOLECULAR COMPOUNDS 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 Completion Use 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 1. elements. The name of this type of compound ends in Prefixes are used to show how many 3 of each element 3. are present in a molecule of the compound. For example, 4. the name of As 2 S 5 is 4. Part B True-False Classify 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. CO 2 is named monocarbon dioxide. Chapter 9 Chemical Names and Formulas 215

6 Part C Matching Match each description in Column B to the correct term in Column A. Column A Column B 8. binary molecular compound a. used to indicate the relative number of atoms of an element in a molecular compound prefix mono- tetra- 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 Part D Questions and Problems Answer the following in the space provided. 12. Name each of the following compounds. a. PCl 5 b. SO 2 c. P 4 S Write formulas for the following compounds. a. carbon tetrabromide b. dinitrogen tetroxide 216 Core Teaching Resources

7 9.4 NAMING AND WRITING FORMULAS FOR ACIDS AND BASES Section Review Objectives Apply three rules for naming acids Apply the rules in reverse to write formulas of acids Apply the rules for naming bases Vocabulary acid base Part A Completion Use 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. An acid is a compound that contains one or more 1 1. atoms and produces 2 when dissolved in water. There 2. are rules for naming acids. For example, HBr is called 3. 3 acid, whereas HNO 3 is called 4 acid. 4. A base is a(n) 5 compound that produces 6 when 5. dissolved in water. Ionic compounds that are bases are named 6. in the same way as other 7 compounds, that is, the name 7. of the 8 is followed by the name of the Part B True-False Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT. 10. A compound that contains hydrogen atoms will be an acid when dissolved in water. Chapter 9 Chemical Names and Formulas 217

8 11. An acid contains one or more hydroxide ions. 12. Chemists have a special system for naming bases. Part C Matching Match each description in Column B to the correct term in Column A. Column A 13. acid 14. base 15. aqueous solution Column B a. a compound containing hydrogen that ionizes to yield hydrogen ions in solution b. a solution in which the solvent is water c. a compound that produces hydroxide ions in water Part D Questions and Problems Answer the following in the space provided. 16. Write the formula for each acid or base. a. magnesium hydroxide b. hydrofluoric acid c. phosphoric acid d. lithium hydroxide 17. Name each acid or base. a. KOH b. HI c. H 2 SO Core Teaching Resources

9 9.5 THE LAWS GOVERNING FORMULAS AND NAMES Section Review Objectives Define the laws of definite proportions and multiple proportions Apply the rules for writing chemical formulas by using a flowchart Apply the rules for naming chemical compounds by using a flowchart Vocabulary law of definite proportions law of multiple proportions Part A Completion Use 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. [Use Figure 9.20 to complete this exercise.] The law of 1 states that in samples of any chemical 1. compound, the masses of the elements are always in the same The law of 3 states that whenever the same two 3. elements form more than one compound, the different masses 4. of one element that combine with the same mass of the other 5. element are in the ratio of 4 numbers. 6. H 3 PO 4 is a(n) 5. It is called CCl 4 is not a(n) 7. It contains two elements, so it is a 8. 8 compound. It does not contain a metal, so it is a binary 9. 9 compound. The compound is called Pb(C 2 H 3 O 2 ) 2 is not a(n) 11. It contains more than two C 2 H 3 O 2 is a polyatomic 13. Pb is a Group metal. The compound is called Chapter 9 Chemical Names and Formulas 219

10 Part B True-False Classify each of these statements as always true, AT; sometimes true, ST; or never true, NT. 16. Roman numerals are used when naming Group B metal cations. 17. Names of compounds containing polyatomic anions end in -ide. 18. Prefixes are used when naming binary ionic compounds. 19. Compounds containing two elements are called binary compounds. Part C Questions and Problems Answer the following in the space provided. 20. Name the following compounds. a. Pb(C 2 H 3 O 2 ) 4 b. HF c. P 2 O 5 d. LiBr 21. Write formulas for the following compounds. a. phosphorus pentachloride b. iron(ii) oxide c. nitric acid d. potassium chloride e. calcium nitrate 220 Core Teaching Resources

Chemistry--Unit 2: Chemical Names and Formulas Test Review

Chemistry--Unit 2: Chemical Names and Formulas Test Review vocab anion binary compound cation chemical formula formula unit ion ionic compound law of definite proportions law of multiple proportions molecular formula polyatomic ion representative particle ternary