1. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 1 Naming Covalent Compounds Naming and Writing Covalent Formulas NO nitrogen oxide NO 2 nitrogen dioxide N 2 O 4 dinitrogen tetroxide

2. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. Guide to Naming Covalent Compounds with Two Nonmetals 2

3. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 3 Names of Covalent Compounds Prefixes are used  in the names of covalent compounds  because two nonmetals can form two or more different compounds Examples of compounds of N and O: NO nitrogen oxide NO 2 nitrogen dioxide N 2 O dinitrogen oxide N 2 O 4 dinitrogen tetroxide N 2 O 5 dinitrogen pentoxide

4. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 4 Naming Covalent Compounds STEP 1 Name the first nonmetal by its element name. STEP 2 Name the second nonmetal with an ide ending. STEP 3 prefixes to indicate the number (from subscripts) of atoms of each nonmetal. (Mono is usually omitted from the first element, sometimes from the second.)

5. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 5 What is the name of SO 3 ? STEP 1 The first nonmetal is S sulfur. STEP 2 The second nonmetal is O, named oxide. STEP 3 The subscript 3 of O is shown as the prefix tri. SO 3 → sulfur trioxide The subscript 1(for S) or mono is understood. Naming Covalent Compounds (Continued)

6. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 6 Name P 4 S 3 STEP 1 The first nonmetal P is phosphorus. STEP 2 The second nonmetal S is sulfide. STEP 3 The subscript 4 of P is shown as tetra. The subscript 3 of O is shown as tri. P 4 S 3 → tetraphosphorus trisulfide Naming Covalent Compounds (Continued)

7. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 7 Formulas and Names of Some Covalent Compounds

8. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. Flowchart for Naming Covalent Compounds with Two Nonmetals 8

9. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 9 Select the correct name for each compound. A.SiCl 4 1) silicon chloride 2) tetrasilicon chloride 3) silicon tetrachloride B. P 2 O 5 1) phosphorus oxide 2) phosphorus pentoxide 3) diphosphorus pentoxide C.Cl 2 O 7 1) dichlorine heptoxide 2) dichlorine oxide 3) chlorine heptoxide Learning Check

10. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 10 Select the correct name for each compound. A.SiCl 4 3) silicon tetrachloride B. P 2 O 5 3) diphosphorus pentoxide C.Cl 2 O 7 1) dichlorine heptoxide Solution

11. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 11 Write the name of each covalent compound. CO_____________________ CO 2 _____________________ PCl 3 _____________________ CCl 4 _____________________ N 2 O_____________________ Learning Check

12. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 12 Write the name of each covalent compound. CO carbon monoxide CO 2 carbon dioxide PCl 3 phosphorus trichloride CCl 4 carbon tetrachloride N 2 Odinitrogen oxide Solution

13. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. Guide to Writing Formulas for Covalent Compounds 13

14. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 14 Write the formula for carbon disulfide. STEP 1 Elements are C and S STEP 2 No prefix for carbon means 1 C Prefix di = 2 Formula: CS 2 Writing Formulas of Covalent Compounds

15. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 15 Write the correct formula for each of the following: A. phosphorus pentachloride B. dinitrogen trioxide C. sulfur hexafluoride Learning Check

16. General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc. 16 Write the correct formula for each of the following: A. phosphorus pentachloride 1P penta = 5ClPCl 5 B. dinitrogen trioxide di = 2N tri = 3 O N 2 O 3 C. sulfur hexafluoride 1S hexa = 6FSF 6 Solution