1. Chapter 9.5 The Laws Governing Formulas and Names BY: Alex Badawi Due: 5/18/13 Chemistry!

2. Key Terms These key terms are in the first 2 pages of the lesson, and I was advised not to use any information on the these 2 pages. So basically there are no key terms for this lesson.

3. Key Concepts 1. How should you use a flowchart to name a chemical compound? 1. Follow the arrows and answer the questions on the flowchart to write the correct name for a compound.

4. Key Concepts (continue) 2. What are the four guidelines for writing the formulas of chemical compounds? 2. 1. An -ide ending generally indicates a binary compound. 2. An -ite or -ate ending means a polyatomic ion that includes oxygen is in the formula. 3. Prefixes in a name generally indicate that the compound is molecular. 4. A Roman numeral after the name of a cation shows the ionic charge of the cation.

5. Practicing Skills Naming Chemical Compounds In this Chapter you learned two basic skills that could help you to deal with an emergency involving chemicals: writing chemical formulas and naming chemical compounds. You may find it difficult to know when you should or should not use prefixes and Roman numerals in a name, or you may have trouble determining if a compound's name should end in -ate, -ide, or -ite. The next slide will show you ways to write chemical products.

6. Practicing Skills Writing Chemical Formulas The second key concept explained the ways to write chemical formulas. Here is an example: Writing the formula for sodium chromate, there is no prefix to it, so it has to be ionic. The ions are sodium ion and chromate ion.

7. Examples Calcium ChlorideNaCO 3 CaCl 2 Sodium Carbonate-Element Calcium= CaNa= Sodium Chlorine= ClC= Carbon O= Oxygen -Ions CO 3 = Carbonate Ca= +2 cations-Ions Cl= -1 anionsNa= +1 cation CO 3 = -2 anions

8. Practice Problems 1. Name Ca(ClO 3 ) 2 in word form. 2. Name KCrO 4 in word form. 3. Name CaF in word form. 4. Name Iron(II) Sulfate in formula form. 5. Name SnCr 2 O 7 in word form. 6. Identify the incorrect names or formulas. a. calcium(II) oxideb. aluminum oxide c. Na 2 C 2 O 4 d. Mg(NH 4 ) 2 7. Write formulas for these compounds. a. tin(II) hydroxideb. barium fluoride

9. Practice Problems(continued) 8. Write MgSO 4 in word form. 9. Write Calcium Selenide in a formula form. 10. Write P 2 O 5 in word form.

10. END OF SHOW!!!