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