19'2 Chemical Formulas Ionic Compounds

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19.2 Chemical FormulasIonic Compounds

• Courtney Lewis
• CPO ScienceUnit 7 Chapter 19
• Stapley Junior High School

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Compounds

• ALL compounds have a charge of zeroneutral
• Oxidation Number
• of electrons lost, gained, or shared
• Positive or negative
• Write the number and then the sign ( or -)

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Predicting Oxidation Numbers

• Use the Periodic Table

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Chemical Formulas for Ionic Compounds

• Monatomic Ions
• Write the symbol for the monatomic ion that has a
  positive charge first
• Write the symbol for the monatomic ion that has a
  negative charge second
• Add subscripts so the charges add to zero

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Examples

• Sodium and Chlorine
• Calcium and Chlorine
• Iron (III) and Oxygen

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Homework

• Skill Sheet 19B Chemical Formulas p. 1 2
• DUE Wednesday, December 5, 2007
• Assignment 19.1 p. 347 Concept Review 17,
  Problems 12
• DUE Thursday, December 6, 2007