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Chemical Names of Ionic Compounds

Chemical Names of Ionic Compounds. Lesson 7. What are Ionic Compounds?. Ionic compounds are made up of positive and negative ions. All of the positive and negative ions for a pattern Negative and positive ions attract. Negative and negative and positive and positive repel.

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Chemical Names of Ionic Compounds

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  1. Chemical Names of Ionic Compounds Lesson 7

  2. What are Ionic Compounds? • Ionic compounds are made up of positive and negative ions. • All of the positive and negative ions for a pattern • Negative and positive ions attract. • Negative and negative and positive and positive repel. • Ionic compounds form solid crystals. • Ionic compounds are like a solid stack of bricks.

  3. Where does our salt come from?

  4. Naming Ionic Compounds • Formula for naming ionic compounds • positive ion + negative ion + -ide. If a compounds contains 2 elements the first is ALWAYS a metal If a compounds contains 2 elements the second is ALWAYS a non-metal • For example: magnesium (metal) and oxygen (non-metal). • STEP 1: The positive ion is the first part of the name • STEP 2: The negative ion forms part of the ending of the name • STEP 3: Add -ide to the end of the name • magnesium • oxygen -ide Magnesiumoxide

  5. Try these P 186-187 text • Calcium and Bromine • Lithium and Nitrogen • Zinc and Sulfur Calcium bromide Lithiumnitride Zincsulfide

  6. Writing formulas for Ionic Compounds • Ionic formulas are based on the ions of the atoms involved • Example: What is the name of Ca3N2? • Ca is the positive ion and is calcium. • N is the negative ion and is nitrogen. • Drop the ending of the negative ion, nitrogen and add -ide. • Calcium nitride

  7. Writing formulas for Ionic Compounds continued Rules for writing formulas of ionic compounds • In an ionic compound, the positive charges balance out the negative charges. • The ratio of positive to negative charges gives the proper formula. • The ratio is always written in reduced form.

  8. Example: Hydrogen chloride • Identify each ion and its charge • Determine the total charges needed to balance positive and negative • Note the ratio of positive ions to negative ions • Use subscripts to write the formula, 1’s are not shown in subscript H+ and Cl- ions Total charge to balance +1 = -1 ratio 1 : 1 formula HCl

  9. Example: Potassium and Sulfur K+ and S2- ions Total charge to balance +1+1 = -2 ratio 2 : 1 formula K2S

  10. Example: Aluminum and Sulfur Al3+ and S2- ions Total charge to balance +3+3 = -2-2-2 ratio 2 : 3 formula Al2S3

  11. Formulas are always written in their most reduced form Ca2+ and O2- ions Total charge to balance +2 = -2 ratio 1 : 1 formula Ca2O2 Simplify and write in most reduced form CaO

  12. Homework Key Points from Today Name of a compound=words (element names spelled out) Formula of a compound=symbols (element symbols and subscripts) • Workbook, p62 #1-3 • Text book, p187 #1 a,c,e,g,h,i To help you practice naming ionic compounds and writing ionic formulas

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