8 Chemical Names to Formulas Write the chemical formula of Potassium Iodide.Find the charge of each ionPotassium ion = K+1Iodine ion = I-1The ratio is 1 to 1, so the formula is KI
9 Chemical Names to Formulas Write the chemical formula of Potassium Oxide.Find the charge of each ionPotassium ion = K+1Oxygen ion = O-2The ratio is 1 to 2, so there must be 2 K for each O = K2OOR cross the charges down
10 Chemical Names to Formulas Write the chemical formula for Aluminum Nitride.Find the charge of each ion.Aluminum ion = Al+3Nitrogen ion = N-3Ratio is 3 to 3, or Al3N3 Reduce like a fraction.AlN
11 Practice Problems Textbook Page 187 - formula to names Page names to formula
12 Multivalent Metal Ionic Compounds - Multi means more than one- Valent refers to the valence electronsSo multivalent metals are metals with more than one charge.Example: Copper, Cu (#29)It can be Cu+1 or Cu +2 . Need to know which one!
13 Multivalent Metal Ionic Compounds Write the chemical formula for:1. Copper (I) fluoride2. Copper (II) fluoride3. Copper (II) nitride4. Copper (II) oxide
14 Multivalent Metal Ionic Compounds Write the chemical formula for:1. Copper (I) fluoride = CuF2. Copper (II) fluoride = CuF23. Copper (II) nitride = Cu3N24. Copper (II) oxide = CuO
15 Multivalent Metal Ionic Compounds Use brackets ( ) and Roman numerals (I, II, III, IV, V, VI, ...)in the chemical name.Examples:Write the chemical name of:1. CuF2. CuCl23. PbO4. PbO2
16 Multivalent Metal Ionic Compounds Use brackets ( ) and Roman numerals (I, II, III, IV, V, VI, ...)in the chemical name.Examples:Write the chemical name of:1. CuF = Copper (I) Fluoride2. CuCl2 = Copper (II) Chloride3. PbO = Lead (II) Oxide4. PbO2 = Lead (IV) Oxide
17 Polyatomic Ions Poly = many atomic = atoms Polyatomic Ions = ions with many different atoms. They stick together, treat them as one thing.Look in the table for the name and formula.Example: Sodium Nitrate = NaNO3Sodium ion = Na+Nitrate ion = NO3-
18 Polyatomic Ions Use brackets to show how many polyatomic ions. Example: Zinc HydroxideZinc ion = Zn+2Hydroxide ion = OH-1Zn(OH)2
19 Polyatomic Ions Examples Write the name of: 1. LiCH3COO 2. Mg3(PO3)2 3. CrSO4Write the formula of:4. Calcium Perchlorate5. Lead (IV) Chromate6. Ammonium Sulfite
20 Polyatomic Ions Examples Write the name of: 1. LiCH3COO = Lithium Acetate2. Mg3(PO3)2 = Magnesium Phosphite3. CrSO4 = Chromium (II) SulfateWrite the formula of:4. Calcium Perchlorate = Ca(ClO4)25. Lead (IV) Chromate = Pb(CrO4)26. Ammonium Sulfite = (NH4)2SO3
22 Naming Covalent Compounds Check that it IS a covalent compound first!Two non-metalsRecall: Ionic or Covalent Compound?1. NaCl2. CH43. S5Br184. MgO5. NO
23 Naming Covalent Compounds Use a prefix to show how many of each elementFirst element - name stays the same. Only add a prefix if there is more than one.Second element - change the ending to "-ide"Example: CO2 = Carbon dioxide
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