2. Chp.12/Activity #3 Chemical Names & Formulas (page 787) Due Today: Chpt 12 Act3 Chem Talk Checking up Please put in basket in the front!! Learning targets Determine formulas of covalent compounds Write the name of covalent compounds 2/11/2015 Wednesday

3. Get the name/formula for the following ionic compounds. 1.FeCl 2 2.PbO 2 3.Nickle (III) Oxide 4.Silver Bromide 5.BaCl 2 6.Barium Phosphide Good job! Iron (II) Chloride Lead (IV) Oxide Ni 2 O 3 AgBr Barium Chloride Ba 3 P 2

4. Covalent Bonds and Covalent Molecules Polyatomic ions or molecules like O 2, CO 2 do not have ionic bonds. There are no Cations or Anions within them. These molecules form Covalent Bonds instead. Co – sharing Valence – valence electrons

5. A Covalent bond involves the sharing of electrons. Covalent molecules share electrons to make an Octet (stable).

6. How do we know a compound is Covalent? Covalent Compounds do not have anions and cations. Consequently, they are usually made up of non-metals. If it’s not an ionic compound, it’s covalent. Learn more about it in HS chemistry.

7. Can you see which compounds are covalent? 1.NaCl 2.CO 3.O 2 4.Al 2 (CO 3 ) 3 5.Mercury (II) Selenide 6.C 6 H 12 O 6 7.Magnesium Oxide 8.Carbon Dioxide Ionic Covalent both Ionic Covalent Ionic Covalent

8. Naming Covalent Compounds (Nomenclature) 1. The first element is named first, using the elements name. The atom in the lower group comes first. 2. Second element is named with an -ide ending. 3. Prefixes are used to denote the number of atoms. E.g. mono – 1, di – 2, tri – 3, tetra – 4 4. "Mono" is not used to name the first element. E.g. CO 2 is called Carbon Dioxide

9. Prefixnumber indicated mono-1 di-2 tri-3 tetra-4 penta-5 hexa-6 hepta-7 octa-8 nona-9 deca-10

10. Can you name these covalent molecules? 1.SiF 4 2.CO 3.N 2 F 6 4.CBr 4 5.NCl 3 6.P 2 S 3 7.Carbon Tetrachloride 8.Disulfur Monoxide Silicon tetrafluoride Carbon monoxide Dinitrogen hexafluoride Carbon tetrabromide Nitrogen trichloride Diphosphorous trisulfide CCl 4 S2OS2O

11. Can you name these covalent molecules? 1.Dihydrogen monoxide 2.Dihydrogen dioxide 3.Trinitrogen tetraoxide 4.Iodine pentafluoride 5.N 2 O 3 6.PI 3 7.Si 2 Br 6 8.Tetraphosphorus decaoxide H2OH2O H2O2H2O2 N3O4N3O4 IF 5 Dinitrogen trioxide Phosphorous triiodide Disilicon hexabromide P 4 O 10