Chp.12/Activity #3 Chemical Names & Formulas (page 787)

Due Today:

Chpt 12 Act3 Chem Talk Checking upPlease put in basket in the front!!

Learning targets•Determine formulas of covalent compounds•Write the name of covalent compounds

2/11/2015Wednesday

Get the name/formula for the following ionic compounds.1. FeCl2

2. PbO2

3. Nickle (III) Oxide4. Silver Bromide5. BaCl2

6. Barium Phosphide

Good job!

Iron (II) ChlorideLead (IV) OxideNi2O3

AgBrBarium ChlorideBa3P2

Covalent Bonds and Covalent Molecules• Polyatomic ions or molecules like O2, CO2 do not have ionic bonds.• There are no Cations or Anions within them.

• These molecules form Covalent Bonds instead.• Co – sharing• Valence – valence electrons

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

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.

Can you see which compounds are covalent?1. NaCl2. CO3. O2

4. Al2(CO3)3

5. Mercury (II) Selenide6. C6H12O6

7. Magnesium Oxide8. Carbon Dioxide

IonicCovalentCovalentbothIonicCovalentIonicCovalent

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. CO2 is called Carbon Dioxide

Prefix number indicatedmono- 1

di- 2tri- 3

tetra- 4penta- 5hexa- 6hepta- 7octa- 8nona- 9deca- 10

Can you name these covalent molecules?1. SiF4

2. CO3. N2F6

4. CBr4

5. NCl3

6. P2S3

7. Carbon Tetrachloride8. Disulfur Monoxide

Silicon tetrafluorideCarbon monoxideDinitrogen hexafluorideCarbon tetrabromideNitrogen trichlorideDiphosphorous trisulfide

CCl4

S2O

Can you name these covalent molecules?1. Dihydrogen monoxide2. Dihydrogen dioxide3. Trinitrogen tetraoxide4. Iodine pentafluoride5. N2O3

6. PI3

7. Si2Br6

8. Tetraphosphorus decaoxide

H2OH2O2

N3O4

IF5

Dinitrogen trioxidePhosphorous triiodideDisilicon hexabromideP4O10