Chp.12/Activity #3
2/11/2015
Wednesday
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
Get the name/formula for the following ionic compounds.
1. FeCl2
Iron (II) Chloride
2. PbO2
Lead (IV) Oxide
3. Nickle (III) Oxide
Ni2O3
4. Silver Bromide
AgBr
5. BaCl2
Barium Chloride
Ba3P2
6. Barium Phosphide
Good job!
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. NaCl
Ionic
2. CO
Covalent
3. O2
Covalent
4. Al2(CO3)3
both
Ionic
5. Mercury (II) Selenide
Covalent
6. C6H12O6
Ionic
7. Magnesium Oxide
Covalent
8. Carbon Dioxide
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
monoditritetrapentahexaheptaoctanonadeca-
number indicated
1
2
3
4
5
6
7
8
9
10
Can you name these covalent molecules?
Silicon tetrafluoride
1. SiF4
Carbon monoxide
2. CO
Dinitrogen hexafluoride
3. N2F6
Carbon tetrabromide
4. CBr4
Nitrogen trichloride
5. NCl3
Diphosphorous trisulfide
6. P2S3
CCl4
7. Carbon Tetrachloride
S2O
8. Disulfur Monoxide
Can you name these covalent molecules?
1. Dihydrogen monoxide
H2O
2. Dihydrogen dioxide
H2O2
N3O4
3. Trinitrogen tetraoxide
IF5
4. Iodine pentafluoride
Dinitrogen trioxide
5. N2O3
Phosphorous triiodide
6. PI3
Disilicon hexabromide
7. Si2Br6
8. Tetraphosphorus decaoxide P4O10