Naming Molecular Compounds Chemical Bonding IV Lewis Structures

Naming Molecular Compounds Chemical Bonding IV

Lewis Structures • Nonpolar Covalent - no charges • Polar Covalent - partial charges + +

What to know about Covalent Bonds • Covalent molecules are made up of? • The electrons are being?

How to write names and formulas • Prefix System (binary compounds) 1. How do we recognize these? Because they’re made up of 2 nonmetals? Where are nonmetals found? ? ? 2. Add prefixes to indicate # of atoms. Omit monoprefix on first element. 3. Change the ending of the second element to -ide.

Molecular Nomenclature PREFIX monoditritetrapentahexaheptaoctanonadeca- NUMBER 1 2 3 4 5 6 7 8 9 10

Special Rules with Mono • If there is only one of the first element, then the prefix mono is not used. • If there is only one of the second element, then the prefix mono is necessary. • Ex. • CO – Carbon Monoxide • CO 2 – Carbon Dioxide • C 2 O – Dicarbon Monoxide

Also…. There is no simplifying for covalent compounds. What you see is what you get. If you simplify, you would change the chemical formula and ratio of the elements in the bond…. Not good…. • C 2 H 4 - Dicarbon Tetrahydride • CH 2 - Carbon Dihydride • N 3 O 6 - Trinitrogen Hexaoxide • NO 2 - Nitrogen Dioxide

Writing Names Practice CCl 4 Formula CF 4 H 2 O NH 3 Si. O 2 PH 3 Carbon Tetrachloride Name

Writing Formulas Practice CCl 4 Formula Carbon Tetrachloride Name Nitrogen monoxide Tetraphosphorous pentaoxide Dicarbon Diiodide Trinitrogen Hexoxide Heptachlorine Nonahydride

Molecular Nomenclature • The Seven Diatomic Elements Br 2 I 2 N 2 Cl 2 H 2 O 2 F 2 H N O F Cl Br I