Drawing Lewis Dot Structures Covalent compounds 1. Figure valence e- for each atom 2. Draw Lewis Dot Structure 3. Combine atom so each has 8 e- exception.

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Presentation transcript:

Drawing Lewis Dot Structures Covalent compounds 1. Figure valence e- for each atom 2. Draw Lewis Dot Structure 3. Combine atom so each has 8 e- exception - H - needs 2e- only 4. Turn pairs of shared e- into ( )

H 2 O (covalent) + H H O HH O HH O Dashes represent 2 shared e-

Example CH 4 HHHH C C H H H H C H H HH

Bonds & Electron sharing 2. Double Bond O = O 2 e- shared 1. Single bond C C 4 e- shared 6 e- shared 3. Triple bond C O

Show examples on the board or overhead - single bond double bond O 2 triple bond C to C - C 2 H 2

Example CO 2 C OOOO C O = C = O Lone pair of e-

Naming compounds - simple covalent 1. Nonmetal farthest left 2. Other non-metal w/ “-ide” ending 3. Add prefixes - # of each element (if needed)

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

Examples NO - Nitrogen monoxide NO 2 - Nitrogen dioxide N 2 O - dinitrogen monoxide N 2 O 5 - dinitrogen pentoxide