Gen Chem 1

Gen Chem 1 Module 1 Module 2 Module 3 Module 4 Module 5 Module 6 Module 7

Inclusive Review of Topics

Determine the number of valence electrons that will be used in the structural formulas of the following chemicals. Identify polar bonds, electron geometry, and the molecular geometry of the chemical. Calculate the formal charge on elements other than H. If there could be (a) resonance structure(s) draw it (them).

Ex. CO₂

C = 4 valence e^—

O = 6 valence e^—

Molecular Geometry = Linear

Electron Geometry = Linear

Formal Charge C = (valence electrons) – (bonds around target atom) – (unbonded electrons)

Formal Charge C = 4-4-0

Formal Charge C = 0

Formal Charge O = (valence electrons) – (bonds around target atom) – (unbonded electrons)

Formal Charge O= 6-2-4

Formal Charge O = 0

No resonance because there is nowhere for a pi bond to trade with a lone pair and maintain the octet rule.