Topic: Chemical Bonding

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Topic: Chemical Bonding Aim: How do you determine if a molecule is polar or nonpolar? Do Now: what is a polar covalent bond? A nonpolar covalent bond? Give an example formula of each. HW: RB p. 107-108 #18-25 Text p. 253 #32, 34

Molecular Polarity DIFFERENT FROM BOND POLARITY The type of bond has nothing to do with it Questions will be specific Will state “polar/nonpolar BOND” or “polar/nonpolar MOLECULE” READ.

Molecular Polarity MOLECULES can be POLAR or NONPOLAR Look at SHAPE Look at DISTRIBUTION OF CHARGE Are bonds the same all the way around?

Nonpolar Molecules Symmetrical in SHAPE Examples? CO2, All diatomics - Symmetrical LINEAR CH4 - Symmetrical TETRAHEDRONS Nonpolar molecules will dissolve in nonpolar solvents (like dissolves like) Oil-based paints and paint thinner Acetone & nail polish Acetone & styrofoam

Polar Molecules Asymmetrical in SHAPE Examples? HCl - Asymmetrical LINEAR H2O - ALL BENT NH3 - TRIGONAL PYRAMIDAL CH3Cl – tetrahedrons not the same on all sides Polar molecules will dissolve in polar substances (like dissolves like)

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When in doubt… …draw it out! SNAP! Symmetrical, Nonpolar Asymmetrical, Polar