(Polar molecules, Non-polar molecules, etc.)
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Ryan Chew 1C wrote:Do we need to know the exact bond angles for molecular shapes that have lone electron pairs or can we just say slightly less than 109.5 degrees for AX3E and AX2E2 (NH3 and H2O)?
Professor Lavelle actually talked about this in lecture. It's practically impossible for us to know what the angle is unless you perform an experiment. Thus, it's just sufficient to say that the angle is less than a given angle (i.e. less than 120 degrees).
You can make approximations (slightly less than __) but the only important thing is to know the concept behind why that is. The lone pairs have a greater repulsion that makes the bond angles slightly smaller than they should ideally be.
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