(Polar molecules, Non-polar molecules, etc.)
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I'm sure there's a way to investigate the exact effect that a lone pair has on each bond angle (either through mathematical calculations or experimental observation), but I think that's well beyond the scope of this class. Lavelle said multiple times in class that, as long we understand that there is an effect on bond angles due to lone pair repulsions, we're fine. In any question that asks for bond angles, it's acceptable to put "The expected bond angle would be less than X degrees because of the lone pair, which is pushing the atoms closer together".
A lone pair has greater repulsion than bonded electrons and will cause the bond angles between the other atoms to decrease due to this repulsion. There is not a way to know how much a lone pair will decrease a bond angle, but as long as we know that a lone pair results in a bond angle that is lower than what it was before it should be fine. We will not be asked to state a specific number for a bond angle that has been altered by a lone pair.
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