(Polar molecules, Non-polar molecules, etc.)
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When tested and asked for the bond angle, are we expected to be very specific? For example, if the shape is trigonal pyramidal and we say the bond angle is 109.5 degrees instead of slightly less than 109.5 degrees, will we loose points??
I believe we will not need to know specific bond angles when there are lone pairs. The interaction between a lone pair and bond pair, which is a repulsion, changes the bond angle to a lower value, but we cannot be certain to what degree this change will be. As a result, all we can state is that the bond angle is less than the ideal bond angle from a similar molecular shape.
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