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1) dsp3 hybridized
2)No NCl5 can not exist because as Q1 above stated the hybridization on the central atom is dsp3 hybridized. Since it requires that the N have an atomic d orbital to obtain this type of hybridized orbital and N (since it is in the 2nd energy level or it only has s and p orbitals) does not have them, it can hybridize so it can not exist.
3) Arrow over the more electronegative atom (or whatever way you memorize the symbol).
4) Ionic deltaEN> or = 1.7
polar bond is 1.7<deltaEN> or = 0.8
non-polar deltaEN<0.8
5) Assume polar prove non-polar
6) ionic/metallic, polar molecules, non-polar molecules
7) NH3 because all substances have hydrogen bonding so it is the one that has the most hydrogen bonds (3 of them). To be more correct (which you don't have to be), water is most likely has a higher IMF even though it only has 2 hydrogen bonding (due to the fact H-O has a stronger IMF than N-H and H-F is the strongest).
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