Chemistry Hw, Please Help?

Question

For the following bonds, which direction is the bond dipole and which end of the bond is positive and negative?

1.) P-O

2.) P-H

Answer 1

You always want to think in terms of electronegativity. Since Oxygen is more electroneg. than P, the P end will be slightly positive, so the dipole moment will be going from P +---> O.

For the other bond, it's the opposite because Hydrogen is not that electroneg.

Answer 2

Just look at electronegativity trends on the periodic table. The higher it is and the further to the right it is, the greater the electronegativity is (generally - there are a couple of exceptions but for nonmetals, most transition metals, alkali metals, and alkali earth metals it holds true fairly well). If an element is higher than another that is further to the right, then it has a higher electronegativity. If an element is further to the right than another element, it has a higher electronegativity.

Hydrogen ions will be the positive ends of bonds, though since a hydrogen ion is a proton.

Answer 3

This is just me guessing since I don't have the electronegativity table thing anywhere near me:

p is positive and o is negative

p is negative and 0 is positive

I dunno if thats right but if you have a electronegativity table or maybe if you find one on the net it'll help you

The one with the highest electronegativity out of the pair is the negative one