Question

Question #a2545

Answer 1

see below

Explanation:

This is non an easy question. I can give you a start of answer. Polarity of a molecule is given by the difference of electronegativity between the atoms that forms it and by the geometrical structure of the molecula for those that are more than biatomic.

For example a molecule of Oxygen is non polar because there is no different electronegativity between the two oxygen atoms, while a molecule of HCl is polar because there is a different electronegativity between the atoms of Hydrogen (2,1) and of Clorine (3,0). There is a partial negative charge on the atom of clorine and a positive one on the atom of Hydrogen.

carbon dioxide is non polar because is structure is linear O=C=O and the two polarities of the C=O bonds compensate themselves for simmetry.
Water is a polar molecule because the bond angle between the two O-H bond is 104° .There is a partial negative charge on the atom of oxygen and a positive one in the middle of the two atoms of Hydrogen.

`BF_3` is a planar molecula with three bonds at 120° and it is not polar for simmetry, while `NH_3` has a tetraedric spatial disposition and is a polar molecula. `CCl_4` has a tetraedric spatial disposition and is not a polar molecula, while CHCl_3 is polar