why does oil not mix with water?..is it coz of different nature of liquids or coz of a difference in density?

Answer 1

The water molecule is made up of two hydrogen atoms and one oxygen atom.
Due to the ability of the oxygen atom to pull the hydrogen electrons
towards itself, it carries a negative charge. As a result, the hydrogen
atoms carry a more positive charge. The charges of these two molecules
allow them to make weak bonds with certain particles, like NaCl. NaCl
dissociates into a Na+ which is attracted to the negative oxygen atoms
of the water molecules and hangs out there, and the Cl- which is
attracted to the positive hydrogen atoms in the water molecules and
hangs out with them. Likewise, molecules which have lots of charges on
them are termed hydrophillic, or "water loving." They interact well
with the charges on water molecules.

Unlike the water molecule, oil is made up of long chains of carbon atoms
(usually 8 Carbon atoms) which do not carry an electric charge. These
long chains without a charge are called hydrophobic - or "afraid of
water." Because they do not have a charge, there is no attraction
between the charges on the water molecule and the long carbon chains and
can't hang out with the water molecules. That is why oil does not mix
with water. It is because it cannot form any bonds with water.

I hope this clears things up for you.

Answer 2

Different natures. Oil is a nonpolar molecule. Water is polar.

Answer 3

The word is BECAUSE, not coz. Coz is slang for cousin. If you can't speak English, yo' is a dead duck in science. It's due to the"different nature" of the liquids, whatever that means.