How do you determine if a molecule is polar or non-polar

You would determine if a molecule is polar or non-polar by Mainlydissolving it in water – or any other polar solvent

Explanation:

Polar molecules will dissolve in water while non-polar will not.

This is because polar molecules have dipoles ( partially positive and partially negative ends in the molecule). This means it can interact positively by forming hydrogen bonds with water (hydrophilic), or weak electrostatic forces with molecules of any other polar solvent, Non-polar molecules do not bear this property and are hydrophobic.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.