Describe the importance of water being a polar molecule.

Because of water's polarity it can dissolve other polar substances very easily. Basically, when a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa. This attraction causes the the molecules of the other substance to mix with the water.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%