Chemistry questions. PLEASE HELP!

Question

Give two characteristics of the water molecule that would not occur if it was not a polar molecule?

Explain why the relative humidity changes throughout the day if the water vapor content does not change.

Explain the Adiabatic Heating and Cooling? Where do we see examples of both in the world?

If you can help me answer any of these, it'd be really super helpful. I'm so lost.

Answer 1

1.  When you put water on a non-polar surface it beads up.  If it were non-polar it would not bead up.

Answer 2

Because of the polarity of the water molecule, the hydrogen bonds are possible and therefore the insual high boiling point,

Without polarity it wouldn't disolve most salts

the relative humidity is function of the temperature and the vapor content in the air, as the vapor keeps constant but the temperature changes the relative humidity also changes

Answer 3

Water wouldn't be able to dissolve salts and water wouldn't be able to induce protein folding. Also, due to the polarity of water, it has a relative low boiling temperature and is able to form hydrogen bonds.

The relative humidity is the percentage of water per volume of air relative to the maximum or saturated contents of water per volume of air. This is dependant on the temperature. So while the contents of water per volume of air stays the same during the day, because of the temperature differences, the relative humidity does change.

Adiabatic heating or cooling is heating or cooling without and external power source or sink.

Example 1: When you spray with a aerosoil can, it gets cold without the surroundings cooling the can.

Example 2: When an explosion occurs, the explosion itselfs gets extremely hot, without any energy invested from other sources.