Unique Properties of water. Pages 24 - 26. Polar molecule. A molecule with opposite charges on different ends A molecule with a charge distribution. Electronegativity. The tendency for an atom to pull electrons toward itself
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The tendency for an atom to pull electrons toward itself
Oxygen is more electronegative than hydrogen, so the electrons spend more of their time closer to the oxygen atom giving it a slight negative charge and leaving the hydrogens with slight positive charges
When sweat evaporates from the skin, the water molecules that transition from liquid sweat to gaseous water vapor are the fastest moving molecules. As they shift phases it takes lots of energy and heat is given off. The water that remains is slower moving and much cooler. This results in lowering the body temperature.