BIL 150 Chapter 3: 1 Chapter 3 Notes
28 Apr 2016
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Oxygen is more electronegative than hydrogen so the e- of covalent bonds spend more time closer to oxygen (polar covalent bonds: polar molecule. Hydrogen bonds hold the substance together (cohesion) Water has unusually high surface tension due to all the h+ bonds. Water moderates air temp by absorbing heat from the air and then releasing stored air that is cooler. Temperature is a measure of energy that represents average kinetic energy of molecules in a body of mass. Total thermal energy depends in part of the matter"s volume. Heat = thermal energy in transfer from one body to another. Water high specific heat because heat absorbed is used to disrupt hydrogen bonds first before water molecules can begin moving faster: can absorb lots of heat in summer while only heating up a little. As liquid evaporates, surface of liquid left behind cools down: evaporative cooling. Occurs because hottest molecules are ones to leave first so ones left behind are cooler.
