OCS 1005 Lecture : Lecture 7 Water
15 Mar 2019
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Chapter 6: physical properties of water and sea water. H2o is a remarkable molecule: ex. How remarkable liquid, or gas: only substance to occur at all three states on earth, expands as it freezes: rises. Releases heat: like a heat sponge, high heat capacity, 1 c per molecule, water can take in more heat than land, transparency, fish. Water=polar molecule: hydrogen bonds with oxygens, one of the things that makes water more dense, covalent bonds are hard to break, why water is wet. Surface tension: cohesion: mutual attraction: water drops are round, hydrogen bonds, adhesion: attraction to other molecules=water is wet, use this to talk about porous soil. Oil has no charge: will spread over water surface. All because of evaporation and perception: takes a lot of heat to move between phases, water can pull heat out of your body during evaporation.
