BIOL 1201 Lecture : Lecture 4 Fall 2012
Document Summary
Readings: pgs 46-63 in campbell biology 9th ed. Mastering biology: on-line homework 1, 2 (due 10 am, before class) Biological importance: living cells are 70%-95% water, solvent for biological reactions (aqueous solutions, 71% of earth"s surface is covered by water. Oxygen more electron negative than hydrogen, so the electrons spend more time closer to oxygen than hydrogen. Unequal sharing of electrons and molecule"s v- like shape. ^makes water more structured than most other liquids. Some important properties of h2o: high specific heat(amount of heat that must be absorbed or lost for 1 g of substance to change its temp by 1 oc) *stabilizes temperatures: high heat of vaporization(quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state) As a liquid evaporates, the surface of the liquied that remains behind cools down.
