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Unformatted text preview: e e e 6P 6N e e e Christine Karavas Lab Quiz 1 Review Lab 1: I ntroductory Investigations Three states of matter; density- Three states of matter: solid, liquid, gas. Usually solid matter is the most dense and gaseous matter is the least dense. Water, however, is an exception. - Density is mass per unit of volume of a substance. Relative densities of water at different temperatures; densities of liquid and solid water Cold (liquid) water is more dense than warm (liquid) water. However, solid water (ice) is less dense than liquid water (of any temperature,) so it floats. (Top) Ice (coldest water) Warmer liquid water (Botto m) Colder liquid water What is the significance of the cooling and heating properties of water to living systems?- Ice is a spacious crystal. Hydrogen bonds in liquid water are short lived, but hydrogen bonds in solid ice last longer. (each molecule is bonded to four neighbor molecules.) Floating ice preserves bodies of water by insulating liquid water below and allowing life to persist under the frozen surface.- Water moderates temperature. Heat energy absorbed by water molecules is first used to disrupt hydrogen bonds and then to make water molecules move faster (which makes the temperature rise.) Water absorbs and stores a large amount of heat while warming up only a few degrees in temperature. Earths large water supply keeps temperatures withing limits that permit life, by storing heat from the sun during warm periods and by giving off heat to...
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This note was uploaded on 11/01/2010 for the course BIO 110 taught by Professor Drazkiewicz during the Fall '09 term at San Mateo Colleges.
- Fall '09