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Study Guide > University of Louisville BIO 240 Chapter 3: Water and Lif
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University of Louisville BIO 240 Chapter 3: Water and Life • Allows life to exist in solid, liquid or gaseous form • Polar molecule with hydrogen bonds creating unique properties • Cohesion:... water’s ability to stick to itself - hydrogen bonds allow for this to occur - has a lot of surface tension: difficulty to stretch and break the surface -adhesion: water’s ability to stick to other molecules • Temperature: - water controls air temp. by absorbing heat and releasing cool air or vice versa - Kinetic energy: anything that more - Heat: total kinetic energy due to motion based upon volume (absolute) - Temperature: average kinetic energy regardless of volume (relative) - calorie: amount of heat required to raise the temperature of 1 g of water by 1˚C - water has a high specific heat: amount of heat that must be absorbed to change the temperature of 1 g of water by 1˚C - water can absorb a lot of heat before the temp. changes • Evaporative Cooling: - water has a high heat of vaporization: amount of heath a liquid must absorb for 1g to change to vapor (due to hydrogen bonds) *helps moderate climate and body temperature (sweating) • Floating Ice: - ice is less dense than water, that’s why it floats to the top of lakes - water expands when it freezes and obtains max. H bonds • Solvent of Life - solution: fluid with a dissolvent in it - solvent: dissolving agent - solute: dissolved substance (what is dissolved) - aqueous solution: when water is the solvent - hydrogen shell: water sphere around dissolves ions • Hydrophobic: substances that repel water • Hydrophilic: substances that dissolve in water • Colloid: stable suspension of fine particles in a liquid • Solute Concentration [Show More]
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