BIOL 1201 : Biol1201Exam1notes
Document Summary
Maintain fluid and plant temperature at 0 c. Induce freezing in the central fluid at the highest possible subzero temperature. Prevents supercooling and explosive freezing which would damage cells. Freeze-tolerant organisms seed ice formation to control the rate of ice formation. The change of a substance from solid to liquid and the temperature of the melting point. Unusual properties of water: high heat capacity, high heat of vaporization, high heat of fusion, water is most dense at 4 c, because of the hydrogen bonding structure ice is lighter than water. Lakes do not freeze from the bottom up. Polar molecules have partial positive and negative charges due to sharing. Equal sharing of electron pairs in a covalent bond. Polar covalent bond: capillary action and surface tension. Insects can walk on water because they are not dense. This is due to hydrogen bonding: ionization a dissociation into acid (hydronium ion, and base (hydroxyl ion)
