BIO SCI 93 Lecture Notes - Lecture 3: Cellulose, Heat Capacity, Coffeemaker
9 Nov 2016
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BIO SCI 93 Full Course Notes
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Chapter 3: 3. 1 polar covalent bonds in water molecules. Polar molecule: the overall charge of the molecule is unevenly distributed. Cohesion: the hydrogen bonds hold the substance together. Adhesion: clinging of one substance to another. Helps water stick to cell walls and resist gravity. Surface tension: a measure of how difficult it is to stretch or break the surface of a liquid. Results from the collective strength of its hydrogen bonds. Can absorb or release a relatively large amount of water without drastically changing its own temperature. The faster a molecule moves, the higher its kinetic energy. Thermal energy: energy in its most random form, depends on volume. Water in a swimming pool has a higher amount of thermal energy than water in a coffeemaker due to greater volume. Temperature: measure of energy that represents the average kinetic energy of the molecules in a body of matter, regardless of volume. But water in a coffeemaker is hotter, therefore higher temperature.
