10/16/11 UH III
Biology Textbook- Chapter 3-Water and the Fitness of the Environment (pages 41-51)
POLAR-The opposite ends of the molecule have opposite charges **attraction between polar molecules
**hydrogen bonding orders molecules into structural organization
Non-Polar-Substances that are hydrophobic/water fearing. They do not dissolve well and cannot bond. They share electrons perfectly, therefore have no difference in charge. Ex: oil, gum, wax, sand, plastic.
Adhesion-Something’s ability to stick to other molecules
Cohesion- The ability of the molecules to bond to themselves. (hydrogen sticks to the oxygen) Ex: penny test
Surface Tension-A measure of how difficult it is to break or stretch the surface of liquid. Water has a greater surface tension of most liquids
Vector-Transporter, “in transit” water is a vector for diseases
Cholera-parasite/deadly. Caused by a bacteria called Vibrio
(vomiting and diarrhea at the same time, majority of the people die in 7 days, rapid dehydration)
Hydrogen Bonds-Between molecules, NOT atoms, also the reason why water has a high/strong surface tension.
Heat of Vaporization-the quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state.
Evaporative Cooling- The faster molecules escape and become a gas and the slower/cooler molecules left behind, causing a cooling effect.
Specific Heat- A measurement of how well a substance resists changing its temp when absorbs or releases heat.
Heat-the measure of the total quantity of kinetic energy due to molecular motion in a body of matter.
Temperature- the measure of the intensity of heat due to the average kinetic energy of the molecules.