[AP BIOLOGY] CHAPTER 3 _ WATER & LIFE
Terms in this set (30)
Greater electronegativity than Hydrogen, so electrons are closer to Oxygen atom in H20 molecules
Shaped like a wide 'V'
Stick to one another because of hydrogen bonding - Cohesion.
Clinging of one substance to another. (ex. H20 clings to the walls of plant vessels.)
The energy of motion
The measure of the total quantity of kinetic energy due to molecular motion.
Measures the intensity of heat due to the average kinetic energy of the molecules.
The amount of heat energy it takes to raise 1g of H20 by 1º C.
The amount of heat that must be absorbed or lost for 1g of that substance to change its temperature by 1º C.
Heat of Vaporization
The quantity of heat a liquid must absorb for 1g of it to be converted from the liquid to the gaseous state.
Water - High
Occurs because the molecules with the greatest kinetic energy are likely to leave as gas.
Less dense as a solid than as a liquid.
Homogeneous mixture of two or more substances.
Substance that is dissolved
Water is the solvent
Water loving (does not necessarily dissolve)
Water fearing (molecules that are non-polar and non-ionic)
The molecular weight of a substance in grams.
The sum of the weights of all atoms in a molecule.
A mole of any substance has ___________ molecules.
6.02 x 10^23
Hydrogen atom shared by 2 H20 molecules shifts from 1 molecule to another, the hydrogen atom leaves an electron behind a becomes (+) charged.
The H20 molecule that has lost the proton becomes (-) charged
When the H proton binds to another H20 molecule.
Substance that increases the hydrogen ion concentration of a solution.
Substance that reduces the hydrogen ion concentration of a solution.
0 - 14
Minimize change in pH concentration in a solution.
Contain a weak acid and a corresponding base.
Accept hydrogen ions when they are in excess and donate hydrogen ions when they are depleted.