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chapter 2 vocab
vocabulary
22
Biology
Undergraduate 1
02/01/2009

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Term
Acid
Definition
a substance that increases the hydrogen ion concentration of a solution
Term
Adhesion
Definition
the attraction between different kinds of molecules
Term
Base
Definition
– a substance that reduces the hydrogen ion concentration of a solution
Term
Buffers
Definition
- a substance that consists of acid and base forms in a solution and that minimizes changes in pH when extraneous acids or bases are added to the solution
Term
Calorie
Definition
- the amount of heat energy required to raise the temperature of 1g of water by 1 degree C; also the amount of heat energy that 1 g of water releases when it cools by 1 degree C.
Term
Capillary action
Definition
- cohesion working with adhesion facilitates the transport of water against gravity in plants through vesicles in tissue called the xylem
Term
Cohesion
Definition
- the binding together of like molecules, often by hydrogen bonds
Term
Evaporation
Definition
- the removal of heat energy from the surface of a liquid that is losing some of its molecules
Term
Evaporative cooling
Definition
- the property of a liquid whereby the surface becomes cooler during evaporation, owing to a loss of the molecules with the greatest kinetic energy to the gaseous state
Term
Heat of vaporization
Definition
- the quantity of heat a liquid must absorb for 1g of it to be converted from the liquid to the gaseous state (expressed in the form of a calorie)
Term
Hydration shell
Definition
- the sphere of water molecules around each dissolved ion
Term
Hydronium ion
Definition
- a water molecule that has an extra proton bound to it, H3O+
Term
Hydrophilic
Definition
- having an affinity for water
Term
Hydrophobic
Definition
- having an aversion to water; tending to coalesce and form droplets in water
Term
Hydroxide ion
Definition
- a water molecule that has lost a proton, OH-
Term
pH
Definition
- a measure of hydrogen ion concentration equal to –log[H+] and ranging in value from 0 to 14
Term
Solute
Definition
- a substance that is dissolved in a solution
Term
Solution
Definition
- a liquid that is a homogeneous mixture of 2 or more substances
Term
Solvent
Definition
- the dissolving agent of a solution. Water is the most versatile solvent known.
Term
Specific heat
Definition
– the amount of heat that must be absorbed or lost for 1g of a substance to change its temperature by 1 degree C (expressed in form of calorie)
Term
Surface tension
Definition
- a measure of how difficult it is to stretch of break the surface of a liquid. Water has a high surface tension because of the hydrogen bonding of surface molecules
Term
Xylem
Definition
- vascular plant tissue consisting mainly of tubular dead cells that conduct most of the water and minerals upward from the roots to the rest of the plant.
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