Ap Biology Chapter 3

Front 1

definition of "polar molecule"

Back 1

the two ends of the molecule have opposite charges

Front 2

cohesion

Back 2

when hydrogen bonds hold a substance together

Front 3

adhesion

Back 3

the clinging of one substance to another

Front 4

surface tension

Back 4

measure of how difficult it is to strech or break the surface of a liquid

Front 5

kinetic energy

Back 5

the energy of motion

Front 6

temperature

Back 6

a measure of heat intesnity that represents the average kinetic energy of the molecules, regardless of volume

Front 7

calorie

Back 7

the amount of heat it takes to raise the temperature of 1 g of water by 1 degree C.

Front 8

specific heat

Back 8

the amount of heat that must be absorbed or loast for 1 g of that substance to change its temperature by 1 c.

Front 9

heat of vaporisation

Back 9

the quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous state.

Front 10

evaporative cooling

Back 10

when liquid evaporates, the surface of the liquid that remains behind cools down.

Front 11

solution

Back 11

a liquid that is a completely homogeneous mixture of two or more substances

Front 12

solvent

Back 12

the dissolving agent of a solution

Front 13

solute

Back 13

the substance that is dissolved is the solute

Front 14

aqueous solution

Back 14

where water is the solvent

Front 15

hydration shell

Back 15

the sphere of water molecules around each dissolved ion

Front 16

hydrophilic

Back 16

a substance that has affinity for water

Front 17

colloid

Back 17

a stable suspension of fine particles in a liquid, because some molecules in cells are so large they don't dissolve

Front 18

hydrophobic

Back 18

a substance that repels water

Front 19

molecular mass

Back 19

the sum of the masses of all the atoms in the molecule