Bio Lab 5

Front 1

if the temperature is above absolute zero (-273 C), molecules of all substances exhibit?

Back 1

a constant random motion

Front 2

random movement of microscopic particles caused by collisions with molecules of the surrounding medium

Back 2

Brownian movement

Front 3

the constant movement of molecules is also a cause of?

Back 3

diffusion, osmosis, and dialysis

Front 4

molecules move from a region of greater molecular activity to a region of lesser activity

Back 4

diffusion

Front 5

high viscosity

Back 5

decreases diffusion

Front 6

high molecular weight

Back 6

decreases diffusion

Front 7

high concentration

Back 7

increases diffusion

Front 8

high temperature

Back 8

increases diffusion

Front 9

high pressure

Back 9

increases diffusion

Front 10

amount of one substance in a given quantity of another substance

Back 10

concentration

Front 11

concentration is measured by this; higher values being higher concentration

Back 11

molarity
abbr. M

Front 12

mixture of 2 or more components

Back 12

solution

Front 13

component of a solution that does the dissolving (frequently water)

Back 13

solvent

Front 14

component that is dissolved in the solvent

Back 14

solute

Front 15

movement of a solvent through a semi permeable membrane from a solution with higher concentration of solvent (hypotonic) to a solution with a lower concentration of solvent (hypertonic)

Back 15

osmosis

Front 16

less solute and more solvent than the other side; solvent will leave this solution

ex. distilled water

Back 16

hypotonic

Front 17

more solute and less solvent than the other side; solvent will flow into this solution

ex. salty water

Back 17

hypertonic

Front 18

both sides have equal concentrations of solvent; there will be no net movement of solvent

Back 18

isotonic

Front 19

if cell is placed in a hypertonic solution?

Back 19

it loses water

Front 20

in plant cell the cell will_________ if places in hypertonic solution.
what is this called?

Back 20

-shrivel up in the middle of the cell, with the chloroplasts trapped inside

-plasmolysis

Front 21

if the cell is placed in hypotonic solution?

Back 21

cell will gain water and swell

Front 22

a plasmolyzed cell will then?
-what is this called?

Back 22

-look normal again
-deplasmolysis

Front 23

process by which any substance, solute or solvent, will pass through the pores of a semi permeable membrane as long as the substance is smaller than the pores

Back 23

dialysis

Front 24

absolute zero

Back 24

-273 C

Front 25

example of brownian movement

Back 25

lampblack/detergent solution

Front 26

three states pure chemicals exist

Back 26

gaseous solid lliquid

Front 27

total weight of atoms composing one molecule of a substance

Back 27

molecular weight

Front 28

resistance flow

Back 28

viscosity

Front 29

tested rate of diffusion

Back 29

agar

Front 30

what effect does the molecular weight have to do with diffusion

Back 30

heavier-----slower
lighter------faster

Front 31

observed osmosis in

Back 31

elodea

Front 32

elodea---when NaCl added?

Back 32

got smaller

Front 33

elodea---when distilled water added?

Back 33

get bigger

Front 34

in dialysis experiment w/ phenolphthalein & NaOH---why does pink color form in bag but no in water in beaker?

Back 34

hydroxide is small enough to enter

Front 35

in experiment w/ starch and iodine---why does blue color form in water but not bag?

Back 35

starch too big to enter bag
iodine small enough to leave bag