Lesson 2- Osmosis and Diffusion

Question 1

Diffusion

Answer 1

passive directional movement of molecules FROM high to low concentrations, heat or pressure

Question 2

heat

Answer 2

random motion of molecules

Question 3

brownian motion

Answer 3

when the resulting particle vibrates after a small solvent particle hits it

Question 4

brownian motion and diffusion (ice cube)

Answer 4

ice cube in tea, the sugar moves up and it become a homogenous solution

Question 5

rate of diffusion depends on

Answer 5

concentration
size of molecules
temp of solution
density of solvent

Question 6

differentially permeable

Answer 6

when ions cannot go inside but non polar molecules can

Question 7

osmosis

Answer 7

diffusion of water across a differentially permeable membrane

Question 8

solvent

Answer 8

the substance in larger concentration

Question 9

why does osmosis occur

Answer 9

because water likes being around polar molecules

Question 10

hypertonic

Answer 10

has more solute concentration

Question 11

isotonic

Answer 11

Same solute concentration

Question 12

turgor pressure

Answer 12

Turgor pressure is the force within the cell that pushes the vacuole and membrane against the cell wall.

Question 13

Plasmolysis

Answer 13

Plasmolysis is the process in which cells lose water in a hypertonic solution.

Question 14

hemolysis

Answer 14

rupturing of blood cells when they are placed into a hypotonic solution

Question 15

figure statements

Answer 15

1) give the graph a title that describes what you are measuring and what process (should be different than axis and tell you about experiment
2) write a few sentences on the instruments used/ samples that you are measuring ex bag A contains 2 percent sucrose solution

Question 16

does particle movement change with heat

Answer 16

heat increases the motion and more collisions occur

Question 17

molecular weight and diffusion

Answer 17

less weight should diffuse faster and further

Question 18

small molecules

Answer 18

sodium ion, hydroxyl ion and iodine pass through the semipermeable membrane because they are smaller moleculesq

Question 19

osmosis requires

Answer 19

a steep free energy gradient

Question 20

what caused the curves for bags in osmosis to become horizontal

Answer 20

increased pressure in the bag

Question 21

how to find concentration of solute in cell based on microscope

Answer 21

if the cells don’t lyse, it is that concentration, on graph, the line would be horizontal

Question 22

permeability of cell membrane

Answer 22

very permeable to water

Question 23

what causes plants steps to be crisp

Answer 23

turgor pressure due to adequate water in cells

Question 24

how do cells stop lysis

Answer 24

they have rigid cell walls

Question 25

how is data statistically significant

Answer 25

if the 95% confidence intervals don’t overlap

Question 26

_________ are molecules like enzymes and self splicing RNA.

Answer 26

biological catalysts

Question 27

Brownian motion explains diffusion;

Answer 27

molecules hit each other until they become evenly distributed

Question 28

rate of diffusion depends on

Answer 28

• concentration
• size
• temperature
• density