Osmosis And Diffusion Lab

Question 1

What is the Law of diffusion ?

Answer 1

Molecules move from area of higher chemical potential to area of lower chemical potential

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(Chemical potential: free energy available = the greater the concentration of dissolved substances the higher is the chemical potential free energy/ mole)

Question 2

What is simple diffusion?

Answer 2

Higher solute concentrations to lower solute concentrations. ( goes down concentration gradient)

Question 3

Factors which affect the speed of diffusion:

Answer 3

1) Temperature : high = high kinetic
energy = move faster = disperse faster
2) molar mas : lighter = faster
Heavy = slower ( graham law )
R1/R2 = [ M2/M1

Question 4

What is osmosis

Answer 4

Type of facilitated diffusion
Movement of water from a lot of water ( low solute ) to not a-lot of water (high solute)
Moves down concentration gradient ( aquaporins)

Question 5

What is a hypertonic solution?

Answer 5

Solution that contains lower water potential ( high solute concentrations.). —> water moves out of the cell ( shrivels)

Question 6

What is a hypotonic solution?

Answer 6

Low solute concentrations ( a lot of water) —> the water comes in the cell due to osmosis (burst)

Question 7

What is a isotonic solution?

Answer 7

Same water potential outside and inside the cell ( same concentration of solute inside and outside the cell )

Question 8

What happens to a plant cell when it is put in a hypotonic solution?

Answer 8

The central vacuole fills up and pushes outwards on the cell wall ( turgor pressure) keeps the cell stiff giving plants rigidity and it does not burst ( like animal cells) because of cell wall

Question 9

What is passive transport and examples.

Answer 9

Osmosis and diffusion doesn’t require energy because it moves down concentration gradient.

Question 10

What is active transport?

Answer 10

Require energy input to move against concentration gradient.