RPAs

Question 1

Independent variable in osmosis RPA

Answer 1

Concentration of sugar solution

Question 2

Dependant variable in osmosis RPA

Answer 2

Change in mass of potato pieces

Question 3

Control variable for osmosis RPA

Answer 3

Time left out for
Temperature and volume of solutions

Question 4

Osmosis

Answer 4

The movement of water molecules from a more concentrated region to a more dilute region across a partially permeable membrane

Question 5

What happens if the sugar solution has more water molecules than the potato piece?

Answer 5

The potato piece will increase in mass because it is more dilute inside and water molecules move across a partially permeable membrane into the potato piece

Question 6

Why is the potato skin cut off?

Answer 6

It is a permeable membrane which does not let in the water molecules from

Question 7

What happens to the mass of the potato when put in distilled water?

Answer 7

Increases
Higher water concentration on the outside

Question 8

How to determine amount of water in the cells chloroplasts

Answer 8

When the line of best fit crosses the x-axis

Question 9

Method for osmosis RPA

Answer 9

My method:

I -Cut 6 potato cylinders , with no skin. of the same size and length measured with ruler.
sucrose with distilled water
2 -Measure and record each potato cylinder’s mass using a top-par talarce.
3 - Put each potato piece into a boiling tube
4-Put I piece into a tube with 10cm3 of distilled water to compare to other solutions.
5- Put a different suger solution with a different concertation into each boiling tube
6- Put in the same place for up to 24 hours to remove excess
7- After, blot the potato pieces dry on a cloth and measure and record mass
8- Determine percentage change = change in mass/initial mass x 100
9- Repeat multiple times to idertiguinitial mass (g) aromalies and calculate a mean.