What is the Relationship Between Solute Concentration and Osmosis

what was the dependent variable in the sucrose experiment?

the percent change in the mass because it was what was tested for

hypertonic

the solution with a higher concentration of solute

what molecule was responsible for the change in mass in the bags?

the water

were water molecules leaving and entering the cell?

yes; the waters net movement means more water moves in one direction, but water still moves in both directions

hypotonic

having a lower concentration of solute than another solution

what will happen to the rate of a contractile vacuole if placed in 100% water solution? a salt water solution?

rate would increase; rate would decrease

why use the percent change in mass rather than simply using the change in mass

the bags had different masses so the percent change in mass would be a more accurate method of comparison

what is the independent variable in the sucrose experiment?

the concentration of sucrose because it was changed

what is the control in the sucrose experiment?

the control was the distilled water because it shows the absence of the experimental factor - sucrose

explain the relationship between the concentration of the sucrose solution and the percent change in mass

the higher the concentration of sucrose the greater the mass change

percent change formula

(final mass-initial mass)/initial mass x100%

calculate the percent change of mass if the initial mass is 20g and the final is 18g

10%

isotonic

having a solute concentration equal to that of another solution

predict what would happen to the mass of each bag in the sucrose experiment if all the bags were place in a .4 M sucrose solution instead of distilled water

the mass of the 0 and .2 M sucrose solutions would decrease; the .4 would stay the same, and the .6, .8, and 1 M masses would increase