Osmosis Flashcards
After a period of time, the level of concentrated sugar solutions changes. Why?
Water enters into sugar solution
Membrane is partially permeable
Water moves in by osmosis
Because concentration of sugar is greater inside than out
The student uses more dilute sugar solution. Why was the results different?
It’ rises more slowly
Due to less differences in concentration
Explain why plant cells get swollen.
Water enters cells through a partial permeable membrane
By osmosis
What does turgid and flaccid mean
Turgid means swollen
Flaccid means shrinkn
A piece of potato is peeled in concentrated solution. Describe the change which will occur and why?
Potato shrinks
As water moves it of cell by osmosis
Concentration of sugar is higher outside
What is the rp practical for osmosis.
Peel potato
Use cork borer to make equal cylinders
Use scalpel to trim cylinders to same length
Use ruler to measure length of cylinder
Use balance to measure mass
Place into test tube with concentrations of sugar and add water
Wait overnight
Dry potatoes with towel
Measure length again
Calculate percentage change
What is the independent variable?
Size of potato
What is the dependent variable ?
Mass or length
What is the control variable?
Potato
What happens when water moves in and out of cells?
In, cells expands and burst
Out, shrinks and flaccid
Explain how diabetes cause the body to lose more water.
The blood is more concentrated than the solution within body cells
Water moves out of cells by osmosis
Through a partially permeable membrane
Why should you dry the potato?
To remove water from outside the potato
