Osmosis Flashcards
(10 cards)
What is osmosis?
The diffusion of water molecules from a dilute solution to a concentrated solution across a partially-permeable membrane.
Osmosis occurs when solutions of different concentrations are separated by a membrane that allows water to pass but not solutes.
What type of membrane is involved in osmosis?
Partially-permeable membrane.
This type of membrane allows only certain molecules, like water, to diffuse through.
What happens to water molecules during osmosis?
Water molecules move from the dilute solution to the concentrated solution.
A dilute solution has more water molecules than a concentrated solution.
In plants, where does water move from during osmosis?
From the soil into the root-hair cells.
Soil water is more dilute than the solution in the cells.
What can happen to animal cells if too much water enters through osmosis?
The animal cell can burst.
Unlike plant cells, animal cells do not have cell walls to protect them.
What is the first step in the required practical for osmosis?
Cut 5 potatoes into cylinders of the same diameter.
This ensures uniformity in the experiment.
What should be done after cutting the potato cylinders?
Accurately measure and record the length and mass of each potato cylinder.
This initial measurement is crucial for comparing changes after the osmosis experiment.
What is the concentration of the sugar solution used in the first boiling tube?
0.25 M sugar solution.
Different concentrations of sugar solutions are used in subsequent boiling tubes.
How should the potato cylinders be treated after being placed in the boiling tubes overnight?
Remove the cylinders from the boiling tubes and carefully dry them with paper towels.
This step is important for accurate re-measurement of length and mass.
What must be done after drying the potato cylinders?
Re-measure the length and mass of each cylinder and record the results in a table.
This allows for analysis of the effects of osmosis on the potato cylinders.
