B1- Osmosis Flashcards
What is osmosis?
The movement of water molecules across a partially permeable membrane from a region of higher water concentration to a region of lower water concentration.
What is a partially permeable membrane?
A membrane with very small holes that allows only tiny molecules (like water) to pass through while blocking larger molecules (like sucrose).
True or False: In osmosis, water molecules only move in one direction across the membrane.
False
What drives the net flow of water during osmosis?
The difference in the number of water molecules on either side of the membrane.
What happens to a strong sugar solution during osmosis?
It becomes more dilute as water moves into it from a region of higher concentration.
Osmosis is a type of _______.
diffusion
What is the first step in the osmosis experiment using potato cylinders?
Cut up a potato into identical cylinders and place them in beakers with different sugar solutions.
What should one beaker contain in the osmosis experiment?
Pure water
What is the dependent variable in the osmosis experiment?
The chip mass
What is the independent variable in the osmosis experiment?
The concentration of the sugar solution
Fill in the blank: To ensure a fair test in the osmosis experiment, all other variables such as _______ must be kept the same.
volume of solution, temperature, time, type of sugar used
What should be done with the potato cylinders after the osmosis experiment?
Dry them with a paper towel and measure their masses again.
What indicates that water has been drawn in by osmosis in the experiment?
An increase in mass of the potato cylinders.
What indicates that water has been drawn out by osmosis in the experiment?
A decrease in mass of the potato cylinders.
What is a potential error in the osmosis experiment?
Potato cylinders not being fully dried or water evaporating from beakers.
