Osmosis and Energy Concepts
Explanation of Osmosis
Osmosis is defined as the movement of water molecules across a partially permeable membrane from a less concentrated solution to a more concentrated solution. This process continues until the concentration on both sides of the membrane becomes equal.
Definition: Osmosis is the diffusion of water across a cell membrane.
The document explains that in osmosis:
- Only small molecules like water can pass through the membrane
- Water molecules move from areas of high concentration to low concentration
- The more concentrated solution has fewer water molecules per solute
Highlight: The overall movement of water molecules is from the less concentrated solution to the more concentrated solution.
Vocabulary: Partially permeable membrane - A membrane with small holes that allows only certain molecules to pass through.
Osmosis Potato Experiment
The document outlines a practical experiment to observe the effect of sugar solution on plant tissue using potato cylinders. The procedure involves:
- Cutting potato cylinders of equal size
- Preparing beakers with pure water and concentrated sugar solution
- Measuring the initial mass of potato cylinders
- Placing potato cylinders in different solutions for 24 hours
- Measuring the final mass and calculating the percentage change
Example: If the potato's mass increases, water has moved into the potato cells. If the mass decreases, water has moved out of the potato.
This osmosis potato experiment procedure helps students visualize and understand the concept of osmosis in plant cells.
