Chapter 25: Diffusion and Osmosis

Diffusion
 Diffusion  refers to the movement of matter from a region of higher concentration to a region of lower concentration.

Factors that identify diffusion:

• Occurs in all 3 states - solid, liquid and gaseous state.
• Occur in the presence of absence of a partially permeable membrane
• Can occur in all substances

clear water + potassium permanganate ---> potassium permanganate solution

Examples:

1. When copper sulfate crystals are embedded in the a colorless agar-agar, whole agar-agar to turn blue gradually.
2. When someone wear perfume passes by, there will be a nice fragrance coming from the person.
3. When rose syrup is added to plain water, the solution will turn red gradually. 

Osmosis

Similar to diffusion, in osmosis, molecules diffuses from a region of higher concentration to a region of lower concentration.

However, the factors that identify osmosis is very different, these are the factors:

• Occurs in the presence of a partially permeable membrane
• Occurs only at the liquid state
• Involves only water molecules

Example: 

• Filtering rice out of water with a sieve

Active Transport

Active Transport refers to the movement of matter from a region of lower concentration to a region of higher concentration using energy.