Final answer:
Colloids are distinguished by their particle size (2-500 nm), being heterogeneous mixtures that appear homogenous, their stability as particles do not settle, and their ability to pass through filters due to small particle size.
Step-by-step explanation:
Properties of Colloids
Colloids have distinct characteristics that distinguish them from other types of mixtures such as solutions and suspensions. Here are the four properties of colloids based on various criteria:
- Particle size: Colloidal particles range in size from approximately 2 to 500 nm. They are larger than particles found in solutions (less than 2 nm) but smaller than those in suspensions (greater than 500 nm).
- Type of mixture: Colloids are heterogeneous mixtures, meaning the composition is not uniform throughout. However, due to the small size of colloidal particles, they appear homogenous to the nak'd eye.
- Stability: Colloidal mixtures are quite stable and the particles do not settle out upon standing, unlike suspensions. This is due to the small size and the Brownian motion of the particles.
- Filterability: Colloidal particles are small enough to pass through filter paper. This is in contrast with suspensions whose larger particles would be retained by the filter.
These properties make colloids distinctive in their behavior and usefulness in various applications ranging from industrial processes to everyday products.