Colloids

The video tutorial explains the differences between solutions, colloids, and suspensions based on their particle sizes. Solutions are homogeneous systems with small particles, while suspensions have larger particles that settle over time. Colloids are intermediate, with fine particles dispersed in a medium, exhibiting unique properties due to their large surface area. The tutorial highlights the importance of particle size in determining the characteristics of these mixtures.

What type of system is a sugar solution considered to be?

• Suspension

• Colloidal

• Homogeneous

• Heterogeneous

Which of the following best describes a colloid?

• A suspension that settles over time

• A solution with large molecules

• A homogeneous mixture of ions

• A heterogeneous system with fine particles dispersed in a medium

What is the typical particle size range for colloids?

• Less than 10^-7 cm

• 10^-4 to 10^-7 cm

• Exactly 10^-5 cm

• Greater than 10^-4 cm

In which type of mixture are the particles larger than 10^-4 cm?

• Emulsion

• Suspension

• Colloid

• Solution

What property of colloidal particles is due to their smaller size?

• They settle quickly

• They have a large surface area per unit mass

• They are invisible

• They form crystals