Colloids

What is a colloid?

• A pure substance
• A mixture with particles that settle at the bottom
• A mixture with particles that are evenly dispersed
• A chemical compound

Which of the following is NOT an example of a colloid?

• Mayonnaise
• Milk
• Sand
• Fog

Colloids can be classified based on the phase of the dispersed particles. Which type consists of liquid droplets dispersed in a liquid?

• Foam
• Emulsion
• Sol
• Gel

What is the Tyndall effect?

• A phenomenon where light scatters when passing through a colloid
• A chemical reaction in colloids
• A way to separate colloids from solutions
• A type of colloid

Which of the following is a common example of a sol?

• Jello
• Orange juice
• Air
• Milk

What type of colloid is formed when gas bubbles are dispersed in a liquid

• Gel
• Sol
• Foam
• Emulsion

Which of the following is a colloid that can also act as an emulsifying agent in salad dressings and sauces?

• Butter
• Vinegar
• Honey
• Soy sauce

What do aerosols consist of?

• Solid particles dispersed in a gas
• Liquid particles dispersed in a gas
• Gas particles dispersed in a gas
• Gas particles dispersed in a liquid

What is an example of a gel colloid?

• Gelatin dessert
• Coffee
• Vinegar
• Blood

How does a suspension differ from a colloid?

• Suspensions are always homogeneous, while colloids are not.
• Suspensions have larger particles that settle, while colloids have smaller particles that do not settle.
• Suspensions have gas dispersed in a liquid, while colloids have liquid dispersed in a gas.
• Suspensions do not scatter light, while colloids do.