Appearance of Colloids

1. Which of the following is NOT an appearance of a colloid?

• Clear

• Cloudy

• Colored

• Hard

2. Why do colloids often appear cloudy or translucent?

• Because the particles in a colloid are very small and scatter light.

• Because the particles in a colloid are electrically charged and repel each other.

• Because the particles in a colloid are made of different materials.

• All of the above

3. Which of the following is the best way to describe the appearance of milk?

• Clear and colorless

• Cloudy and white

• Translucent and blue

• Opaque and brown

4. Why does milk appear more cloudy when it is skimmed?

• Because skimmed milk has more fat droplets.

• Because skimmed milk has fewer fat droplets.

• Because skimmed milk has a different pH.

• None of the above

5. Which of the following colloids is the most likely to have a strong Tyndall effect?

• Milk

• Mayonnaise

• Smoke

• All of the above