Understanding Mixtures in Chemistry

What role do condiments like ketchup, mustard, and mayonnaise play in understanding chemistry?

• They help illustrate the concept of mixtures.

• They are used to demonstrate chemical reactions.

• They are examples of pure substances.

• They are examples of elements.

What type of mixture is a suspension?

• A homogeneous mixture

• A mixture of gases

• A heterogeneous mixture

• A mixture of elements

Which condiment is an example of a suspension?

• Ketchup

• Olive oil

• Mayonnaise

• Vinegar

What is a colloidal dispersion?

• A mixture of two solids

• A mixture with small particles evenly distributed

• A homogeneous mixture

• A mixture of two gases

Why do oil and water tend to separate?

• Oil is denser than water.

• Oil is magnetic.

• Water is nonpolar.

• Oil is hydrophobic and water is polar.

What is the main reason oil droplets in water form a separate layer?

• Oil is lighter than water.

• Oil molecules are nonpolar.

• Water molecules are nonpolar.

• Oil is heavier than water.

What is the role of lecithin in making mayonnaise?

• It acts as a preservative.

• It provides flavor.

• It acts as an emulsifier.

• It adds color.

How does lecithin stabilize oil droplets in mayonnaise?

• By dissolving them completely

• By coating them with a hydrophobic and hydrophilic layer

• By making them hydrophilic

• By making them heavier

What happens to oil droplets when they are coated with lecithin?

• They evaporate.

• They remain suspended in water.

• They dissolve in water.

• They become larger.

What is the result of mixing oil and vinegar with lecithin?

• A stable suspension

• A stable emulsion

• A homogeneous solution

• A solid compound