Unit 2 chapter 3 Test REVIEW

Front

What happens when two solids are mixed together?

Back

They may form a heterogeneous mixture or a homogeneous solution, depending on their properties.

Front

What is lecithin used for in salad dressing?

Back

To emulsify ingredients and create a stable mixture.

Front

Why do scientists need to make inferences?

Back

To draw conclusions based on observations and evidence.

Front

What is the process where different substances in a mixture become distinct layers over time?

Back

Separation.

Front

Did scientists know about atoms and molecules before they saw them?

Back

DISAGREE.

Front

What is a heterogeneous mixture?

Back

A mixture where the components are not uniformly distributed.

Front

What is a homogeneous solution?

Back

A mixture where the components are uniformly distributed and cannot be easily distinguished.

Front

What is an example of an emulsifier?

Back

Lecithin.

Front

What is the role of observations in scientific experiments?

Back

To gather data that can lead to conclusions.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of substances that retain their individual properties, while a compound is a substance formed when two or more elements chemically bond.