What is the main difference between a mixture and a pure substance?

A mixture is made of two or more pure substances, while a pure substance cannot be separated into other materials by physical processes.

Explain how you could separate salt water into its individual components.

Boil the salt water. The water will evaporate, leaving the salt behind.

A homogeneous mixture has substances evenly distributed throughout, while a heterogeneous mixture does not.

5th GradeScience50 min

I can differentiate between mixtures and solutions.

5 min

Types of Matter: Elements, Compounds, and Mixtures

Professor Dave Explains

10 min

Key concepts students will learn:

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Matter can exist in three phases: solid, liquid, and gas.
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A physical change does not change the chemical composition of a substance, while a chemical change does.
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A mixture is made of two or more pure substances that can be separated by physical processes, and can be either homogeneous or heterogeneous.

15 min

12 questions • Multiple choice & Short answer

5 min

“Explain the key difference between a mixture and a solution, providing an example of each.”

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