Learn on PengiAmplify Science (California) Grade 5Chapter 1: Why did the food coloring separate into different dyes?

Session 2: What is a Mixture?

Key Idea.

Section 1

Pure vs. Mixed

Key Idea

We know that a pure substance is made of only one kind of molecule. But most things in the world are not pure; they are combinations of different things.

When two or more different substances are combined, they form a mixture. Think of a bag of trail mix with nuts and raisins. The nuts and raisins are in the same bag, but they are still separate items. In a chemical mixture, different types of molecules share the same space, but they stay separate and do not turn into something new.

Section 2

Keeping Their Identity

Key Idea

In a mixture, the molecules act like polite neighbors. They are close together, but they keep to themselves. This means they keep their own properties.

For example, if you mix sugar into water, the sugar molecules are still sugar, and the water molecules are still water. That is why the water tastes sweet. The sugar molecules didn't disappear or change; they just floated in between the water molecules. This allows the individual substances to keep their original characteristics.

Lesson overview

Expand to review the lesson summary and core properties.

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Section 1

Pure vs. Mixed

Key Idea

We know that a pure substance is made of only one kind of molecule. But most things in the world are not pure; they are combinations of different things.

When two or more different substances are combined, they form a mixture. Think of a bag of trail mix with nuts and raisins. The nuts and raisins are in the same bag, but they are still separate items. In a chemical mixture, different types of molecules share the same space, but they stay separate and do not turn into something new.

Section 2

Keeping Their Identity

Key Idea

In a mixture, the molecules act like polite neighbors. They are close together, but they keep to themselves. This means they keep their own properties.

For example, if you mix sugar into water, the sugar molecules are still sugar, and the water molecules are still water. That is why the water tastes sweet. The sugar molecules didn't disappear or change; they just floated in between the water molecules. This allows the individual substances to keep their original characteristics.