Substances and Mixtures

Are you ready for this review, grade 7 students?

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A pure substance is matter that has distinct properties and has no fixed chemical composition. TRUE OR FALSE?

• True

• False

Tags

NGSS.MS-PS1-4

Since a pure substance has a fixed chemical composition, are elements and compounds considered pure substances?

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Tags

NGSS.MS-PS1-1

Which among the following are pure substances? There are three correct answers.

• air

• water

• soil

• sugar

• nitrogen gas

This is a combination of two or more substances that can be separated by physical methods.

The components or ingredients of a mixture can be varied or changed. True or false?

• True

• False

What mixture is being represented by this illustration?

• homogeneous mixture

• heterogeneous mixture

In the next set of questions, identify whether the given mixture is homogeneous or heterogeneous.

Kaya pa ba, grade 7?

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Chocolate chip cookies

• homogeneous mixture

• heterogeneous mixture

Cake batter

• homogeneous mixture

• heterogeneous mixture