7.PS1.3 Passage with Questions

What happens when two pure substances do not interact chemically?

• They form a mixture

• They form a new substance

• They change their chemical properties

• They lose their physical properties

What is a characteristic of a mixture?

• Each component retains its physical properties

• Components lose their chemical properties

• A new substance is formed

• Components cannot be separated

How can mixtures be separated?

• Based on physical properties

• By changing chemical properties

• By forming new substances

• By losing physical properties

What results from the interaction of two pure substances?

• A new substance with new physical properties

• A mixture with unchanged properties

• A separation of components

• No change in properties

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a pure substance?

• A material with a single chemical composition and unique properties

• A mixture of two or more substances

• A substance that can be separated by physical means

• A material that changes its properties when mixed

Which of the following is an example of a pure substance?

• Water

• Sand and iron filings

• Saltwater

• Air

What happens when two pure substances are mixed to form a mixture?

• They retain their own properties

• They form a new substance with new properties

• They lose their original properties

• They become a pure substance

Tags

NGSS.MS-PS1-2

How can you separate iron filings from sand in a mixture?

• Using a magnet

• Dissolving in water

• Heating the mixture

• Using a filter

What distinguishes a mixture from a new substance?

• Each part of a mixture keeps its own properties

• A mixture has a single chemical composition

• A new substance can be separated by physical means

• A mixture forms when substances interact and change