Exploring Physical and Chemical Changes

The video tutorial discusses physical and chemical properties, explaining how physical properties can be observed without changing the substance, while chemical properties involve reactions that create new substances. Examples of physical changes include ice melting and paper cutting, where the original substance remains. Chemical changes, such as sodium reacting with chlorine to form salt, result in new substances with different properties. The video also covers evidence of chemical changes, like bubbling or unexpected temperature changes, and concludes with an activity to identify these changes.

What defines a physical property of a substance?

• How it reacts with other substances

• Its ability to conduct electricity

• Its color, texture, and shape

• The new substances it forms

Tags

NGSS.MS-PS1-4

What remains unchanged in a physical change?

• The chemical composition

• The appearance

• The temperature

• The phase of matter

What is an example of a chemical change?

• Freezing water

• Cutting paper

• Melting of ice

• Burning wood

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens when sodium and chlorine combine?

• They form a poisonous gas

• They separate into their original forms

• They dissolve in water

• They create table salt

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is an indicator of a chemical change?

• Change in position

• Change in shape

• Change in size

• Formation of a precipitate

Tags

NGSS.MS-PS1-2

What does the formation of bubbles signify in a reaction?

• Chemical change

• Physical change

• No change

• Phase change

Tags

NGSS.MS-PS1-2

What is the result when two liquids form a solid?

• Physical change

• Chemical change

• Temperature change

• No change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a key characteristic of a chemical change?

• A new substance with new properties forms

• The original substance remains

• It only occurs in liquids

• It is reversible

Tags

NGSS.MS-PS1-2

What evidence supports a physical change?

• New substance forms

• Original substance still exists

• Smoke or fire

• Unexpected color change

What should students do with the cards in the classroom activity?

• Sort them based on weight

• Sort them based on size

• Sort them based on color

• Sort them based on evidence of change

Tags

NGSS.MS-PS1-2