Physical vs Chemical Changes

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What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a change in the chemical composition of the original substance.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Give an example of a physical change.

Back

Ripping up paper is an example of a physical change.

Front

What happens during a phase change?

Back

During a phase change, a substance changes from one state of matter to another (e.g., solid to liquid) without changing its chemical identity.

Tags

NGSS.MS-PS1-4

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include the formation of bubbles, a change in color, a change in odor, or the release of heat.

Tags

NGSS.MS-PS1-2

Front

What occurs when bubbles form during a reaction?

Back

The formation of bubbles typically indicates a chemical change, often due to the production of gas.

Tags

NGSS.MS-PS1-2

Front

How can you tell if a chemical change has occurred when cooking food?

Back

A chemical change has occurred if the food changes in taste, color, or smell, indicating a change in its chemical composition.

Tags

NGSS.MS-PS1-2

Front

What is the significance of odor change in a chemical reaction?

Back

A change in odor can signify a chemical reaction has taken place, indicating the formation of new substances.

Tags

NGSS.MS-PS1-2

Front

What is the difference between a physical and a chemical change?

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

Tags

NGSS.MS-PS1-4

Front

Can a physical change be reversed?

Back

Many physical changes can be reversed (e.g., freezing and melting), but some may not be easily reversible.