Physical and Chemical Changes

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling) and changes in shape or size.

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NGSS.MS-PS1-4

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and can be identified by changes such as color change, temperature change, gas production, or the formation of a precipitate.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes color change, temperature change, gas production (bubbles), and the formation of a precipitate.

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NGSS.MS-PS1-2

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What is rusting?

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Rusting is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide (rust), which is a new substance.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What happens to the temperature during a chemical change?

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During a chemical change, the temperature can change as a result of the reaction, indicating that energy is either absorbed or released.

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NGSS.MS-PS1-2

NGSS.MS-PS3-4

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What is a precipitate?

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A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

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NGSS.MS-PS1-2

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What is an example of a physical change?

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An example of a physical change is boiling water, where water changes from liquid to gas but remains H2O.

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NGSS.MS-PS1-4

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What is an example of a chemical change?

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An example of a chemical change is the reaction between baking soda and vinegar, which produces carbon dioxide gas and a new substance.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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How can you tell if a chemical change has occurred?

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You can tell if a chemical change has occurred by observing signs such as color change, gas production, temperature change, or the formation of a precipitate.

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NGSS.MS-PS1-2

Front

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

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A physical change does not create a new substance and only changes physical properties, while a chemical change results in the formation of new substances.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4