Physical and 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. Examples include melting, freezing, and boiling.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What is a chemical change?

Back

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, gas production, or the formation of a precipitate.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

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.

Tags

NGSS.MS-PS1-2

Front

What evidence indicates a chemical change has occurred?

Back

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

Tags

NGSS.MS-PS1-2

Front

What happens to water when it boils?

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When water boils, it undergoes a physical change from liquid to gas (steam) due to the addition of heat.

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NGSS.MS-PS1-4

NGSS.MS-PS3-5

Front

What is the difference between a physical change 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.

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NGSS.MS-PS1-2

Front

What is an example of a physical change?

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

Front

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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What does it mean when a substance dissolves?

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When a substance dissolves, it undergoes a physical change where it mixes uniformly with a solvent, but its chemical identity remains the same.

Front

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

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A temperature change during a chemical reaction can indicate that a chemical change has occurred, as it often involves the release or absorption of energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4