Physical and Chemical Changes Review

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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 melting, freezing, and dissolving.

Tags

NGSS.MS-PS1-4

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 the rearrangement of atoms. Examples include rusting, burning, and baking.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What evidence indicates a chemical change has occurred?

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Evidence of a chemical change includes the formation of gas, a change in color, the formation of a precipitate, or a change in temperature.

Tags

NGSS.MS-PS1-2

Front

What happens to the molecules during a physical change?

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During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

Front

What happens to the molecules during a chemical change?

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During a chemical change, the bonds between molecules break and new bonds form, resulting in the creation of new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water.

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NGSS.MS-PS1-4

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake, where ingredients react to form a new substance.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

How can temperature affect physical changes?

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Temperature can cause substances to change states, such as ice melting to water when heated or water freezing to ice when cooled.

Tags

NGSS.MS-PS1-4

Front

What is the role of heat in chemical changes?

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Heat can provide the energy needed for a chemical reaction to occur, often resulting in the formation of new substances.

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NGSS.MS-PS3-4

Front

What is a precipitate?

Back

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5