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 melting, freezing, and dissolving.

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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 one or more new substances with different properties. Examples include rusting, burning, and cooking.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are signs that a chemical reaction has occurred?

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Signs of a chemical reaction include the formation of a gas, color change, temperature change, and the formation of a precipitate.

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NGSS.MS-PS1-2

Front

Is melting ice a physical or chemical change?

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Melting ice is a physical change because it changes from solid to liquid without altering its chemical composition.

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What happens during a chemical change?

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During a chemical change, the bonds between atoms are broken and new bonds are formed, resulting in new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is an example of a physical change?

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An example of a physical change is the melting of wax.

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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 of vinegar and baking soda, which produces carbon dioxide gas.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

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 gas formation, color change, or temperature change.

Tags

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 change the chemical composition of a substance, while a chemical change results in the formation of new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a sign of a chemical reaction?

Back

The formation of a gas is a sign of a chemical reaction.

Tags

NGSS.MS-PS1-2