Physical Change and Chemical Change

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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 new chemical substances. It involves a chemical reaction and changes the chemical composition of the substance. Examples include burning, rusting, and bleaching.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Is melting ice a physical or chemical change?

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Melting ice is a physical change because it changes the state of water from solid to liquid without changing its chemical composition.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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Is burning wood a physical or chemical change?

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Burning wood is a chemical change because it transforms the wood into ash, smoke, and gases, changing its chemical composition.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What happens during a chemical change?

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

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are some indicators of a chemical change?

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Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

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NGSS.MS-PS1-2

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Is dissolving sugar in water a physical or chemical change?

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Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water, and its chemical composition remains unchanged.

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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 chopping wood. The wood is still wood, just in smaller pieces.

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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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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Can a physical change be reversed?

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Many physical changes can be reversed, such as freezing and melting, but not all, like breaking a glass.