Chemical & Physical Changes, Law of Conservation of Matter

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What is a physical change?

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A physical change is a change in which the form or appearance of matter changes, but its chemical composition remains the same. Examples include melting, freezing, and dissolving.

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NGSS.MS-PS3-5

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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. Examples include burning, rusting, and digestion.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What does the Law of Conservation of Matter state?

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The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.

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NGSS.MS-PS1-5

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What happens to mass during a physical change?

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Mass is always conserved during a physical change; the total mass of the substances before and after the change remains the same.

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What is evidence of a chemical reaction?

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Evidence of a chemical reaction includes the production of gas (bubbles), a change in temperature, a color change, or the formation of a precipitate (solid).

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NGSS.MS-PS1-2

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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

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 ice melting into water.

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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 iron rusting when it reacts with oxygen in the presence of moisture.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is the role of reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change to form products.

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NGSS.MS-PS1-1

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What are products in a chemical reaction?

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Products are the new substances formed as a result of a chemical reaction.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5