5-3: Chemical Reactions

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What is a chemical reaction?

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A process in which substances (reactants) undergo a transformation to form new substances (products).

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are the signs of a chemical reaction?

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Color change, gas production, temperature change, formation of a precipitate, and odor change.

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NGSS.MS-PS1-2

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What is a synthesis reaction?

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A type of chemical reaction where two or more reactants combine to form a single product.

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NGSS.MS-PS1-5

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What is a decomposition reaction?

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A type of chemical reaction where a single compound breaks down into two or more simpler products.

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What is a single replacement reaction?

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A type of chemical reaction where one element replaces another element in a compound.

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What is a double replacement reaction?

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A type of chemical reaction where two compounds exchange ions or bonds to form two new compounds.

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What is combustion?

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A chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light and heat.

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NGSS.MS-PS1-4

NGSS.MS-PS1-5

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What is a precipitate?

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

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NGSS.MS-PS1-2

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What is the law of conservation of mass?

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In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

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NGSS.MS-PS1-5

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What is an exothermic reaction?

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A chemical reaction that releases energy, usually in the form of heat.

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NGSS.MS-PS3-4