7.2 Chemical Reactions & Energy

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What is a Chemical Reaction?

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A process where new substances are produced from one or more molecules of old substances.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are Reactants?

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The original substances you start with before a chemical reaction occurs.

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NGSS.MS-PS1-1

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What are Products in a chemical reaction?

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The new substances formed as a result of a chemical reaction.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is a Stakeholder?

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Entities like people, groups, or things that are impacted by design decisions.

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NGSS.MS-ETS1-1

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What is a Tradeoff?

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When one decision directly affects another decision, and you can’t do both things.

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NGSS.MS-ETS1-2

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What are Constraints in design?

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What our design cannot or should not do.

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NGSS.MS-ETS1-1

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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; it is conserved.

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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 in the form of heat.

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NGSS.HS-PS1-4

NGSS.HS-PS3-4

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What is an Endothermic Reaction?

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A chemical reaction that absorbs energy from its surroundings.

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NGSS.HS-PS1-4

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What is Activation Energy?

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The minimum energy required for a chemical reaction to occur.

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NGSS.HS-PS1-4