Characteristics of Chemical Reactions STEMscopes

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What is a Reactant?

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A reactant is a substance that undergoes a chemical change in a reaction.

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What is a Product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

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What does it mean for a chemical equation to be balanced?

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A balanced chemical equation has the same number of each type of atom on both sides of the equation.

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NGSS.MS-PS1-5

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What is a Chemical Reaction?

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A chemical reaction is a process in which atoms rearrange to form new substances.

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What is an Element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means.

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What is a Coefficient in a chemical equation?

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A coefficient is a number placed in front of a chemical formula to indicate how many molecules or atoms are involved.

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What is a Chemical Subscript?

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A chemical subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

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NGSS.MS-PS1-1

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What is the Law of Conservation of Mass?

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The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction.

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NGSS.MS-PS1-5

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What is an example of a chemical change?

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An example of a chemical change is rust forming on iron.

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What is the difference between a physical change and a chemical change?

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A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

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