Characteristics of Chemical Reactions STEMscopes

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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. Examples include oxygen, hydrogen, and gold.

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What are reactants in a chemical reaction?

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Reactants are the starting materials in a chemical reaction that undergo change to form products.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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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 is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances with different properties.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is a physical change?

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A physical change is a change in the form or appearance of a substance, but not its chemical composition. Examples include melting, freezing, and dissolving.

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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; it is conserved.

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NGSS.MS-PS1-5

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What is a chemical equation?

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A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

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NGSS.MS-PS1-5

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What does the coefficient in a chemical equation represent?

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The coefficient in a chemical equation indicates the number of molecules or moles of a substance involved in the reaction.

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What is an endothermic reaction?

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An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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What is an exothermic reaction?

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An exothermic reaction is a chemical reaction that releases energy to its surroundings, usually in the form of heat.

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