Chemical Reactions and Properties

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What is a single replacement reaction?

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A single replacement reaction is a type of chemical reaction where one element replaces another element in a compound. For example, in the reaction Na2S + 2Li 🡪 Li2S + 2Na, lithium replaces sodium.

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What does the symbol (aq) represent in a chemical equation?

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The symbol (aq) stands for 'aqueous', indicating that a substance is dissolved in water.

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What is the general equation for a synthesis reaction?

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The general equation for a synthesis reaction is A + B 🡪 AB, where two or more reactants combine to form a single product.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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What is the purpose of coefficients in a chemical equation?

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Coefficients are used to balance a chemical equation, indicating the number of molecules or moles of each substance involved in the reaction.

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What is not considered evidence of a chemical reaction?

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A state of matter change is not considered evidence of a chemical reaction, while formation of a precipitate, production of a gas, and sudden release of light are.

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NGSS.MS-PS1-2

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What is a decomposition reaction?

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A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products. For example, AB 🡪 A + B.

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NGSS.MS-PS1-1

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What is a combustion reaction?

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A combustion reaction is a chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat. For example, burning hydrocarbons.

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NGSS.MS-PS1-5

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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 or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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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

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What does the symbol (s) represent in a chemical equation?

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The symbol (s) stands for 'solid', indicating that a substance is in solid state.