Unit 5 Review Chem

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What is the Law of Conservation of Mass?

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The Law of Conservation of Mass states that in a chemical reaction, the mass of the reactants is equal to the mass of the products. Matter cannot be created or destroyed.

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What type of reaction is a Double Replacement Reaction?

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A Double Replacement Reaction occurs when two compounds exchange ions or bonds to form two new compounds. Example: Ca(NO3)2 + Na2SO4 → CaSO4 + 2NaNO3.

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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 and heat. Example: C2H2 + O2 → CO2 + H2O.

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What is a Synthesis Reaction?

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A Synthesis Reaction is a type of reaction where two or more reactants combine to form a single product. Example: 2H2 + O2 → 2H2O.

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What is a Single Replacement Reaction?

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A Single Replacement Reaction occurs when one element replaces another in a compound. Example: Zn + 2HCl → H2 + ZnCl2.

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What is a Decomposition Reaction?

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A Decomposition Reaction is a type of reaction where a single compound breaks down into two or more simpler products. Example: 2H2O → 2H2 + O2.

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What is the general form of a chemical equation?

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The general form of a chemical equation is: Reactants → Products. It shows the substances involved in a reaction and their transformation.

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What is the role of coefficients in a chemical equation?

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Coefficients are numbers placed before compounds in a chemical equation to indicate the number of molecules or moles of that substance involved in the reaction.

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What is the difference between reactants and products?

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Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

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What is an example of a chemical reaction that demonstrates the Law of Conservation of Mass?

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In the reaction 2H2 + O2 → 2H2O, the total mass of the reactants (4g) equals the total mass of the products (4g), demonstrating the Law of Conservation of Mass.