Chemical Rxns Test Corrections

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What is a Double Replacement Reaction?

Back

A chemical reaction where two compounds exchange ions or bonds to form two new compounds. Example: HCl + NaOH → NaCl + H2O.

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What is a Decomposition Reaction?

Back

A type of chemical reaction where one compound breaks down into two or more simpler products. Example: 2HI → H2 + I2.

Front

What are coefficients in a chemical equation?

Back

Numbers placed before compounds in a chemical equation to indicate the number of molecules or moles of each substance involved in the reaction.

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What is a Synthesis Reaction?

Back

A chemical reaction where two or more simple substances combine to form a more complex product. Example: 2 K + Br2 → 2 KBr.

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What is a Combustion Reaction?

Back

A type of chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat. Example: C8H18 + O2 → CO2 + H2O.

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What is the general form of a chemical equation?

Back

Reactants are written on the left side, products on the right, separated by an arrow (→) indicating the direction of the reaction.

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What is the purpose of balancing a chemical equation?

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To ensure that the number of atoms of each element is the same on both sides of the equation, following the Law of Conservation of Mass.

Front

What is the Law of Conservation of Mass?

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A principle stating that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

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What is an example of a Single Replacement Reaction?

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A reaction where one element replaces another in a compound. Example: Zn + CuSO4 → ZnSO4 + Cu.

Front

What is an example of a chemical reaction that is not balanced?

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H2 + O2 → H2O (This equation is not balanced because there are 2 oxygen atoms on the left and only 1 on the right.)