Balancing Chemical Equations and Types of Reactions Review

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What is a Single Replacement Reaction?

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A chemical reaction where one element replaces another in a compound. Example: A + BC → AC + B.

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What is a Synthesis Reaction?

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A reaction where two or more substances combine to form a single product. Example: A + B → AB.

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What is a Decomposition Reaction?

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A reaction where a single compound breaks down into two or more simpler products. Example: AB → A + B.

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What is a Double Replacement Reaction?

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A reaction where the anions and cations of two different compounds switch places, forming two new compounds. Example: AB + CD → AD + CB.

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What is a Combustion Reaction?

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

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What are Coefficients in a chemical equation?

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

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What are Subscripts in a chemical formula?

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Numbers written below and to the right of an element symbol in a chemical formula, indicating the number of atoms of that element in a molecule.

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How do you balance a chemical equation?

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By adjusting the coefficients of the reactants and products to ensure the same number of each type of atom on both sides of the equation.

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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 mass of reactants equals the mass of products.

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What is the general form of a combustion reaction?

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Hydrocarbon + O₂ → CO₂ + H₂O.