Chemical Reactions (Types, Cons of Mass and Balancing) Review

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What is a chemical reaction?

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A process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.

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What are reactants in a chemical equation?

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The starting substances that undergo a chemical change in a reaction, found on the left side of the equation.

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What are products in a chemical equation?

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The substances that are formed as a result of a chemical reaction, found on the right side 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 total mass of reactants equals the total mass of products.

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What is a coefficient in a chemical equation?

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A number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

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What is a subscript in a chemical formula?

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A small number written to the lower right of an element symbol that indicates 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 that the number of atoms of each element is the same on both sides of the equation.

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What is an example of a synthesis reaction?

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A reaction where two or more reactants combine to form a single product, e.g., 2H₂ + O₂ → 2H₂O.

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What is an example of a decomposition reaction?

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A reaction where a single compound breaks down into two or more simpler products, e.g., 2H₂O → 2H₂ + O₂.

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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, e.g., Zn + 2HCl → ZnCl₂ + H₂.