Chemical Reactions and Equations

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What is a chemical reaction?

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A process where substances (reactants) are transformed into new 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.

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What are products in a chemical equation?

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The new substances formed as a result of a chemical reaction.

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What does a coefficient in a chemical equation represent?

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The number of molecules or moles of a substance involved in the reaction.

Front

What does a subscript in a chemical formula indicate?

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The number of atoms of the element it follows in a molecule.

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What is the law of conservation of mass?

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In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

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What is an indicator of a chemical change?

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Signs such as color change, temperature change, gas production, or formation of a precipitate.

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What is a precipitate?

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A solid that forms and settles out of a liquid mixture during a chemical reaction.

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What is cellular respiration?

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A chemical process in which cells convert glucose and oxygen into energy, carbon dioxide, and water.

Front

What is the role of oxygen in combustion reactions?

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Oxygen acts as a reactant that combines with a fuel to produce energy, carbon dioxide, and water.