Balancing Chemical Equations

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What is the little number after an element in a chemical equation called?

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Subscript

Front

Which of the following equations are correctly balanced? 12CO₂ + H₂O → C₆H₁₂O₆ + O₂, CO₂ + 9H₂O → C₆H₁₂O₆ + O₂, CO₂ + H₂O → 3C₆H₁₂O₆ + O₂, 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

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6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Front

Is the following equation balanced? 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

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Yes

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Is the following reaction balanced? NaHCO₃ → Na₂CO₃ + H₂O + CO₂

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No

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How many atoms of carbon (C) are in C₆H₁₂O₆?

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6

Front

What is a coefficient in a chemical equation?

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

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What does it mean to balance a chemical equation?

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Balancing a chemical equation means ensuring that the number of atoms for each element is the same on both sides of the equation.

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What is the law of conservation of mass?

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The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

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What is the purpose of balancing chemical equations?

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The purpose is to accurately represent the quantities of reactants and products in a chemical reaction.

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What is the difference between a reactant and a product?

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Reactants are substances that undergo a chemical change, while products are the substances formed as a result of that change.