Conservation of Matter - Key Concepts

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What is the Law of Conservation of Matter?

Back

The Law of Conservation of Matter states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.

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What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that matter is conserved.

Front

Example of a balanced chemical equation: 2Na + Cl₂ → 2NaCl. What does this indicate?

Back

This indicates that 2 sodium atoms react with 1 chlorine molecule to produce 2 sodium chloride molecules, conserving the number of atoms.

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What is a reactant in a chemical reaction?

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A reactant is a substance that undergoes change during a chemical reaction.

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What is a product in a chemical reaction?

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A product is a substance that is formed as a result of a chemical reaction.

Front

In the equation CH₄ + 2O₂ → CO₂ + 2H₂O, identify the reactants and products.

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Reactants: CH₄ (methane) and O₂ (oxygen); Products: CO₂ (carbon dioxide) and H₂O (water).

Front

What is the significance of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in the reaction, helping to balance the equation.

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What is the role of subscripts in a chemical formula?

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Subscripts indicate the number of atoms of each element in a molecule; for example, in H₂O, the '2' indicates there are 2 hydrogen atoms.

Front

How do you determine if a chemical equation is balanced?

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Count the number of atoms of each element on both sides of the equation; if they are equal, the equation is balanced.

Front

What happens to the mass of reactants in a chemical reaction?

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The mass of the reactants is equal to the mass of the products, demonstrating the conservation of mass.