Law of Conservation of Mass

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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; the total mass of the reactants equals the total mass of the products.

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NGSS.MS-PS1-5

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What is a balanced chemical equation?

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

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NGSS.MS-PS1-5

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How do you determine if a chemical equation is balanced?

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To determine if a chemical equation is balanced, count the number of atoms of each element on both sides of the equation and ensure they are equal.

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NGSS.MS-PS1-5

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What does a subscript in a chemical formula indicate?

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A subscript in a chemical formula indicates the number of atoms of the element that are present in a molecule.

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NGSS.MS-PS1-1

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What does a coefficient in a chemical equation represent?

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A coefficient in a chemical equation represents the number of molecules or moles of a substance involved in the reaction.

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NGSS.MS-PS1-1

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How many hydrogen (H) atoms are in 4NH₃?

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There are 12 hydrogen (H) atoms in 4NH₃ because each NH₃ molecule contains 3 hydrogen atoms (4 x 3 = 12).

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NGSS.MS-PS1-1

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What is the significance of balancing chemical equations?

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Balancing chemical equations is significant because it reflects the conservation of mass and allows for accurate stoichiometric calculations.

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NGSS.MS-PS1-5

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What happens if a chemical equation is not balanced?

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If a chemical equation is not balanced, it does not accurately represent the reaction, leading to incorrect predictions about the amounts of reactants and products.

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NGSS.MS-PS1-5

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Can you give an example of a balanced chemical equation?

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An example of a balanced chemical equation is 2H₂ + O₂ → 2H₂O, where there are 4 hydrogen atoms and 2 oxygen atoms on both sides.

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NGSS.MS-PS1-5

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What is the role of coefficients in stoichiometry?

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Coefficients in stoichiometry are used to determine the relative amounts of reactants and products involved in a chemical reaction.