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-PS1-2

NGSS.MS-PS1-5

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How do you determine if a chemical equation is balanced?

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A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

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NGSS.MS-PS1-5

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What is a balanced chemical equation for the formation of sulfuric acid?

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4O2 + 2H2 + S2 -> 2H2SO4.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

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How many atoms of nitrogen are in 3N2O5?

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There are 6 nitrogen atoms in 3N2O5.

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NGSS.MS-PS1-1

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If reactant A weighs 5g and product C weighs 9g, how much should reactant B weigh?

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Reactant B should weigh 4g.

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NGSS.MS-PS1-5

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How many sulfur atoms are in the reactants of the equation 2SO2 + 2H2O2 -> 2H2SO4?

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There are 2 sulfur atoms in the reactants.

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NGSS.MS-PS1-1

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How many nitrogen atoms are present in one molecule of ammonia (NH3)?

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There is 1 nitrogen atom in one molecule of ammonia (NH3).

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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 important because it reflects the conservation of mass and ensures that the same number of atoms of each element are present before and after a reaction.

Tags

NGSS.MS-PS1-5

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What is the total mass of reactants in a balanced equation if the products weigh 20g?

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The total mass of the reactants must also be 20g, according to the Law of Conservation of Mass.

Tags

NGSS.MS-PS1-5

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What is the role of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of each substance involved in the reaction.