Law of Conservation of Mass

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What does the Law of Conservation of Mass state?

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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

Front

How many nitrogen atoms are present in the compound 3N₂O₅?

Back

There are 6 nitrogen atoms in 3N₂O₅.

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NGSS.MS-PS1-1

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What is a coefficient in a chemical equation?

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A coefficient is a number placed in front of a compound or element in a chemical equation to indicate the number of molecules or moles of that substance.

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What happens to the mass of products when a compound is heated?

Back

The mass of the products equals the mass of the original compound, according to the Law of Conservation of Mass.

Tags

NGSS.MS-PS1-5

Front

How many oxygen atoms are in the chemical formula 3N₂O₅?

Back

There are 6 oxygen atoms in 3N₂O₅.

Tags

NGSS.MS-PS1-1

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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, reflecting the Law of Conservation of Mass.

Tags

NGSS.MS-PS1-5

Front

What is the significance of balancing chemical equations?

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Balancing chemical equations ensures that the mass and number of atoms are conserved during a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

In the reaction CaCO₃ → CaO + CO₂, what is the total mass of the products if 100 g of CaCO₃ is used?

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The total mass of the products (CaO and CO₂) will equal 100 g.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

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 subscript '2' indicates there are 2 hydrogen atoms.

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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.

Tags

NGSS.MS-PS1-5