Balancing Equations and Mass Conservation

What is the law of conservation of mass?

• Mass can be created and destroyed in a chemical reaction.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass is always increased in a chemical reaction.

• Mass is always decreased in a chemical reaction.

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NGSS.MS-PS1-5

Which of the following is a balanced chemical equation?

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NGSS.MS-PS1-5

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• 2

• 3

• 4

• 5

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NGSS.MS-PS1-5

Which of the following statements is true about a balanced chemical equation?

• The number of atoms of each element is the same on both sides of the equation.

• The number of molecules is the same on both sides of the equation.

• The number of compounds is the same on both sides of the equation.

• The number of moles is the same on both sides of the equation.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What is the first step in balancing a chemical equation?

• Change the subscripts of the compounds.

• Count the number of atoms of each element in the reactants and products.

• Add coefficients to balance the atoms.

• Remove compounds from the equation.

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NGSS.MS-PS1-5

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NGSS.MS-PS1-5

Which of the following is an example of a chemical reaction that follows the law of conservation of mass?

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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