Balancing Equations

Front

What is the Law of Conservation of Mass?

Back

Matter cannot be created nor destroyed.

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NGSS.MS-PS1-5

Front

What does it mean to balance an equation?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation.

Tags

NGSS.MS-PS1-5

Front

What is a reactant in a chemical equation?

Back

A substance that undergoes a chemical change in a reaction.

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NGSS.MS-PS1-2

Front

What is a product in a chemical equation?

Back

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

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NGSS.MS-PS1-2

Front

How do you know if a chemical equation is balanced?

Back

By counting the number of atoms of each element on both sides of the equation.

Tags

NGSS.MS-PS1-5

Front

What is the balanced equation for the reaction of hydrogen and oxygen to form water?

Back

2H₂ + O₂ → 2H₂O

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

What is the balanced equation for the reaction of sodium and oxygen to form sodium peroxide?

Back

2Na + O₂ → Na₂O₂

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the balanced equation for the reaction of carbon and sulfur to form carbon disulfide?

Back

4C + S₈ → 4CS₂

Tags

NGSS.MS-PS1-5

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules are involved.

Tags

NGSS.MS-PS1-5

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol indicating the number of atoms of that element in a molecule.