Chemical Equations

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What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

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NGSS.MS-PS1-5

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What do coefficients in a chemical equation represent?

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

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

Front

What do subscripts in a chemical formula indicate?

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Subscripts indicate the number of atoms of an element in a molecule.

Tags

NGSS.MS-PS1-1

Front

How do you determine the total number of atoms in a compound?

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Add the number of atoms of each element, multiplied by their respective coefficients.

Front

What is the difference between a reactant and a product?

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Reactants are substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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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.

Tags

NGSS.MS-PS1-5

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How many total atoms are in the compound 4NH3?

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There are 16 total atoms in 4NH3 (4 nitrogen and 12 hydrogen).

Tags

NGSS.MS-PS1-1

Front

What does the number 3 represent in the formula NH3?

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The number 3 is a subscript indicating there are 3 hydrogen atoms in one molecule of ammonia.

Tags

NGSS.MS-PS1-1

Front

What does the number 4 represent in the formula 4NH3?

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The number 4 is a coefficient indicating there are 4 molecules of ammonia.

Tags

NGSS.MS-PS1-1

Front

How many hydrogen atoms are in 4NH3?

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There are 12 hydrogen atoms in 4NH3 (4 molecules x 3 hydrogen atoms each).

Tags

NGSS.MS-PS1-1