Chemical Equations

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What is a chemical equation?

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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 does it mean to balance a chemical equation?

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Balancing a chemical equation means ensuring that the number of atoms for each element is the same on both sides of the equation.

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NGSS.MS-PS1-5

Front

What are reactants in a chemical equation?

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Reactants are the starting substances that undergo a chemical change in a reaction.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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What are products in a chemical equation?

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Products are the substances formed as a result of a chemical reaction.

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NGSS.MS-PS1-5

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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 chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

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NGSS.MS-PS1-5

Front

What is a subscript in a chemical formula?

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A subscript is a small number written to the right of an element symbol that indicates the number of atoms of that element in a molecule.

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Can you change subscripts to balance a chemical equation?

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No, you cannot change subscripts to balance a chemical equation; you can only change coefficients.

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How many hydrogen (H) atoms are in 2H₂O?

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There are 4 hydrogen (H) atoms in 2H₂O.

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NGSS.MS-PS1-1

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What does the number 2 represent in 2H₂O?

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The number 2 is a coefficient, indicating there are 2 molecules of water (H₂O).

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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 reactants equals the total mass of products.

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NGSS.MS-PS1-5