The Law of Conservation of Mass

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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 the reactants equals the total mass of the products.

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NGSS.MS-PS1-5

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In the chemical formula C_{12}H_{22}O_{11}, how many hydrogen (H) atoms are present?

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There are 22 hydrogen (H) atoms in the chemical formula C_{12}H_{22}O_{11}.

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NGSS.MS-PS1-1

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How many total atoms are in the compound 2MgCl_{2}?

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There are 6 total atoms in the compound 2MgCl_{2} (2 magnesium and 4 chlorine atoms).

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NGSS.MS-PS1-1

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What is a chemical change?

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A chemical change is a process where substances combine or break apart to form new substances, often accompanied by fizzing, foaming, or burning.

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NGSS.MS-PS1-5

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In the chemical formula C_{12}H_{22}O_{11}, how many oxygen (O) atoms are present?

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There are 11 oxygen (O) atoms in the chemical formula C_{12}H_{22}O_{11}.

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NGSS.MS-PS1-1

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What is the significance of balancing chemical equations?

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Balancing chemical equations ensures that the Law of Conservation of Mass is upheld, meaning the number of atoms for each element is the same on both sides of the equation.

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NGSS.MS-PS1-5

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What is the difference between reactants and products in a chemical reaction?

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

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NGSS.MS-PS1-5

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How can you determine the number of atoms in a compound from its chemical formula?

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You can determine the number of atoms in a compound by adding the subscripts in the chemical formula, which indicate the number of each type of atom present.

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NGSS.MS-PS1-1

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What is an example of a physical change?

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An example of a physical change is melting ice into water, where the substance changes state but remains the same chemically.

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NGSS.MS-PS1-4

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What is the role of coefficients in a chemical equation?

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Coefficients indicate the number of molecules or moles of a substance involved in a reaction and are used to balance chemical equations.