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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12

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3 (Carbon, Hydrogen, and Oxygen)

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6 atoms (2 Magnesium and 4 Chlorine)

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If a reaction starts with 20g of reactants, what is the total mass of the products?

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20g of products.

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What does the number written below an element in a chemical formula represent?

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Subscript.

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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 present.

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What is a subscript in a chemical formula?

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A subscript indicates the number of atoms of the element in a molecule.

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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 that change.

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5 atoms (1 Calcium, 2 Oxygen, and 2 Hydrogen)