Law of Conservation of Mass

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What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

How many atoms of an element are represented by a coefficient in a chemical formula?

Back

The coefficient indicates the number of molecules, and each molecule contains a specific number of atoms as indicated by the subscripts.

Front

What does a subscript in a chemical formula represent?

Back

A subscript indicates the number of atoms of the element in one molecule of the compound.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

Front

What is the purpose of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the Law of Conservation of Mass is upheld, showing that the same amount of matter exists before and after the reaction.

Front

In the equation 4NH₃, what does the number 4 represent?

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The number 4 is a coefficient, indicating that there are 4 molecules of ammonia (NH₃).

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What are reactants in a chemical reaction?

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Reactants are the starting substances that undergo a chemical change to form products.

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What are products in a chemical reaction?

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

Front

If 2H₂ + O₂ → 2H₂O, how many hydrogen atoms are in the products?

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There are 4 hydrogen atoms in the products (2 molecules of H₂O, each containing 2 hydrogen atoms).

Front

What happens to the total mass of reactants in a chemical reaction?

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The total mass of the reactants is equal to the total mass of the products, according to the Law of Conservation of Mass.