Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a closed system, the mass of the reactants must equal the mass of the products in a chemical reaction.

Front

Why is the mass of reactants equal to the mass of products in a chemical reaction?

Back

Because atoms are neither created nor destroyed during a chemical reaction; they are rearranged to form new substances.

Front

What happens to atoms during a chemical reaction?

Back

Atoms form new bonds with other atoms, creating different substances.

Front

Give an example of a chemical reaction that demonstrates conservation of mass.

Back

Burning wood: The mass of the wood and oxygen used equals the mass of the ash, carbon dioxide, and water produced.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.

Front

What is a product?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

How can we demonstrate conservation of mass in a lab experiment?

Back

By measuring the mass of reactants before a reaction and the mass of products after the reaction, ensuring they are equal.

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, reflecting the conservation of mass.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the Law of Conservation of Mass is upheld in chemical reactions.

Front

What is an example of a physical change?

Back

Melting ice is a physical change; the mass remains the same before and after the change.