Law of Conservation of Mass

Front

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. The total mass of reactants equals the total mass of products.

Front

What does it mean for a chemical reaction to be balanced?

Back

A chemical reaction is balanced when both sides have the same number of atoms for each element involved.

Front

Which of the following is not a chemical reaction: Burning of wood, Milk going bad, Mixing vinegar and baking soda, Melting of ice?

Back

Melting of ice is not a chemical reaction; it is a physical change.

Front

What is a precipitate?

Back

A precipitate is a solid that forms when two liquids are mixed together in a chemical reaction.

Front

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

Back

The total mass of products should also be 20g, according to the Law of Conservation of Mass.

Front

What is an example of a chemical reaction?

Back

Burning of wood is an example of a chemical reaction, as it involves a change in the chemical composition of the substances.

Front

What happens to the mass of reactants during a chemical reaction?

Back

The mass of reactants remains constant and equals the mass of the products.

Front

What is the role of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of each substance involved in the reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without altering its chemical structure.