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

What happens to atoms during a chemical reaction?

Back

Atoms are neither created nor destroyed; they are rearranged to form new substances.

Front

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

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Front

What is a reactant in a chemical reaction?

Back

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

Front

What is a product in a chemical reaction?

Back

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

Front

How can you tell if a chemical equation is balanced?

Back

You can tell if a chemical equation is balanced by counting the number of atoms of each element on both sides of the equation.

Front

What is an example of a balanced chemical equation?

Back

An example of a balanced chemical equation is: 2H2 + O2 -> 2H2O.

Front

What changes during a chemical reaction?

Back

The properties of the new substance change, but the total mass and number of atoms remain the same.

Front

What is the significance 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.