Law of Conservation of Mass

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be created or destroyed; it can only be transformed or changed.

Front

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

Back

The mass of the reactants before the reaction is equal to the mass of the products after the reaction.

Front

Can matter be created or destroyed in a chemical reaction?

Back

No, matter is always conserved.

Front

What is an example of a physical change where mass is conserved?

Back

Ice melting into water; the mass remains the same.

Front

If a reaction starts with 50g of reactants, what will be the mass of the products?

Back

The mass of the products will also be 50g.

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, with no change in total mass.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash, smoke, and gases.

Front

What is an example of a physical change?

Back

Dissolving sugar in water; the sugar can be recovered.

Front

What does it mean for a reaction to be balanced?

Back

The number of atoms of each element is the same on both sides of the equation.