Law of Conservation of Mass/Energy

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

If a reaction starts with 20g of reactants, how much mass will the products have?

Back

20g of products.

Front

The law of conservation of mass states that substances can neither be _______ nor ___________.

Back

Created; destroyed.

Front

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

Back

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

Front

Can matter be created or destroyed in a chemical reaction?

Back

No, matter is always conserved.

Front

If 4 grams of hydrogen and 32 grams of oxygen combine, what is the total mass of water produced?

Back

36 grams of water.

Front

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

Back

Melting ice into water.

Front

What is an example of a chemical reaction where mass is conserved?

Back

Burning wood produces ash and gases, but the total mass remains the same.

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.

Front

What is the significance of the Law of Conservation of Energy?

Back

Energy cannot be created or destroyed, only transformed from one form to another.