Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

In a chemical reaction, if the reactants have a total mass of 75g, what should the total mass of the products be?

Back

75g

Front

If a reaction starts with 12g of AB and produces 5g of B, how much A is produced?

Back

7g

Front

Matter cannot be created nor destroyed; it can only be...

Back

Transformed or changed.

Front

Which of the following is a balanced chemical equation? CH₄ + O₂ → CO₂ + 2H₂O, H₂ + O₂ → 2H₂O₄, 4Al + 3O₂ → 2Al₂O₃

Back

4Al + 3O₂ → 2Al₂O₃

Front

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

Back

The total mass remains constant.

Front

What is an example of a physical change?

Back

Melting ice.

Front

What is an example of a chemical change?

Back

Burning wood.

Front

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

Back

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

Front

If 10g of reactant A reacts with 15g of reactant B, what is the total mass of the products?

Back

25g