1. Law of Conservation of Mass
Chemical Equations
Law of Conservation of Mass

2. Law of Conservation of Mass
Matter cannot be created or destroyed
Whatever element is on one side of a chemical equation, has got to be on the other side as well, in the same type and amount

3. 2H2 + O H2O
Reactants – the compounds found on the left side of the arrow, the compounds put into the reaction
Products – the compounds formed during the chemical reaction

4. 2H2 + O2 2 H2O Types of questions you will be asked:
How many of ___ element are on the reactant/product side of the equation?
Which of these equations follows the Law of Conservation of Mass?
Is this equation balanced?

5. Steps to determining balanced equations:
Draw a T-Chart on both sides
List elements – don’t repeat
Check for () and distribute
Check for coefficients and distribute
Total up both sides – all elements should match

6. Practicing with equations