1. Chemical Reactions Notes

2. Reactants Products Substances that undergo a change New substances formed Yields or Produces

3. Chemical Equations A representation of a chemical reaction Tells you the substances present before a change and after a change

5. Law of Conservation of Mass Mass is neither created nor destroyed in a chemical reaction

6. Balancing Equations In order to show that mass is conserved during a chemical reaction, a chemical equation must be balanced

7. Coefficients The numbers that appear before a chemical formula Can be changed in order to balance an equation

8. H 2 3O 2 4NH 3 2H 2 PO 4

9. C+ O 2  CO 2

10. Cu + O 2  CuO

11. H 2 + O 2  H 2 O

12. N 2 H 4 + O 2  N 2 + H 2 O