A chemical equation represents a chemical reaction using formulas to show the reactants and products. It uses coefficients to indicate the ratio in which substances react or are produced, and parentheses to show the state of each substance. A chemical reaction conserves mass according to the law of conservation of mass. There are four main types of chemical reactions: synthesis, decomposition, single replacement, and double replacement.

1. Chemistry 30S Unit 3 – Chemical Reactions

11. CHEMICAL REACTIONS Balancing Equations Example 1. Balance the equation C 3 H 8 + O 2 CO 2 + H 2 O

12. CHEMICAL REACTIONS Balancing Equations Example 2. Balance the equation Fe + O 2 Fe 2 O 3 2't'1

13. CHEMICAL REACTIONS Balancing Equations Example 3. Balance the equation Al 2 (SO 4 ) 3 + CaCl 2 AlCl 3 + CaSO 4

14. CHEMICAL REACTIONS Types of Chemical Reactions & Predicting Their Products JIGSAW ACTIVITY Synthesis Decomposition Single Replacement Double Replacement