1. Chemical Reactions

2. 4 Basic Types of Chemical Rxns Synthesis Decomposition Single Replacement Double Replacement

3. Synthesis Reaction Two or more simple substances combine to form a new, more complex substance. A + B ---> C

4. Synthesis Reactions Example: Na + Cl ----> NaCl Corrosion of metals are synthesis rxns.

5. Decomposition Reactions A complex substance breaks down into two or more simpler substances. Can you think of a decomposition reaction in biology?

6. Decomposition Reactions C ---> A + B Write an equation - Calcium Carbonate decomposes into calcium oxide and carbon dioxide.

7. Single-Replacement Reaction An uncombined element replaces an element that is part of a compound A + BX ---> AX + B Example: Sodium + water ---> Sodium hydroxide + hydrogen

8. Double-Replacement Reaction Different atoms in two different compounds replace each other. AX + BY ---> AY + BX MgCO 3 + 2 HCl ---> MgCl 2 + H 2 CO 3 The carbonic acid decomposes into water and carbon dioxide.