1. Reaction Types Chapter 6.2

2. Synthesis reactions combine substances Example C + O 2  CO 2 OO C +  OO C OO C OO C O O C O O C O O C O O C O O C O O C O O C O O C O O C O O C O O C O O C General: A + B  AB

3. Synthesis Example: NaCl  Na + Cl General: A + B  AB

4. Decomposition reactions break substances apart Example 2HgO  2 Hg + O 2  O Hg O OO + General: AB  A + B

5. Decomposition Examples Digestion (breaking down food molecules into simpler substances) Electrolysis of water –Electrolysis—the process by which an electric current is used to produce a chemical reaction –2H 2 0 (with electricity)  2H 2 + O 2

6. Electrolysis of Water

7. In single displacement reactions, elements trade place! Example: CuCl 2 + Zn  ZnCl 2 + Cu  Zn Cl Cu + General: AX + B  BX + A Cl Zn Cu +

8. In double displacement reactions, ions are exchanged between compounds Example: MgO + CaS  MgS + CaO General:AX + BY  AY + BX S O  Mg Ca + O S Mg Ca +

9. Combustion is a reaction involving oxygen, where heat is released Example: 2CH 4 + 4O 2  CO 2 + 4H 2 O

10. Combustion products depend on the amount of oxygen present If not enough oxygen is present, a combustion reaction may produce the toxic carbon monoxide as a product Example: 2CH 4 + 3O 2  CO + 4H 2 O

11. Your favorite! It’s good to hear it again though…