1. Decomposition Reactions By: Tori, Natalie, and Kaitie

2. Decomposition Reactions Decomposition reaction- when a single compound is broken down into two or more products Most decomposition reactions require energy in the form of heat, light, or electricity. Instead of building up it breaks down. (always have one compound)

3. Refresher BALANCING CHEMICAL EQUATIONS: H 2 (g) + O 2 (g) = H 2 0(l) Hydrogen is balanced but oxygen isn't. If you put a coefficient of 2 in front of H 2 O, the oxygen becomes balanced, but now the hydrogen is not. To fix this, put a coefficient of 2 in front of the H 2. 2H 2 + O 2 = 2H 2 O

4. To Balance Decomposition Reactions… A decomposition reaction always begins with one compound. 1.Identify the elements in the compound. Write the chemical formula on one side of the arrow and the products on the other 2.Balance the equation (remember HONClBrIF) Skeleton Equation: Al 2 S 3 Al + S Balanced Equation: Al 2 S 3 2Al + 3S

5. Now, Let’s try it! Skeleton equation: NaClNa + Cl 2 Balanced equation: 2NaCl 2Na + Cl 2

6. Chlorate Decomposition (*note: M stands for metal) Chlorates are compounds formed between a metal and the chlorate ion. Detailed explanation MClO 3 MCl 2 +O 2

7. Chlorate Decomposition Practice KClO 3 KCl + O 2 2KClO 3 2KCl + 3O 2

8. Carbonate Decomposition (*note: M stands for metal) Carbonates are compounds formed between a metal and the carbonate ion Detailed Explanation MCO 3 MO + CO 2

9. Carbonate Decomposition Practice Na 2 CO 3 Na 2 O + CO 2

10. Homework Question Write the skeleton equation for the decomposition of this compound, then balance it. HCl