1. Types of Reactions 1.Synthesis reactions 2.Decomposition reactions 3.Single displacement reactions 4.Double displacement reactions 5.Combustion reactions You need to be able to identify each type.

2. 1. Synthesis Example C + O 2 OO C +  OO C General: A + B  AB

3. Ex. Synthesis Reaction

4. Practice Predict the products. Na (s) + Cl 2(g)  Mg (s) + F 2(g)  Al (s) + F 2(g)  NaCl (s) MgF 2(s) AlF 3(s) 2 2 232 Now, balance them.

5. 2. Decomposition Example: NaCl General: AB  A + B  Cl Na Cl + Na

6. Ex. Decomposition Reaction

7. 3. Single Replacement (Single Displacement) Example: Zn + CuCl 2  Zn Cl Cu + General: AB + C  AC + B Cl Zn Cu + Zn was oxidized Went from neutral (0) to (+2) Cu was reduced Went from (+2) to Neutral (0)

8. Ex. Single Replacement Reaction

9. Single Replacement Reactions Write and balance the following single replacement reaction equation: Zn (s) + HCl (aq)  ZnCl 2 + H 2(g) 2 NaCl (s) + F 2(g)  NaF (s) + Cl 2(g) Al (s) + Cu(NO 3 ) 2(aq)  22 Cu (s) + Al(NO 3 ) 3(aq) 3 23 2

10. 4. Double Replacement Example: MgO + CaS General:AB + CD  AD + CB S O  Mg Ca + O S Mg Ca +

11. Double Replacement Reactions Think about it like “foil”ing in algebra, first and last ions go together + inside ions go together Example: AgNO 3(aq) + NaCl (s)  AgCl (s) + NaNO 3(aq) Another example: K 2 SO 4(aq) + Ba(NO 3 ) 2(aq)  KNO 3(aq) + BaSO 4(s) 2

12. Practice Predict the products. 1.HCl (aq) + AgNO 3(aq)  2.CaCl 2(aq) + Na 3 PO 4(aq)  3.Pb(NO 3 ) 2(aq) + BaCl 2(aq)  4.FeCl 3(aq) + NaOH (aq)  5.H 2 SO 4(aq) + NaOH (aq)  6.KOH (aq) + CuSO 4(aq) 

13. 5. Combustion Reactions Combustion reactions - a substance reacts with oxygen gas. This is also called burning!!! In order to burn something you need 3: 1) Other Reactant 2) Oxygen 3) Something to ignite the reaction (spark, heat)

14. Combustion Reactions For hydrocarbons: C x H y + O 2  CO 2 + H 2 O Products are ALWAYS carbon dioxide and water. (although incomplete burning does cause some by-products like carbon monoxide) Combustion is used to heat homes and run automobiles (octane, as in gasoline, is C 8 H 18 )

15. Combustion Example C 5 H 12 + O 2  CO 2 + H 2 O Write the products and balance the following combustion reaction: C 10 H 22 + O 2  5 6 8

16. Combustion Reactions, Part 2 For metals: M + O 2  MO x Product is ALWAYS a metal oxide Example Ca + O 2  CaO Fe + O 2  Fe 2 O 3

17. Mixed Practice State the type & predict the products. 1.BaCl 2 + H 2 SO 4  2.C 6 H 12 + O 2  3.Zn + CuSO 4  4.Cs + Br 2  5.FeCO 3 