1. Double Replacement Reactions

2. Two ionic compounds react to form two new ionic compounds; switching partners Two ionic compounds react to form two new ionic compounds; switching partners AB + CD CB + AD AB + CD CB + AD The result of this reaction produces two new compounds, one of which is a precipitate, water, or gas The result of this reaction produces two new compounds, one of which is a precipitate, water, or gas

3. Double Replacement Reactions Cations switch places with cations OR think of it as metals switching with metals Cations switch places with cations OR think of it as metals switching with metals 3 CaCl 2 + 2 AlN 2 AlCl 3 + Ca 3 N 2 3 CaCl 2 + 2 AlN 2 AlCl 3 + Ca 3 N 2

4. Double Replacement Reactions Each compound formed must be checked to see if it is a gas, precipitate, or water Each compound formed must be checked to see if it is a gas, precipitate, or water Gas = (g) or Gas = (g) or Precipitate = (s) or Precipitate = (s) or Aqueous Solution (solvent is water) = (aq) Aqueous Solution (solvent is water) = (aq) Liquid = (l) Liquid = (l)

5. Double Replacement Reactions If a gas, water, or precipitate is not formed, the reaction will not take place If a gas, water, or precipitate is not formed, the reaction will not take place Formation of a precipitate Formation of a precipitate - AgNO 3(aq) + NaCl (aq) NaNO 3(aq) + AgCl (s) Formation of a gas Formation of a gas - FeS (s) + 2 HCl (aq) 2 H 2 S (g) + FeCl 2(aq) Formation of water Formation of water - HCl (aq) + NaOH (aq) NaCl (aq) + H 2 O (l)

6. Combustion Reactions Occurs when a hydrocarbon combines with oxygen gas in the air – burning Occurs when a hydrocarbon combines with oxygen gas in the air – burning Combustion of Propane Combustion of Propane C 3 H 8(g) + 5 O 2(g) 3 CO 2(g) + 4 H 2 O (g) C 3 H 8(g) + 5 O 2(g) 3 CO 2(g) + 4 H 2 O (g)