1. Double Replacement Reactions

2. Double Replacement Reactions
Two ionic compounds react to form two new ionic compounds; “switching partners”
AB + CD  CB + AD
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”
3 CaCl2 + 2 AlN  2 AlCl3 + Ca3N2

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

5. Double Replacement Reactions
Check your solubility chart…
If your chart reads “I” that means that the compound in insoluble and is a solid precipitate which means you should write (s)
If your chart reads “S” that means that the compound is soluble in water, or aqueous, which means you should write (aq)

6. Double Replacement Reactions
If a gas, water, or precipitate is not formed, the reaction will not take place
Formation of a precipitate
- AgNO3(aq) + NaCl(aq)  NaNO3(aq) + AgCl(s)
Formation of a gas
- FeS(s) + 2 HCl(aq)  2 H2S(g) + FeCl2(aq)
Formation of water
- HCl(aq) + NaOH(aq)  NaCl(aq) + H2O(l)

7. Combustion Reactions
Occurs when a hydrocarbon combines with oxygen gas in the air – burning
Combustion of Propane
C3H8(g) + 5 O2(g)  3 CO2(g) + 4 H2O(g)