1. Double Displacement Reactions

2. Reactants: Zn + I 2 Product: Zn I 2

3. Double Displacement Reactions: At the conclusion of our time together, you should be able to: 1.Define molecular dd equations 2.Write molecular dd equations 3. Identify the difference between a neutralization and precipitation reaction 4. Realize that dd is one of the 5 basic types of chemical reactions

4. Double Replacement Reactions Double Replacement Reactions occur when a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compound Double Replacement Reactions occur when a metal replaces a metal in a compound and a nonmetal replaces a nonmetal in a compound Compound + compound  compound+ compound Compound + compound  compound+ compound AB + CD  AD + CB AB + CD  AD + CB

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

6. 3 Driving Forces for Double Replacement Reactions Water Forms Gas Forms Solid Forms If one of the above is not a product, there will be no reaction.

7. Practice Predict the products. Balance the equation Predict the products. Balance the equation 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)  7. Ba(NO 3 ) 2(aq) + K 2 CrO 4 (aq)  8. Demo Time!! AgCl + HNO 3 NaCl + Ca 3 (PO 4 ) 2 Ba(NO 3 ) 2 + PbCl 2 NaCl + Fe(OH) 3 Na 2 SO 4 + H 2 O Cu(OH) 2 + K 2 SO 4 BaCrO 4 + KNO 3

8. Solubility Table

9. Solubilities Not on the Table! Gases will only slightly dissolve in water Gases will only slightly dissolve in water Strong acids and bases dissolve in water Strong acids and bases dissolve in water Hydrochloric, Hydrobromic, Hydroiodic, Hydrochloric, Hydrobromic, Hydroiodic, (All Binaries) (All Binaries) Nitric, Sulfuric, Perchloric Acids Nitric, Sulfuric, Perchloric Acids (Ternary Acids with 2 more O than H) (Ternary Acids with 2 more O than H) Group I hydroxides Group I hydroxides Water slightly dissolves in water! (H+ and OH-) Water slightly dissolves in water! (H+ and OH-)

10. Practice of DD Molecular Equation: K 2 CrO 4(aq) + Ba(NO 3 ) 2(aq)  BaCrO 4(s) + 2 KNO 3(aq) BaCrO 4(s) + 2 KNO 3(aq) Soluble Soluble Insoluble Soluble Soluble Soluble Insoluble Soluble

11. Neutralization Reaction Acid + Base  Salt + Water Molecular Equation: HCl + NaOH  NaCl + H 2 O SolubleSoluble Soluble Molecular SolubleSoluble Soluble Molecular

12. Double Displacement Reactions: Let’s see if you can: 1.Define molecular dd equations 2.Write molecular dd equations 3. Identify the difference between a neutralization and precipitation reaction 4. Realize that dd is one of the 5 basic types of chemical reactions

13. Practice Quiz Write the molecular equation and balance: Silver nitrate reacts with calcium chloride Write the molecular equation and balance: Silver nitrate reacts with calcium chlorideMolecular: AgNO 3 + CaCl 2  AgCl + Ca(NO 3 ) 2 Balanced: 2AgNO 3 + CaCl 2  2AgCl + Ca(NO 3 ) 2

14. I don’t feel so stupid now…