1. Types of Reactions : Double Displacement LG: I can recognize and predict products of double displacement reactions; I can use a solubility table to determine whether a precipitate is formed

2. Minds On… Draw a particle picture of aqueous sodium chloride How would your picture be different if NaCl was only slightly soluble?

3. Double Displacement A reaction in which the elements in two compounds trade places Example: CuSO4 + NaOH  Cu(OH) 2 + Na 2 SO 4 What products would be formed in the following reaction? KCl + AgNO3  _________ + ___________

4. Applications of Double Displacement Commercial preparation of magnesium is done by isolating magnesium from seawater (which contains magnesium chloride) MgCl 2(aq) + Ca(OH) 2(aq)  Mg(OH) 2(s) + CaCl 2(aq) DD reactions can be used to remove toxic ions (ie. Mercury and copper) from waste water solutions

5. To React or Not to React… In order for a double displacement reaction to occur a NON-AQUEOUS product must be generated. Types of Double Displacement Reactions: – Precipitation (produce a solid) – Reactions that produce a gas (CO 2, NH 3, SO 2, H 2 S) – Neutralization reactions (produce liquid water)

6. Predicting a Precipitate

7. Predicting Products 1)Determine potential products formed (with states) 2)If all products are aqueous, indicate that no reaction occurs CaCl 2(aq) + NaCO 3(aq)  Mg(OH) 2(aq) + HCl (aq)  Na 2 S (aq) + HCl (aq)  NaBr (aq) + CaCl 2(aq)  BaCl 2(aq) + K 2 SO 4(aq) 

8. Solubility Song! http://www.youtube.com/watch?v=EUZoaUU uINk

9. Homework Old Book: Pg. 142 #5, 7abc, 8, 11 New Book: Pg. 177 # 2, 4, 5, 6