1. DOUBLE REPLACEMENT REACTIONS BY Q, JESSICA, KARLA

2. WHAT IS A DOUBLE REPLACEMENT REACTION?  Double Replacement Reaction : A chemical reaction where two reactant ionic compounds exchange ions to form a new product

3. DOUBLE REPLACEMENT REACTIONS The reaction is very similar to “foiling” in algebra. Ex: K 2 SO 4(aq) + Ba(NO 3 ) 2(aq) KNO 3(aq) + BaSO 4(s)

4. INTERACTIVE QUESTION Find the Product:  AgNO3 (aq) + KCl (aq) --> KNO3 (aq) + AgCl (s)

5. PRODUCTS OF DOUBLE REPLACEMENT REACTIONS  In Double Replacement Reactions, 3 reactions must happen to the product  the product could be a precipitate, or a gas that bubbles out of the mixture, or a molecular compound such as water.

6. HOW A PERCIPITATE FORMS IN A DOUBLE REPLACEMENT REACTION One of the products formed precipitates from the solution The other product dissolves into the solution Ex. Na 2 S (aq)+ Cd(NO 3 ) 2 CdS(s)+2NaNO 3(aq)

7. WHAT HAPPENS TO GAS PRODUCTS IN A DOUBLE REPLACEMNET REACTION?  Basically one thing occurs 1. A gas forms from one of the products amd bubbles out of the mixture Ex. 2NaCN (aq)+ H 2 SO 4(aq) 2HCN (g) + Na 2 SO 4(aq)

8. WHAT HAPPENS WHEN A LIQUID FORMS IN A DOUBLE REPLACEMENT REACTION?  This occurs when a molecular compound or water separates from ions in the solution as intact molecules  For example combining solutions of Calcium hydroxide and hydrochloric acid produces water as one of the products Ca(OH) 2(aq) +2HCl (aq) CaCl 2(aq) +2H 2 O (l)

9. INTERACTIVE QUESTION What does Double Replacement involve? A) Exchange of positive ions B) A compound broken down into two products C) Atoms replacing atoms

10. HW QUESTION Find the product of Barium Iodide + Sodium Sulfate?