DOUBLE REPLACEMENT REACTIONS BY Q, JESSICA, KARLA WHAT IS A DOUBLE REPLACEMENT REACTION? Double Replacement Reaction : A chemical reaction where two reactant ionic compounds exchange ions to form a new product 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) INTERACTIVE QUESTION Find the Product: AgNO3 (aq) + KCl (aq) --> KNO3 (aq) + AgCl (s) 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. 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) 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) 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) INTERACTIVE QUESTION What does Double Replacement involve? A) Exchange of positive ions B) A compound broken down into two products C) Atoms replacing atoms HW QUESTION Find the product of Barium Iodide + Sodium Sulfate?