1. Daily Science January 13 Predict the products of the following reactions and balance them:  C 3 H 8 + O 2   Sodium and nitrogen react  Calcium Fluoride decomposes when heated  Fe (II) + Na 3 PO 4   Sodium chloride reacts with magnesium bromide 

2. PG. 69 Reactions in Aqueous Solutions

3. Net ionic equations In double replacement reactions, not all ions participate in the reaction Double replacement reactions result in the formation of a precipitate Ions that don’t participate are called spectator ions Can write equations to show which ions participate Called net ionic equations

4. Rules for writing net ionic equations 1. Write out the equation and separate all the ions with their charges 1. Be sure to include the state of matter for each ion 2. Everything that is aqueous is separated 3. Solids, liquids, and gases stay in their respective compounds 4. If water is produced, it is not split up 2. Cross out ions that are seen in both the reactants and products. 3. Rewrite the equation to include only the ions that participate in the reaction

5. Practice problems Aqueous solutions of potassium iodide and silver nitrate are mixed forming the precipitate silver iodide Aqueous solutions of aluminum chloride and sodium hydroxide are mixed forming the precipitate aluminum hydroxide.