IDENTIFICATION OF CHEMICAL REACTIONS Objective: To identify an “unknown” solution based on it’s physical and chemical properties. Chemical reactions result in the formation of new substances (products) and the exchange of energy (heat, light) The formation of a gas or a precipitate indicates a chemical reaction A new substance might also be recognized by a change in color Pg. 52 of IAN

The Seven Known Solutions Solution No. 1: hydrochloric acid Solution No. 2: sodium carbonate Solution No. 3: sodium hydroxide Solution No. 4: potassium chromate Solution No. 5: calcium chloride Solution No. 6: sodium bisulfite Solution No. 7: copper sulfate

LAB DIRECTIONS: 1.Mix every possible combination of the solutions using 2-3 drops of each in cavities in the Chemplate. 2.Record in the data table: gas, ppt., color, no rxn. 3.Get an unknown. Mix the unknown solution with each of the other solutions. Figure out what the unknown is by comparing with your data (HINT: it is one of the solutions you already tried).

OUTPUT Paste the data table into your IAN. (Record in data table: gas, ppt., color, no rxn.) Write a statement telling how you know what the unknown is: what reaction indications it had and with what other solutions, etc. Use color! Pg. 51 of IAN