Reaction Rate Labettini

1. Reaction Rate Labettini PURPOSE: • To demonstrate factors that affect reaction rate • To confirm that reaction rate is determined by rate of collisions between atoms or molecules MATERIALS: • Pipette & 10 ml grad cylinder • 50 ml beaker with copper chloride solution & pipette • 50 ml beaker with water • Test tube rack, test tubes (2), stir stick • 4 pieces of aluminum foil — similar in size • Timer • Add 6 ml CuCl4 to one test tube. Place test tube in hot water bath.

2. Reaction Rate Labettini DATA TABLE: CONTROL: • Slip aluminum foil strip into test tube • Add 6 ml of CuCl4 and start timer • Stop timer when reaction is complete • Record time in table as “Control” • Dump test tube in orange bucket & rinse at sink PROCEDURE 1: Effect of concentration • Repeat, but add 3 ml H2O first, then 3 ml CuCl4 • Record in table as “Low Concentration”

3. Reaction Rate Labettini PROCEDURE 2: Effect of surface area • Roll foil into very tight ball & drop into test tube • Use grad cylinder to add 6 ml of CuCl4 and start timer • Stop timer when reaction is complete • Record time in table as “Low Area” PROCEDURE 3: Effect of temperature • YOU WILL NEED TO WORK QUICKLY • Put foil in empty test tube • Retrieve hot CuCl4 • Pour into first test tube, and start timer • Stop timer when reaction is complete • Record time in table as “High Temperature”

4. Reaction Rate Labettini • QUESTIONS: • Explain why reducing the concentration slows down the reaction. Be sure to refer to collisions of molecules. • Explain why reducing the surface area slows down the reaction. Be sure to refer to collisions of molecules. • Explain why increasing the temperature speeds up the reaction. Be sure to refer to collisions of molecules.