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Carolina Investigations® for Use with AP® Chemistry: Factors Affecting Reaction Rates Kit

Item # 840590 Exclusive This product is exclusive to Carolina Biological Supply.

Investigate factors that affect reaction rate using the iodine clock reaction. Change temperature, concentration, and surface area of solid reactants and add a catalyst to observe changes in reaction rates. The iodine clock reaction provides an easy visual cue to measure reaction times. Reaction rates are explained using physical phenomena, such as molecular collisions. Materials are sufficient for 30 students in teams of 3.



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Investigate factors that affect the rate of a reaction using the iodine clock reaction. Teach this laboratory experience using either the guided activity or inquiry activity. In the guided activity, students measure how quickly clear, colorless solutions of reactants turn deep blue when the temperature, concentration, and surface area of solid reactants are changed. The change in reaction time when a catalyst is added is also determined. In the inquiry activity, students design an experiment to determine the effect of changing temperature, concentration, surface area of solid reactants, and the presence of a catalyst on the rate of the iodine clock reaction. The inquiry activity provides an opportunity for students to present their experiment design and results, reinforcing the practice of communicating findings. Detailed preparation and procedure notes guide the teacher through leading a successful inquiry exercise, including a suggested rubric for assessing student performance.

Both activities include assessment questions that follow the format of the AP® Chemistry Exam free-response questions. In the assessment, students draw an energy diagram to show how a catalyst lowers activation energy and predict how changes in concentration and reactant surface area will affect the reaction rate of a single replacement reaction in aqueous solution. Students also predict the effect of increasing pressure on the reaction rate of 2 gases. To answer these questions, students reference physical models, such as the increased number of collisions of molecules with increased temperature.

Provides the following AP® Chemistry experiences: design a procedure to collect data, analyze data, explain phenomena based on physical evidence, and make predictions about natural phenomena based on scientific models. The use of the iodine clock reaction gives this experiment visual interest and a precise way to measure reaction rate. Materials are sufficient for 30 students in teams of 3. Digital teacher's manual, included FREE with kit purchase, is a 12-month eBook license to the Factors Affecting Reaction Rates teacher's manual. You can also access the digital student guide for this kit for free at Carolina Science Online®.

AP® is a trademark registered and/or owned by the College Board®, which was not involved in the production of, and does not endorse, these products.

  • This item is only available from Carolina Biological Supply Company.
Components Qty Included?
0.5 M Potassium Iodide, 250 mL 1 Included
0.1 M Hydrochloric Acid, 250 mL 1 Included
0.01 M Sodium Thiosulfate, 250 mL 1 Included
0.001 M Copper (II) Sulfate, 30 mL 1 Included
Starch, 5 g 1 Included
Hydrogen Peroxide, 3%, 473 mL 1 Included
Potassium Iodide, 10 g 1 Included
Syringes, 1 mL 10 Included
Teacher's Manual and Reproducible Student Guide 1 Included
24-well Microplates 10 Needed, Not included
Graduated Cylinders,10 mL 10 Needed, Not included
Graduated Cylinders, 50 mL 5 Needed, Not included
Graduated Cylinder, 100 mL 1 Needed, Not included
Beakers, 50 mL (or small plastic cups) 50 Needed, Not included
Beakers, 150 mL 30 Needed, Not included
Beakers, 400 mL 2 Needed, Not included
Test Tubes, 13 x 100 mm 100 Needed, Not included
Test Tube Tongs 10 Needed, Not included
Stopwatches 10 Needed, Not included
Disposable Pipets 40 Needed, Not included
Hot Plates 10 Needed, Not included
Balances (accurate to 0.001 g) 10 Needed, Not included
Containers of Crushed Ice 10 Needed, Not included
Thermometers 10 Needed, Not included
Mortars and Pestles 10 Needed, Not included
Chemical Scoops 10 Needed, Not included
Small Weigh Boats 30 Needed, Not included
Stir Plate (with magnetic stir bar) 1 Needed, Not included
Deionized or Distilled Water Needed, Not included
Paper Towels Needed, Not included