A simulated experiment and animation based on the iodine clock reaction using iodate and iodide in acetate buffers in the presence of arsenious acid and starch.
Type of Material:
Simulation lab experiment
Recommended Uses:
Classroom demonstration to introduce the topic of kinetics and rate laws, as a student tool for prelab preparation, and for use as a virtual lab to collect data and calculate results
Technical Requirements:
Standard computer platform
Identify Major Learning Goals:
To study reaction rates and determine the rate law for the chemical reaction as well as the parameters such as concentration and temperature which control the rate.
Target Student Population:
Advanced high school and College General Chemistry
Prerequisite Knowledge or Skills:
Introductory chemistry course and knowledge of chemical kinetics and oxidation-reduction reactions
Content Quality
Rating:
Strengths:
Very good introductory narrative section giving details of the theory, concepts, equations and calculations involved as well as the objectives of the experiment. The simulated experimental set-up is well-organized and clearly labeled. The animation shows real-time experiments that replicate accurately the experimental procedure of the laboratory. The program is interactive and allows the student to input initial concentration or temperature variables, control the experiment and collect experimental data related to the clock reaction. The simulation is also quite accurate. The software allows user input for the variables involved and simulates the clock reaction clearly.
Concerns:
The concentration range for the reagents is fixed at four possible initial concentration values of 0.05 M, 0.1M, or 0.15 M, but that is the only limitation.
Potential Effectiveness as a Teaching Tool
Rating:
Strengths:
This is versatile enough to be used in a variety of settings in lab, classroom and for individual student learning. The instructions are clear and work as designed. The student can manipulate experimental parameters and see the effects on experimental results. It even be used as a lecture supplement and pre/post laboratory assignment.
Concerns:
None
Ease of Use for Both Students and Faculty
Rating:
Strengths:
The software is easy to enter and use, as well as being easy to navigate and has a consistent layout. Dynamic feedback buttons provide clear clues on the status of the system.
Concerns:
The software does not allow the user to go back and forth from the experimental section to the discussion without using the back button on the browser. One has to exit the entire module and re-launch the module if needed. This can be easily corrected by adding the appropriate link from the experiment screen to the discussion screen. Also some pages contain graphics and videos and therefore may take time to download.
Other Issues and Comments:
This is an excellent learning tool that can effectively enhance student conceptual understanding of reaction rate and activation energy using the iodine clock reaction. It can be used to supplement lecture and laboratory. The student can control experimental conditions and collect data for further analysis.
Creative Commons:
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