In this Chemistry lab for high school, the classic Iodine Clock Reaction is used to show how temperature and concentration affect reaction rate in a chemical reaction. This is one of the all time most-loved labs because of the sudden, startling change of a mixture from colorless to a deep indigo blue.
Students use their combined class data to construct two graphs, showing the easily recognizable model of the inverse mathematical relationship between temperature and time required for a reaction. It is a wonderfully concrete way to conceptualize this important math/chemistry connection as well as a good opportunity to teach skills in graphing real data.
Easy-to-follow student instructions have been honed over 23 years experience with students performing this lab semi-independently. The student lab fits onto both sides of one sheet of paper. It can be used with either a student-written lab report, or there is room to fill in the data tables if you prefer a fill-in-the-blank format.
To see the teacher notes and answer key with detailed instructions for solution preparation, see the preview. Also included are instructions for collecting class data from student pairs assigned different dilutions and temperatures, so a good scatter of data points can be obtained in one class period.
This comes as an editable Word document and also a PDF file.