The Overhead Oscillating Clock Chemical Demonstration Kit is easily performed on an overhead projector. Simply place a Petri dish on the overhead, add solutions, and mix. Students are captivated due to the colorful, unpredictable changes.
See more product details
(Select option to see volume pricing availability)
Oscillating clock reactions are captivating due to their colorful and unpredictable changes. This variation on a classic is easily performed on an overhead projector. Simply place a Petri dish on the overhead, add three solutions, and mix. In a short while, blue dots appear on an orange background. The blue dots expand, new dots appear, and the dish is filled with concentric blue rings spreading through a sea of orange. The reaction continues for 30 minutes and can be restarted by simply swirling the dish. Teacher Demonstration Notes are included.
Concepts: Oscillating reactions, oxidation–reduction, reaction mechanisms.
Time Required: 30 minutes
Chemicals Provided: Acidified sodium bromate solution, malonic acid solution, sodium bromide solution, ferroin solution.
Correlation to Next Generation Science Standards (NGSS)
Science & Engineering Practices
Analyzing and interpreting data
Constructing explanations and designing solutions
Disciplinary Core Ideas
MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.B: Chemical Reactions
MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.