Use the sticks to stir the cups of water for exactly five more minutes.
Turn off the lights and compare the brightness of the sticks again. Record your observations.
Leave the light sticks in the cups for one hour. Then compare the brightness of the sticks again.
Analyze your data. You can either average the three rankings of each light stick and then compare the averages, or graph the ranks on a line graph.
Terms/Concepts: Heat Energy; Endothermic and exothermic reactions; Chemiluminescence and bioluminescence; What makes fireflies glow?; What makes light sticks glow?