Need access to water, ice, electricity, blender, and centrifuge. Soapmaking Journal Staff, J. Chem. Maybe No Messy. M NaOH must be prepared. Need access to water and heat.
Soap takes some time to harden and become less basic.
The Effects of Temperature on Lightsticks Journal Staff, J. Chem. Yes Maybe Need access to water, hot water, and ice. Demo can be set up in insulated cups and will last for hours. An Introduction to Spectroscopy Journal Staff, J. Chem. Can be difficult to measure and cut cardboard for spectroscope.