Don't leave endothermic reactions out in the cold—showcase them with this impressive demonstration! Students observe how a reaction between 2 solid compounds absorbs heat from its surroundings and freezes a beaker to a wooden block. They'll be amazed to see the beaker frozen so tightly that lifting the beaker raises the block. This demo requires approximately 10 min of classroom time and materials in the kit are sufficient for the demo to be performed 6 times.