Application
Energy Chemical Reactions Thermodynamics

Theory
The dissolving of ammonium nitrate is endothermic. Heat is drawn away from water that is on a board causing it to freeze and hold the beaker to the board.

Materials
Water Ammonium nitrate Ice cubes

Safety
Wear protective gloves and safety goggles

Demonstration
Wet the bottom of a 250 ml beaker and set it on a waxed board. Fill the beaker with an ice and water mixture. Add ammonium nitrate (about 100 g or more). The solution should get cold enough to freeze the beaker to the board

Disposal
Solution may be poured down the drain and flushed with water.

Reference
California State University, Stanislaus