Interesting chemical reactions don’t necessarily require a chemistry lab and expensive glassware. For example, you can experience an exothermic chemical reaction using nothing more complicated than a handful of laundry detergent powder and a bit of water. An exothermic reaction is one which produces heat as chemical bond energy is converted into thermal energy. Experience the phenomenon the next time you are washing clothes. Grab a handful of powered or solid detergent and let a little water dampen it before adding it to the washer. You’ll feel the heat using dry dishwashing detergent, too. Be sure to rinse your hands well afterward.