At Home: Hang Photos or Paintings. Take 30 minutes to hang up those paintings or photos you've got in the back of your closet or around the house. You'll give your home an inexpensive mini-makeover and burn off an extra 107 calories in the process.
An endothermic reaction or process takes place when the system absorbs heat energy from the surrounding environment. In an exothermic reaction or process, energy is released into the environment, usually in the form of heat, but also electricity, sound, or light.
An example of an exothermic reaction is the mixture of sodium and chlorine to yield table salt. 1  This reaction produces 411 kJ of energy for each mole of salt that is produced: 2  An example of an easy endothermic reaction is dissolving potassium chloride (sold as a salt substitute) in your hand with water.