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.
Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and is said to be exothermic. On the other hand if the reaction consumes more energy than it releases then the reaction absorbs heat and is said to be endothermic. Most reactions are exothermic. The amount of heat generated by a reaction can be quantified. The quantity that specifies the amount of heat is known as the enthalpy . If is positive then the reaction is endothermic and if it is negative the reaction is exothermic.