Gavin Morgan 10/28/2015 Chapter 6 2-Point Notes Energy can take many forms: 1. Energy is defined as the capacity to do work. 2. Energy can take many forms: mechanical energy, heat, sound, electric current, light, or radioactivity. The sun provides energy for living organisms: 1. Energy flows into the biological world from the Sun. 2. Breaking the bonds between atoms requires energy. Oxidation-reduction reactions transfer electrons while bonds are made or broken: 1. During a chemical reaction, the energy stored in chemical bonds may be used to make new bonds.