Energy – The capacity for doing work The ability to change matter

Energy Radiant energy – solar energy or electromagnetic spectra energy

Energy Radiant energy – solar energy or electromagnetic spectra energy Thermal energy – energy associated with the random motions of atoms and molecules. (heat energy)

Energy Radiant energy – solar energy or electromagnetic spectra energy Thermal energy – energy associated with the random motions of atoms and molecules. (heat energy) Chemical energy – energy released as a reaction occurs (stored energy in a molecule) (discuss explosions, natural gas etc.)

Energy Radiant energy – solar energy or electromagnetic spectra energy Thermal energy – energy associated with the random motions of atoms and molecules. (heat energy) Chemical energy – energy released as a reaction occurs (stored energy in a molecule) (discuss explosions, natural gas etc.) Potential energy – energy due to position

Energy Radiant energy – solar energy or electromagnetic spectra energy Thermal energy – energy associated with the random motions of atoms and molecules. (heat energy) Chemical energy – energy released as a reaction occurs (stored energy in a molecule) (discuss explosions, natural gas etc.) Potential energy – energy due to position Kinetic energy – energy of motion

Systems System – specific part of the universe that is of interest or being studied Surroundings – everything else

Systems Open system – can exchange mass and energy Closed system – can transfer energy but not mass Isolated system – cannot transfer mass or energy

Energy 1st law of thermodynamics – Energy can be converted from one form to another but cannot be created or destroyed Exothermic – reaction that gives off energy – gets warmer to touch Endothermic – reaction that absorbs energy – gets cooler to touch

Activation Energy (Ea) Energy needed to get a chemical reaction to start