Post on 17-Dec-2015
transcript
• 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
E
EaA + BC
Time
Exothermic Endothermic
A + B C + Energy
E
EaA + BC
Time
A + B +Energy C