• 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