CHEM 103 Chapter Notes - Chapter 4: Chemical Energy, Joule
27 Oct 2016
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Notes, textbook chapter 4, sections 1 & 2. Energy (e) = the capacity to do work. Can be classified as either kinetic or potential. Kinetic energy = the energy that something has because it is moving. Examples: a moving baseball or car (mechanical energy) Motion of electrons through an electrical conductor (electrical energy) Potential energy = energy that something has as a result of its position and some force that is capable of changing that position. Examples: a ball held in your hand (gravitational energy) Energy that particles have to repel or attract each other (electrostatic energy) Energy resulting from attractions and repulsions among electrons and other subatomic particles (chemical potential energy) Potential energy can be converted to kinetic energy and vice versa. Unit of energy = the joule (j) The joule is a relatively small unit of energy, so the kilojoule (kj) is often used. Another energy unit is the calorie (cal)
