Card Set Information
Chem 120 Chapter 7
What are the two fundamental kinds of energy?
Potential energy and Kinetic energy.
The water in a reservoir behind a dam, an automobile poised to coast downhill, and a coiled spring are examples of what?
When the water falls over the dam and turns a turbine, when the car rolls downhill, or when the spring uncoils and makes the hands on a clock move, the potential energy in
each is converted to?
The amount of energy that must be supplied to break a bond and separate the atoms in an isolated gaseous molecule is?
Bond Dissociation Energy
Represented by DH, is the difference between the energy absorbed in breaking bonds and that released in forming bonds is?
Heat of Reaction. DH is also known as enthalpy change
A process or reaction that absorbs heat and has a positive DH?
A process or reaction that releases heat and has a negative DH?
Energy can be neither created nor destroyed in any physical or chemical change.
Law of Conservation of Energy
When the total strength of the bonds formed in the products is greater than the total strength of the bonds broken in thereactants, energy is released and a reaction is?
When the total energy of the bonds formed in the products is less than the total energy of the bonds broken in the reactants, energy is absorbed and the reaction is?
A process that, once started, proceeds without any external influence.
The symbol S is used for entropy and it has the unit of cal/mole·K. The physical state of a substance and the number of particles have a large impact on the value of S.