![]() One example is the oxidation of iron in air. ![]() For isochoric processes, you must determine the Helmholtz free energy to know which way a reaction is driven. ![]() For isobaric processes, you much determine the change in Gibbs free energy for the reaction to know which way it is driven. For example, an electron of hydrogen may have higher entropy if it drifts from the core proton but the electrostatic forces (and quantum mechanics) energetically keep it bound to the atom. A system's favorability to release energy (enthalpy) competes with entropy. At which point the entropy of the system (the contents of the freezer) decreases, however the electrical energy needed to be produced to power the freezer such as coal (burning a solid to a gas) and heat was wasted by the freezer in the process both of which create larger amounts of entropy than was reduced in the system by the freezer.įor chemical processes entropy can be a great driver of many reactions but it is not absolute. The freezer will utilize the electrical energy coming in to pump heat from the water until it becomes a solid (ice). One example is a freezer with a cup of liquid water in it.
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