ThermochemistryA series of free High School Chemistry Video Lessons from Brightstorm.
Spontaneous Processes Spontaneous processes are reactions which proceed without requiring an input of energy because the products are at a lower, more stable energy state than the reactants. Spontaneous processes often require activation energy, but do not require a prolonged input of energy.
Heat of Formation Heat of formation is the change in enthalpy when one mole of a compound is formed at 25 degrees Celsius and 1 atm from its elements. Heat of formation has been measured in labs and recorded so that we can look it up when we need it.
Gibbs Free Energy Gibbs Free Energy is a concept invented to create a thermodynamic relationship between enthalpy and entropy. It is most frequently used with the equation gibbs free energy = enthalpy - (entropy)(temperature).
Heat of Fusion - Heat of Vaporization Heat of fusion is the energy needed for one gram of a solid to melt without any change in temperature. Heat of vaporization is the energy needed for one gram of a liquid to vaporize (boil) without a change in pressure. These energies are needed to break apart the intermolecular forces holding the solid or liquid together as it enters a less dense state of matter.
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