CHEM 201 Lecture Notes - Lecture 24: Exothermic Process, Enthalpy, Sodium Chloride
Document Summary
Energy is the capability to do something having energy means that things are possible, but does not necessarily ensure that they will happen. S=klnw: w=number of options which are accessible given some amount of thermal energy in the system, k=boltzmann constant: 1. 381x10-23j/k. Energy of moving through space at some velocity. Energy associated with the springiness of bonds and of bond angles. Energy of electrons in the orbitals of atoms. Entropy, quantitatively: enthalpy (h) and internal energy (u) takes energy units of j"s and kj"s while entropy (s) takes units of. J/k, which reflects its connection to temperature: unlike enthalpy and internal energy, the actual values of entropy are measurable, pure substance. Entropy: all pure substances by themselves have positive values, can be negative or positive for a solute. Enthalpy: can be positive or negative for different substances, zero for reference elements.
