CHEM 230 Lecture 5: Work and Iso-Terms

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Isothermal q=-w: adiabatic gas 1=0, change in temperature, q=nc t. Intermolecular forces (imf)/covalent or ionic bond: phase change; no change in t. Energy is the potential or capacity to move matter (to do work) Kinetic energy (ke): energy associated with an object by virtue of its motion ke= mv2: temperature reflects the average kinetic energy (increase t, increase ke) Potential energy (pe): energy an object has by virtue of its position in a field of force pe = mgh: associated with phase change (increased imf, decreased pe) Internal energy (u): sum of kinetic and potential energies of particles (u= ke + pe). Internal energy of an isolated system is constant. Law of conservation of energy: total quantity remains constant, only converted from one form to another. Isolated system: no exchange of matter or energy. Internal energy (u: for a closed system, u = q+w.