CHEM 14B Lecture Notes - Lecture 11: Cross-Linked Polyethylene, Enthalpy, Joule
Document Summary
U = internal energy - all the energy in a system ke + pe, all the energy required to create the system (q+w) Pv= energy from surroundings pushing against the system = energy required to make space for the system (molecules were there before system existed, have to move them and keep them out) Oh _out olpv qtwt0 pv qt pexov to pinv for constantpressure pex pin. Pex 0vto pin4 0 at constantv 0u qv. Ohm slope04 0 slope y mxtb m slopes x slope 01ox heat curves are data at constant pressure q. Cm moi combining reactions and clarifying standard reaction enthalpies vs standard enthalpies of formation. Always specify the state of each substance: combustion of methane. 1 select 1 reactant in overall reaction we will choose b. B + a + m + r c + m + r + d h = 60 kj r. Net m + r = 0 so cancel out.
