CHEM 6B Study Guide - Midterm Guide: Vaporization, Carbon Tetrachloride, Bromine

• School: UCSD
• Department: Chemistry and Biochemistry
• Course: CHEM 6B
• Professor: Andrew Kummel

Document Summary

Process (path): path taken from initial to final state, ex. q and w. Adiabatic: closed system w thermally insulating walls no flow of energy as heat energy can be transferred in form of work. Nonadiabatic: closed system that only permits the transfer of heat. U = q + w = q - p v. Work (w) = -p v, where 1 j = 1 kg m2 / s2. 4184j = 1000 cal = 1kcal = 1 food calorie. Enthalpy of rxn: h = u + pv. Hess" law: enthalpies are additive between reactions, ex. Cyclic process: when heat is released in one direction, absorbed in the other, h. Standard molar enthalpy of formation ( h f): enthalpy change for 1 mol at 1 bar (or 1atm) at. Indicates that one mole lies downhill on enthalpy scale. H f = 0 for h2, o2, n2, cl2, f2, br2, hg(l), na, mg, c, s, fe.