CHM 114 Lecture Notes - Lecture 5: Electric Potential Energy, Thermochemistry, Exothermic Process
Document Summary
Thermodynamics: the study of energy and its transformation. Thermochemistry: the relationship between chemical reactions and energy changes. Energy (see ppt for definitions: forms of energy, potential energy, most important type is electrostatic potential energy, kinetic energy, ek = 0. 5mv2, electrostatic energy. Units of energy: calorie (cal) vs. joules (j, 1 joule (j) = 1kg*m2/s2, 1 cal = 4. 148 j (water specific heat, 1cal=1000cal=1kcal, not the same as a nutritional calorie (1kcal or cal) Surroundings: e(cid:448)erythi(cid:374)g that lies outside the syste(cid:373) that (cid:449)e"re studyi(cid:374)g. System: the portion the universe we single out to study. We must be careful to state exactly the system contains and what transfers of energy it may have with its surroundings: open system, closed system. Isolates the mass, energy is free to enter and leave: most used system in thermochemistry. Chemical energy: e = w + q, work (w) = force (f)*distance (d, heat (q)
