CHEM 1953 Lecture 4: Chem Test 4

• School: Temple University
• Department: Chemistry
• Course: CHEM 1953
• Professor: Valentine

Document Summary

Process of achieving motion against opposing forces, force times distance: positive work work done to the system, negative work work is done by the system. Unit: joule 1kgm2/s2: w= -pex v (expansion, w = area under curve, p on y axis, v on x axis, wmax = g. Capacity of a system to do work. U = ke (motion) + potential energy (energy in bonds or nuclear energy) State function: motion: translational (side to side) vibrational (up and down) rotational, equipartition energy is divided over all modes. U = w + q: do work on a system = + u, system does work = - u. Energy transferred as a result of a temporary difference. Unites: joules, old way calories, in food its kcal. Not a state function: q is negative = exothermic, q is positive = endothermic. Systems: open exchange matter and energy with surroundings, closed exchange energy but not matter with surroundings.