(©2002, François G. Amar, All rights reserved)

Summary for Week 6

Reading:

For this week: Chapter 5.1-5.4

A look ahead: Finish Chapter 5

Homework problems:

Beginning of Chapter 5: 2, 5, 8, 12, 14, 15,16, 18, 19, 22, 28, 31

End of Chapter 5: 33, 37, 39, 42, 46, 47, 50, 53, 56, 58, 67, 70

Key concepts and equations:

energy, work, and heat

system, surroundings, universe (or system + surroundings = universe)

walls and their properties (see handout)

internal energy change, DE

exothermic and endothermic processes

state function or function of the state of the system

heat absorbed by system, q

work done on system, w, w= -PDV

process variables govern the history of the system

First Law of Thermodynamics, DE = q + w or D E = q - PDV

q_V is the heat absorbed at constant volume, D E = q_V since D V = 0 at constant volume

enthalpy change, DH, is the change in a function of state

D H is defined as D (E + PV)

q_P is the heat absorbed at constant pressure, DH = q_P

enthalpy of reaction, D H_rxn = H(products) - H(reactants)