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302 Exam 2 Review Sheet

# 302 Exam 2 Review Sheet - Review Sheet Exam 2 CH302 Quy...

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Review Sheet – Exam 2 – CH302 – Quy Textbook Chapters for Exam 2: Chapter 10 sections 9, 10 & 11, Chapter 7, sections 1 - 7 Background Material: Most of the topics of Exam 2 simply build on material from Exam 1: Solutions, chemical equilibrium, thermodynamics, and general problem solving techniques. Brush up on that material. Chapter 10 Spontaneity, Entropy, and Free Energy Know how to write a mass action expression for a given reaction. At equilibrium it will be equal to the equilibrium constant for the reaction. Know how the value of K is changed when a reaction is reversed, doubled, halved, etc. Know when the mass action expression is called a reaction quotient Q (at starting conditions) and when Q is equal to the equilibrium constant K. Know the “less than” rule: Q < K, shift to the right. K < Q, shift to the left (shift away from Q! in each case.) If K = Q, starting position is already at equilibrium. Review Le Chatelier’s principle in order to predict how a system will react when stressed by concentration, pressure, or temperature changes. Know the general concept of what it means to have a spontaneous process. The second law of thermodynamics states: in any spontaneous process there is always an increase in the entropy of the universe. Know the meaning of entropy changes we discussed: rotational, vibrational, spatial (positional probability) degrees of freedom, volume and pressure entropy trends, phase entropy trends, particle count entropy trends. You should know basic relationships between free energy, enthalpy and entropy.

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302 Exam 2 Review Sheet - Review Sheet Exam 2 CH302 Quy...

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