CHEM 341 - Physical Chemistry (Fall Semester, 2000)
Meeting Times and Places
Course Instructor: Dr. Fred Richardson, (Phone: 924-3905; email: fsr@virginia edu)
General Nature of the Course
CHEM 341 is an introductory physical chemistry course that focuses largely on the thermodynamic properties of chemical systems (under equilibrium conditions) and on phenomenological descriptions of chemical reaction rate processes. The material presented in the course assumes that students have a solid background in general chemistry, a rudimentary knowledge of elementary physics, and a familiarity with differential and integral calculus.
The first part of the course focuses on the basic concepts, principles, and laws of classical thermodynamics, with emphasis on formulations and operational definitions most relevant to chemical systems and chemical processes. These concepts, principles, and laws are then applied to a variety of systems, processes, and properties that are routinely encountered in studies of chemical phenomena. Measurements of thermodynamic properties, characterization of thermodynamic states, and physical and chemical transformation pathways between thermodynamic states are illustrated and discussed. In CHEM 341, our treatment of chemical thermodynamics will be confined largely to classical (or phenomenological) formulations, which make no assumptions about the detailed structural and energetic properties of the constituent molecules in the bulk systems of interest. In CHEM 342 (the follow-on course to CHEM 341), chemical thermodynamics will be reformulated, using the methods of statistical mechanics, to show how the thermodynamic properties of bulk (macroscopic) systems may be rationalized in terms of molecular structural details and energetics.
The second part (actually the last one-third) of CHEM 341 deals with chemical reaction kinetics. Emphasis is placed on phenomenological rate laws, analyses and interpretations of these rate laws in terms of reaction mechanisms, and relationships between reaction rate parameters, molecular structure and energetics, and experimental variables such as temperature, pressure, and reaction space (or volume). The collision theory and transition-state (or activated-complex) theory of chemical reactions will be discussed at a semi-quantitative level, but only cursory attention will be given to the detailed molecular structural dynamics (and energy transformations) involved in chemical reactions.
Essential to 'learning' physical chemistry are problem-solving exercises that illustrate connections between theory and experimental observation and measurement. In some cases, these exercises require applications of theoretical concepts and mathematically formulated relationships and models to the analysis and interpretation of experimental data. In other cases, they require the use of theory and calculations to predict the properties and behavior of systems not yet subjected to experimental study, or to predict the outcome of experiments being planned. Working problems in physical chemistry nearly always involves a combination of qualitative reasoning and quantitative calculations, and in many cases an essential part of the problem solving involves finding (or deriving) mathematical relationships appropriate for use in carrying out the calculations of interest. One of the characteristic features of physical chemistry is the extensive use of mathematics and mathematically formulated models to codify and relate in succinct, compact terms the findings obtained from multiple experimental observations and measurements, to express in explicit functional form the interdependencies of various physical and chemical properties (for static systems and for systems undergoing physical or chemical changes), and in some cases to show connections between the microscopic and macroscopic properties of a system. One cannot 'learn' physical chemistry without developing some understanding of, and a facility for using, its mathematical models and formulations. Problem-solving exercises provide the best means for doing that.
The textbook for this course includes many illustrations of problem solving and many examples of worked problems in each chapter. It also gives extensive sets of exercises and problems (at the ends of chapters) that may be used to practice your problem-solving skills and, in the course of doing that, also enhance your understanding of physical chemistry. Solutions to approximately one-half of the end-of-chapter exercises and problems are given in the Student's Solution Manual, which is available for purchase from the University Bookstore. You are encouraged to work as many of these exercises and problems as you can find the time to do. A subset of exercises and problems (chosen from among those not worked out in the Student's Solution Manual) may be assigned as out-of-class work to be handed in and graded.
It is anticipated that problem-solving exercises will be the main focus of the twice-weekly Discussion/Problem Sessions scheduled for this course. However, that need not be the case if the majority of students who attend these sessions would rather spend more time on questions and issues that arise (but are not satisfactorily resolved) during the regular class lecture periods. The format and content of the Discussion/Problems Sessions will be guided by student needs and preferences.Graded Work
Course grades will be determined on the basis of performance on seven graded problem-set assignments (done as homework), two 105 min. in-class exams, and a 3 hr. final exam. Final course grades will reflect the following (approximate) contributions from the graded problem sets and exams:
(Some small adjustments to these weightings might become necessary, in which case I will let you know long before the semester ends.)
All work handed in for grading (including that done on problem sets, as well as exams) must carry a pledge that the work is entirely your own and was done without any collaboration with other persons (except for possible advice or guidance from the CHEM 341 course instructor). In doing the problem-set assignments you may consult any books or other (inanimate) reference material you wish.