General Chemistry Spring 2009

In this lecture we began by looking at what happens when water freezes. We then continued our discussion by reviewing types of solids. We then discussed different types of crystal systems solids can have. We focused on the cubic system and discuss simple cubic, body-centered cubic and face centered cubic. We looked at each of the unit cells for these systsms and discussed the relationship between edge length and atomic radisu. Near the end of class we did a sample calculation of a problem based on a cubic system..

In this lecture we began by looking at what happens when water freezes. We then continued our discussion by reviewing types of solids. We then discussed different types of crystal systems solids can have. We focused on the cubic system and discuss simple cubic, body-centered cubic and face centered cubic. We looked at each of the unit cells for these systsms and discussed the relationship between edge length and atomic radisu. Near the end of class we did a sample calculation of a problem based on a cubic system..

In this lecture we began by recognizing the top scores on Exam I. We did one more sample problem doing calculations with unit cells and density. We then continued our discussion of solids by talking about ionic compounds. We looked at the cesium chloride structure and the sodium chloride structure. We talked about cubic holes (CsCl structure) and octahedral holes (NaCl structure). We looked at diamond and recognized the face-centered cubic structur of carbon atoms, and then discussed the tetrahedral holes occupied by four additional carbon atoms,

In this lecture we began with an inclass activity. We started discussing solutions. We covered solutions by beginning with important definition. From the perspective of phases we mentioned the morst important solutions. We looked at a video of the formation of asolution and talked about how we would describe the solution. We looked at several macroscopic examples of homogeneous (solutions) and heterogeneous mixtures. We talked about the importance of intermolecular attractive forces in predicting whether a mixture will be homogeneous or heterogeneous. We also looked at a particulate level representation of solutions. We continued our discussion of important terms in the solution process from the particulate level perspective.

In this lecture we began discussing ACA#8 and mentioning the importance of explaining why particular mixtures are homogeneous or heterogeneous. Rules are not explanations. We reviewed the solution process and the kind of explanation needed for heterogeneous or homogeneous mixtures. Next we did a brief review of writing the products for a double replacement reaction and writing the ionic and net ionic equations. We did a brief introduction to colligative properties, and discussed how the concentration of particles is important. We then discussed four important ways of expressing concentration: weight %, molarity, mol fraction and molality. We ended the class by doing a problem using the four concentration definitions.

Exam I from Spring 2008 CHEM 1515

Exam II from Spring 2008 CHEM 1515

Exam III from Spring 2008 CHEM 1515

Exam IV from Spring 2007 CHEM 1515

In today's class we continued our discussion of Chemical Kinetics. We used the method of initial rates to determine the order of a reaction with respect to the reactants, and to calculate the rate constant for the reaction. We then discussed simple reactions and the integrate rate laws for reactions that follow first order and second order kinetics. We also discussed plotting ln[] versus time and 1/[] versus time to determine the order of the reaction and to calculate the rate constant..