chemical kinetics
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The art of balancing equations in chemistry!
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Professor Sylvia Ceyer discusses bond enthalpy and the enthalpy of endothermic/exothermic chemical reactions. The heat of formation is defined as Professor Ceyer explains Hess's Law which is used to predict the enthalpy change and conservation of energy, regardless of the path through which it is to be determined. The lecture concludes with a discussion of thermodynamics and spontaneous chance, specifically Gibbs free energy and the concep...more
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Environmental Politics and Law (EVST 255) The lecture critiques the U.S. Green Building Council's (USGBC) certification system, LEED (Leadership in Energy and Environmental Design). The criteria for being highly rated under LEED emphasize energy efficiency and minimizing waste, but do not prioritize environmental health and limiting use of dangerous plastics and chemicals. USGBC is a non-profit organization, not a government agency, and...more
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Professor Sylvia Ceyer discusses the nature of chemical equilibrium as it relates to free energy, the reaction quotient, and the relationship between K and Q. The meaning of K is further clarified and the external effects on K are identified, from adding and removing reagents to changes associated with the Principle of Le Chatelier.
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Professor Sylvia Ceyer continues her discussion on chemical equilibrium and external effects such as a change in volume, adding inert gas, and a change in temperature. Parameters are set for maximizing the yield of a reaction, and the Principle of Le Chatelier's is returned to. Hemoglobin is used as an example involved in a series of equilibrium reactions in response to oxygen pressure.
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Professor McBride begins by using previous examples of "pathological" bonding and the BH3 molecule to illustrate how a chemist's use of localized bonds, vacant atomic orbitals, and unshared pairs to understand molecules compares with views based on the molecule's own total electron density or on computational molecular orbitals. This lecture then focuses on understanding reactivity in terms of the overlap of singly-occupied molecular orbit...more
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Environmental Politics and Law (EVST 255) The change from smaller, more diverse farms to larger single-crop farms in the US has led to greater reliance on pesticides for pest management. Other changes as the US food system becomes more commercialized include: increased use of additives, higher food prices, more water and energy consumption for agriculture, and more pesticide residues entering food through processing. Pesticides have als...more
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Half a century before direct experimental observation became possible, most structures of organic molecules were assigned by inspired guessing based on plausibility. But Wilhelm Körner developed a strictly logical system for proving the structure of benzene and its derivatives based on isomer counting and chemical transformation. His proof that the six hydrogen positions in benzene are equivalent is the outstanding example of this chemical...more
