CHE116_Lecture3_2011

CHE116_Lecture3_2011 - Chemistry Chemistry116 Lecture3 Topics Concentrationvs.time TemperatureandRate Chapter14.414.5 Announcements Homework# are

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hemistry 116 Chemistry 116 Lecture 3 Topics: Concentration vs. time Temperature and Rate Chapter 14.4 14.5
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Announcements “Introduction to MasteringChemistry” and omework #1” on asteringChemistry e “Homework #1” on MasteringChemistry are due this Friday (01/28/11) at 11:59PM. If you registered your iClicker last semester, then you should be all set for the current semester as well.
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Chemical Kinetics In kinetics we study the rate at which a emical process occurs chemical process occurs. Besides information about the speed at hich reactions occur kinetics also sheds which reactions occur, kinetics also sheds light on the reaction mechanism (exactly ow e reaction occurs how the reaction occurs). Chemical reactions span a wide range of time scales.
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ctors That Affect Reaction Rates Factors That Affect Reaction Rates Physical State of the Reactants Better mixing = faster rate oncentration of Reactants Concentration of Reactants Higher concentration = faster rate mperature Temperature Higher temperature = faster rate Presence of a Catalyst Catalyst = faster rate
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ate Laws Rate Laws A rate law shows the relationship between the action rate and the concentrations of reaction rate and the concentrations of reactants. The exponents tell the rder f the reaction e epoet s te ode o eact o with respect to each reactant. For example, if the rate law is: p, Rate = k [NH 4 + ] [NO 2 ] en the action : then the reaction is: First order in [NH 4 + ] and rst rder [NO First order in [NO 2 ].
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Rate Laws Rate = k [NH 4 + ] [NO 2 ] eneral form for rate = ] ] General form for rate = k [A] m [B] n The overall reaction order can be found by adding the exponents on the reactants in the rate law. This reaction is second order overall (m + n = 1 + 1 = 2). The values of these exponents must be determined experimentally not theoretically.
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Rate Laws and Time Rate laws that tell us the rate of reaction based on the relationship between the reactant concentrations and the rate constant. hat about the relating the reactant What about the relating the reactant concentrations and time ? We can rearrange the rate laws in such a way as to provide concentration information as a t i f ti function of time.
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Rate Laws and Time A first order reaction is one where the rate epends on the concentration of a single reactant Rate =
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This note was uploaded on 02/10/2011 for the course CHE 116 taught by Professor Staff during the Spring '08 term at Syracuse.

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CHE116_Lecture3_2011 - Chemistry Chemistry116 Lecture3 Topics Concentrationvs.time TemperatureandRate Chapter14.414.5 Announcements Homework# are

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