Week 1- Reaction Rate
Popular in General Chemistry II
verified elite notetaker
Popular in Department
This 3 page Class Notes was uploaded by BettyAnn Mead on Friday January 23, 2015. The Class Notes belongs to 112 at University of Massachusetts taught by Voigtman in Spring2015. Since its upload, it has received 177 views.
Reviews for Week 1- Reaction Rate
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 01/23/15
Chemistry 112 time 01212015 Chemical Kinetics Two Important Aspects of Reactions 0 What is the reaction rate 0 To what extent is the reaction product favored Example 2Na 2H20 l 2Na 20H H2 Qualitatively this reaction goes at a reasonable rate but we need QUANTITATIVE For this measure 0 Loss of Na mass unit time Loss of H20 mass unit time Change in Na unit time 0 Change in VH20 or PH20 unit time 0 Change in OH unit time Rate of something something time o A reaction rate is a measured change molar concentration time in this chapter Beers Law 0 A EbC o A Absorbance o A Wavelength o c Concentration o b Length of particles Rate of reaction The absolute value of the change in concentration Rate of reaction is ALWAYS greater than or equal to zero For this measure 0 Average rate FinalInitial Final tInitial t Instantaneous rate dN205 dt l Tangent slope of curve at a certain time 0 Initial rate dN205 dt at t0 From the N205 vs t graph N205 decreases with time 0 Not a constant decrease curve Rate of reaction dN205 dt quotmust be pos quot xes it quotnegative Rather than measuring N205 we could measure N02 or 02 0 But in the time required for 2 moles of N205 to be consumed 4 moles of N02 and 1 mole of 02 is produced 0 MOLE RATIO aAbBjcCfF What factors in uence reaction rate Reactant concentration 0 Temperature CatalystsEnzymes Surface area of a solid or liquids not dissolved in solution How do reaction rates depend on T o This is going to be expressed in a rate equation 0 In general for uncatalyzed reaction aAbBjxX Rate of reactionkAquotxBquoty In general x and y will not equal a and b DO NOT just look at the balanced equation Homeogeneous Catalyst o aAbBxX o ratekAquotxBquotyCquotz Reaction Orders 0 Assume RatekAquotxBquotyCquotz 0 Then 0 X is reaction order for Al 0 Y is reaction order for Al 0 Z is reaction order for Al XYZOvera Order Zero Order for Al RatekAquot0k Ratek First Order for Al 0 RatekAquot1kA RatekA Second Order for Al RatekAquot2
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'