Excel workshop: Rate law and Activation energy determination

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Presentation transcript:

Excel workshop: Rate law and Activation energy determination Giovanni Cruz

Reaction Rate Disappearance of reactant or appearance of product Dependence of amount of initial reactant A + B  AB rate α [A]p or rate α [B]q or rate α [A]p [B]q or rate α [AB]r rate =k [A]p [B]q p and q are orders for A and B https://www.siliconrepublic.com/discovery/2014/11/11/gigglebit-9-eye-popping-science-experiments-captured-in-gif-form

Reaction Rate https://www.siliconrepublic.com/discovery/2014/11/11/gigglebit-9-eye-popping-science-experiments-captured-in-gif-form www.siliconrepublic.com/discovery/2014/11/11/gigglebit-9-eye-popping-science-experiments-captured-in-gif-form

Specific rate constant (k) rate =k [A]p [B]q Determined experimentally Varies with temperature and catalyst Independent of reactant concentration

Parameters [A] will differ in each reaction Experiment perform at two temperature rate= k [A]p[B]q keeping [B] constant rate= k’ [A]p rate= -Δ[B]/Δt or rate= appearance of [AB]/Δt

Determination of Reaction Order, p, and Rate constants, k’ rate =k’ [A]p log(rate) = log k’ + p log [A] y= b + m x y-intercept = log k’

Activation Energy (Ea) Minimal energy to star a reaction. Arrhenius equation k=Ae-Ea/RT R: Gas constant (8.314 J/mol K) A: collision parameter k: Specific rate canstant http://www.uic.edu/classes/bios/bios100/lectures/enzymes.htm http://chemorphesis.ucsd.edu/catalysis/chemistry.html

Determination of Ea k=Ae-Ea/RT k1/k2 = (Ae-Ea/RT1) /(Ae-Ea/RT2) ln (k1/k2)= - Ea/R (1/T1 – 1/T2) Ea= - [R ln (k1/k2) ]/ (1/T1 – 1/T2)

Experiment Data from the experiment Temperature C° Reaction time (s) Volumes of reactants (mL) http://elderscrolls.wikia.com/wiki/Alchemy_%28Skyrim%29

Data Analysis and calculation

Sorting data

Molarity calculation M1V1=M2V2 M1V1=M2 V2

log [A] cal. rate and log [rate] cal. rate= [B]/s

Set table and add trendline

Arrange and label axis

Determination of Ea

Ea= - [R ln (k1/k2)] / (1/T1 – 1/T2)

Calculation of 1/t1-1/t2

Calculation of ln[k1/k2]

Verifying calculations Ea= - [R ln (k1/k2)] / (1/T1 – 1/T2)

Results