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For each of the following reaction diagrams, estimate the activation energy $(E_{{a}})$ of the reaction:
A. 25 $\mathrm{kJ}$B. $[10 \mathrm{kJ}]$
00:59
Rikhil M.
Chemistry 102
Chapter 12
Kinetics
Carleton College
University of Kentucky
Brown University
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Hi there. In this question, we have to reaction diagrams that they're asking us to read. So basically, let's just talk about reaction diagram for a moment. Basically, a reaction diagram shows you the initial energy of their act INTs, then the energy that needs to be added to start the reaction. And then it will show what happens to the energy as the reaction proceeds and we'll end up with the energy of the products. So we have reactant here products down here and appear at the top of the peak. That is the transition state or the activated complex. Yeah, but this hill here is the activation energy, the energy that must be added to start the reaction. So that's typically given the symbol e subscript a the activation energy. Um, you can think of it almost like the like. If you were trying to push a rock trying to get a rock to the other side of the hill, a large boulder, you would have to put energy in it to push it up the hill. Once that boulder gets to the top of the hill, now it can roll down the other side of the hill all right. So that's the way that you can think of activation energy. It's the energy you need to put in to get that reaction started. So from these diagrams, we are going to see energy on the Y axis, and that is in killer jewels. And on the X axis is the extent of the reaction on the X axis. So this question is just asking us to estimate the activation energy. So in other words, we just need to look at the y axis and determine what the changes between where the reactant SAR and where the top of that little Hillis. So in part a, the highest point looks to me like it is 35 killer jewels and the reactant started out at 10 killed jewels. Therefore, 35 minus 10 gives us an activation energy of 25 gila jewels for RS sub. All right, so we're really just reading a graph here. We just need to know what part to read. So let's look at part B. Part B. First thing we notice is there is less activation energy required here because the activation energy on Lee goes up to 20 killer jewels and the reactant since our again starting at 10. So our activation energy for this reaction is only 10 killer jewels. BR activation energy for part meat. Okay. Thank you so much for watching.
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