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R2.2.9 Reaction mechanisms (HL) 

Mike Sugiyama Jones
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This video covers how to deduce to the overall equation from the reaction mechanism and also how to deduce the rate expression from the elementary steps.

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8 окт 2020

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Комментарии : 23   
@cheminimallikarachchi
@cheminimallikarachchi 3 года назад
Ty :)
@amanadleshorts7429
@amanadleshorts7429 3 года назад
Nice explanation
@reesesjoyjia
@reesesjoyjia 3 месяца назад
for the question before the last one, why can step 1's reverse rate have NO3 it in but step 2's rate cannot?
@sachinprabhuram5765
@sachinprabhuram5765 3 года назад
Does k1 and k-1 cancel out because they are the same in equilibrium?
@kenzirdab8576
@kenzirdab8576 2 года назад
They are still there they don't cancel out, but they (K1, K-1 and K2) can be simplified in to a new constant (seems confusing cause he uses K2 again). That doesn't matter though as the orders of reaction matches the ones of the expermental one
@idkhahahaha
@idkhahahaha 2 месяца назад
@@MSJChem Isn't k-1 the reciprocal of k1? Or are they the same exact value?
@uncleparry4241
@uncleparry4241 2 года назад
can I just look at the slow step and its coefficients to find the rate?
@MSJChem
@MSJChem 2 года назад
Only if it's the first step.
@uncleparry4241
@uncleparry4241 2 года назад
@@MSJChem oh I get it, if the slow step is the first step, I can just look at that to get the rate. But if the slow step is the 2nd step, I can just look at the overral equation and get the rate.
@MSJChem
@MSJChem 2 года назад
If the slow step is the second step you need to look at the preceding step.
@anonmela
@anonmela 3 месяца назад
Im confused, what is it that we would actually have to do in a question since the ib state that we dont have to propose a reaction mechanism in the current syllabus, could you please help? :)
@SaiKrishna-ys5rs
@SaiKrishna-ys5rs День назад
wait really??? is it for the new '25 exam???
@MSJChem
@MSJChem День назад
First exams 2025: Evaluate proposed reaction mechanisms and recognise intermediates.​ Distinguish between intermediates and transition states, and recognise both in energy profiles of reactions. Include examples where the rate-determining step is not the first step. Proposed reaction mechanisms must be consistent with kinetic and stoichiometric data.
@anonmela
@anonmela День назад
@@SaiKrishna-ys5rs idk I was 2024 I’m glad it’s all in the past, but good luck and listen to king MSJchem
@LloydJackson-bx1zc
@LloydJackson-bx1zc 3 месяца назад
Why is the rate expression [NO2]2 if you ignore the intermediates? wouldn't it be first order?
@MSJChem
@MSJChem 3 месяца назад
You have to include the O2 in step 1.
@LloydJackson-bx1zc
@LloydJackson-bx1zc 3 месяца назад
@@MSJChem For the reaction at 5:37?
@MSJChem
@MSJChem 3 месяца назад
@@LloydJackson-bx1zctwo reactant particles is bimolecular
@LloydJackson-bx1zc
@LloydJackson-bx1zc 3 месяца назад
@@MSJChem oh right so you don't remove it even if it is an intermediate?
@MSJChem
@MSJChem 3 месяца назад
NO3 is the intermediate.
@anonmela
@anonmela 3 месяца назад
So does that mean we can tell the order with respect to something based on if the slow step is uni or bimolecular?
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