14.3 Reaction Mechanisms, Catalysts, and Reaction Coordinate Diagrams | General Chemistry

Chad provides a comprehensive lesson on Reaction Mechanisms, Catalysts, and Reaction Coordinate Diagrams. The lesson begins with an introduction to reaction mechanisms which are a the sum of a variable number of elementary reactions. These elementary reactions are identified as either unimolecular, bimolecular, or termolecular depending upon how many reactant molecules there are. It is then explained how to identify intermediates and catalysts in a reaction mechanism. Finally, it is demonstrated how to determine the rate law of a reaction from the mechanism.
A comprehensive description of a catalyst is then provided along with a reaction coordinate diagram. Delta H, transition state(s), intermediate(s), and the activation energy in both the forward and reverse reactions are identified on the reaction coordinate diagrams.
I've embedded this playlist as a course on my website with all the lessons organized by chapter in a collapsible menu and much of the content from the study guide included on the page. Check this lesson out at www.chadsprep.com/chads-gener...
If you want all my study guides, quizzes, final exam reviews, and practice exams, check out my General Chemistry Master Course (free trial available) at www.chadsprep.com/genchem-you...
00:00 Lesson Introduction
00:42 Reaction Mechanisms and Elementary Reactions
04:50 How to Identify Intermediates and Catalysts in Reaction Mechanisms
07:28 How to Determine the Rate Law from a Reaction Mechanism
24:54 Characteristics of Catalysts
29:24 Reaction Coordinate Diagrams
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[@carapencak9502]

God bless you, Chad. What you are doing with your chemistry lessons is truly a gift to the rest of us

[@ChadsPrep]

Kind words - thank you and Happy Studying!

[@siemabraham9653]

Such a helpful video. You're a very underrated teacher on this platform.

[@ChadsPrep]

Great to hear you found this helpful Siem!

[@Vickyiyke]

You make chemical kinetics so easy. Thank you very much.

[@ChadsPrep]

You're welcome!

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[@ChadsPrep]

Thanks from USA - Happy Studying!

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Amazingly lucid!!! THANK YOU for sharing your gift!

[@ChadsPrep]

You're welcome, Tomas B!

[@user-ic6gp3ie1b]

I loved your analogy where you compared rate limiting steps to a relay race with your son! Very cute and effective at getting the point across. Thanks for being high energy in your lessons; it makes learning Chem fun.

[@ChadsPrep]

Excellent - glad to hear it - Happy Studying!

[@CloudslnMyCoffee]

I got behind, you are really helping me catch up. Thanks!

[@ChadsPrep]

Awesome to hear it! Happy studying :)

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How could my professor lose 3 hours talking too much and he couldn't make any one understood like the way you do😭

[@ChadsPrep]

Glad the channel/video helped.

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another great breakdown - your vids rly help with practice and am making me realize I can do this! (just gotta put in the effort 😅). your shirt got me excited lol - a breath of fresh air✝ thanks again!

[@ChadsPrep]

Excellent - you're welcome and Thank You!

[@brayancamargo2048]

Chad you’re a life saver man ♥️ much love and blessings brother👑

[@ChadsPrep]

Thank you!

[@abhinavlenkala]

I was stuck on reaction coordinate diagrams, but you made them very clear. Thank you!

[@ChadsPrep]

Glad it helped!

[@alexsheremett3097]

thank you didn't have the slighterst chance to have this kind of information on chemistry when I was at highschool , just irreplaceable

[@ChadsPrep]

You're welcome and Thank You very much.

[@johnmojeck9023]

this is really helpful thank you Chad

[@ChadsPrep]

Glad to hear it, John - You're welcome!

[@user-ob2qc2tq1n]

I'm a student in Taiwan where the official language is Chinese, but I still learned a lot from your video! Thanks for making this!

[@ChadsPrep]

Glad to hear it - you're welcome!

[@jetstory9574]

Great video, thank you for posting. Question from 33:00-34:00: Is the RDS for a multistep reaction the step with the largest Ea (i.e. largest energy gap from reactant to TS for one step), or the step with the highest Ea (i.e. highest energy TS overall)? In your example the 1st step is both of these, but if the 2nd step had a slightly higher TS energy than the 1st step, would the 2nd step now become the RDS, even though the 1st step still has a larger gap from reactant energy to TS energy for that step?

[@explaindofficial]

at 22:47, could you just not have canceled K1 and K-1 because they are worth the same value in equilibrium? And if the slow step is the second step and there is no reactants, what other work do you have left to do?

[@shereea1823]

Great video!

[@ChadsPrep]

Thanks, Sheree A!

[@katherine5184]

Thanks for the amazing video Chad! I was wondering if you had made a video on steady-state approximation, and if not-I would greatly appreciate it if you made one! Thanks!

[@ChadsPrep]

You're welcome Katherine. And while I don't have a video on the topic on youtube, I do use the steady state approximation as the foundation for deriving the Michaelis-Menten equation here: www.chadsprep.com/chads-elementary-biochemistry-videos/4-2a-derivation-of-the-michaelis-menten-equation/ Hope this helps!

[@katherine5184]

@@ChadsPrep Thank you!

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[@ChadsPrep]

Glad to hear it!

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[@ChadsPrep]

Excellent!

[@audrey-ib8be]

what if there is two really slow steps in a reaction? would both steps affect the overall reaction rate? i am a chem student taking chem in the summer btw and am having trouble grasping everything in such a short course. your teaching course is amazing though and has taught me more concepts instead of pure memorization. thank you!

[@Thikra581]

If you have two slow steps in the reaction, you will choose the slower one. Most times you wouldn't get a two slow step reaction, but if you do, your slower one would be the rate determinant. Both wouldn't necessarily affect the overall reaction rate, just the one that is slower.

[@gertrudempirirwe946]

Am glad to be here

[@ChadsPrep]

Glad you found us!

[@KeeruSta-zu9rq]

Very helpful.

[@ChadsPrep]

Glad to hear it

[@beerizik4890]

hey chad how can i determine if the reaction is elementary or not? i didnt understand the diferrence. thanks

[@ChadsPrep]

an elementary reaction has a single step and a single transition state. If you look at the examples drawn around 32 minutes the left hand diagram is elementary whereas the right has more than one step (and more than one tranition state)

[@sarvesh4315]

U r the real GigaChad

[@ChadsPrep]

Glad you like the channel.

[@user-pk5go3ij7x]

Powerful 💪

[@ChadsPrep]

Thanks!

[@kazezeze]

Thank you for the video! It did clear up some of my confusions, but I am still confused on how to find reaction rate laws. Do you think you could provide a concise explanation on how to do it? Thank you!

[@ChadsPrep]

You may not have realized this, but this video is part of a large playlist for General Chemistry and Rate Laws was the topic of the previous video including how to determine the rate law from experimental data: kzbin.info/www/bejne/fpqufZ9rYqtjhq8 Hope this helps!

[@kazezeze]

@@ChadsPrep oh okay! Thank you. Actually I think I understood rate laws, instead I didn’t really understand the part when you had the 3 rate mechanisms and made equations based off them.

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[@ChadsPrep]

Excellent!

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[@ChadsPrep]

Glad the channel is helping you!

[@losharipoezekiel655]

Can pt be intermediate

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God sent❤️❤️❤️

[@ChadsPrep]

Thank you, Jayme!

[@explaindofficial]

Our olympic race: Run a 100m dash, do a quick acid-base titration, write the rate law for an overall reaction, calculate pH and pOH for a reaction and then finish it off with a cup of cold distilled water 😂

[@ChadsPrep]

🏃💨

[@hermankeller1071]

Inspiring and so full of love!! #1 view provider Promo>SM!

[@ChadsPrep]

Glad you like the video, Herman Keller - Happy Studying!