Energy Diagrams, Catalysts, and Reaction Mechanisms

It's time to learn a little more about a chemical reaction. How do molecules have to be arranged and how much energy do they have to collide with? What's a catalyst? Lots of great tidbits in this one.
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[@ihaveacatandhisnameisapollo]

I study chemistry in arabic and thank god that there is arabic subtitles or else i would translate EVERYTHING to arabic.

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chemistry in arabic would be living torture oh my lord. genuinely wishing you good luck

[@israelibyheart]

How about a little explanation of the equation next time where you actually work out an example. The concepts are easy to comprehend, it's the math that throws most of us off.

[@science-health-safetymusic2322]

If u understand the concepts u can also understand the math more easily and it's a bit easy to solve problems!....most of my classmates before failed in the chemical engineer's licensure examination because they focused more on problem solving rather than on basic theories and concepts, but in my part I memorized majority of the science concepts / theories that made me passed in that examination regulated by Philippine Regulation Conmission (PRC) in our country...I am not good in mathematics but I managed to become a Registered Chemical Engineer I also study problem solving but in the actual examination not all problems will come out a lot of concepts / theories....I don't know with other countries set up but this is based on my country (Philippines) .....it must be balanced theories and mathematical ability (problem solving)....

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Simple,flow,and generous!!!! Thank you 🙏

[@michaelpisciarino5348]

0:45 Activation Energy Transistion State Delta H Exothermic And Endothermic Catylyst, lowers the activation energy, resulting in faster reactions

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[@Nemoguzapomnit]

I've got the sruff about activating energy and catalyst but defenetly got nothing about equation. How that busines work...

[@alissaroush3456]

I followed every part of this comprehension equation up until the answer. I've been trying to catch my mistake for hours. Professor Dave, can you please give me a hint? Maybe you can simplify the left side of the equation? On the right side, I end up with Ea/-83.15 J/mol, therefore multiplying both sides by the -83.15 J/mol.

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[@maricelalopez441]

Professor Dave what are the common questions asked when using the Arrhenius equation and what are their equations. I have only taken basic algebra. I do not know how to manipulate the equation. Never taken calculus or physics. Can you help please.

[@ProfessorDaveExplains]

you don't need any calculus! it's just algebra. i am releasing an ultra-comprehensive mathematics series as we speak, if you watch some of those you will gain all the math skills you will ever need for science! i'm in the middle of algebra right now, so at least get through those. natural logs are just logarithms with base e, and i will get to those pretty soon too.

[@husseinfedilla6814]

thank you very much prof please I want video about specificity of catalyst

[@brandon13752]

You are the reason my AP chem grade is okay

[@S4Kyoto]

Hi, watching this video reminds me of a discussion i had with my teacher. In every book i readed so far i learned that a catalyst gives a other reaction way. My teacher said thats wrong and there are many examples proof that. But actually i dont wanted to piss her of more cause i dont want to loose my A in this class. So i didnt ask for any examples. Can u give me some or is my opinion on catalyst right and my teacher has no idea ? ;)

[@ProfessorDaveExplains]

+Wiz Onio sometimes a catalyst offers an alternate reaction pathway, but not always. for example, an enzyme, which is just a protein that performs some cellular catalytic function, can promote a reaction in some complicated way, or sometimes it just bends a substrate until it's in an energetically unfavorable conformation such that the reaction becomes more favorable. the best definition of a catalyst that applies to every example is that it is something that lowers the activation energy of a reaction.

[@maricelalopez441]

Do you only use the equation above for all Arrhenius equation problems?

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Amazing stuff.

[@jpmhess]

You are the best

[@christopher-zq4ko]

Thank you professor Dave!

[@chelseavelasquez2369]

thank you for making these videos! how do you find the Ea in the comprehension problem. I tried to divide the value for the temparatures on each side and then multiply by 8.315 to get Ea alone but couldnt figure out how to get your answer.

[@chelseavelasquez2369]

my answer came out to 0.001037 which would become 10^3 instead of the correct answer which is 1.o3x10^5. I am confused as to where I went wrong on getting Ea alone

[@caesarwiratama3303]

Thanks, great explanation!

[@zizetghobrial2155]

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[@miriamramos8873]

Thank you professor Dave

[@eng.maimonahkhader3311]

Thank u for these great videos. I think catalyst does not lower the activation energy but it provides another mechanism or pathway for the reaction to take place, and this pathway needs lower activation energy.

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Professor Dave

[@snigdha7427]

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[@mowbray6107]

my answer for the activation energy is 103670,88 j/mol is this in the margin of error, or did I do something wrong? thanks for the help in advance

[@YsoGame]

103416.91j per mole is my ans

[@zarasayed9138]

A catalyst is added to the reaction to speed up the reaction. Then why is it not found in the product? If it's not used where does it go?

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Great channel

[@musiclyrics3543]

Hi. Can I ask where did 308k and 318k from? I'm not good in chemistry

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your video's thaught me my chemistry classes in one night, all clear, while my prof needs 13 weeks with 2h/week and I still don't get what she means

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Bro, no way my gen chem teacher spent 2 hours going over this, alongside 3 hours of reading, no way you just explained it in 5 minutes

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Thanks

[@elviskingiri3520]

What catalyst can be used for sodium carbonate and phosphoric acid as reactants

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How to identify activated complex?

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[@calm_Ron]

best intro in the world.

[@mrpickles1]

I keep getting 2.9 x10^5 for the comprehension check and can't figure out where i'm going wrong.

[@mrpickles1]

oops. never used the 'ln' button on my calculator before! Yay learning!

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[@cynthiaoliver4469]

Thank you sir, is activation energy the same as bond breaking energy?

[@ProfessorDaveExplains]

no, bond dissociation energy is different

[@cynthiaoliver4469]

Sorry sir, please when do we have the bond forming energy?? Is it after breaking bonds between the reactants that the activation energy can be gotten??

[@ProfessorDaveExplains]

the activation energy is the energy required to reach the transition state

[@عبّدِالُمٌجْيَدِالُدِحُمٌ-ب5ج]

very Good

[@trixinreno419]

The little things like forgetting to convert temp got me😢

[@Gohanson888]

Could we consider water as a catalyst in reaction between sodium and chlorine?

[@ProfessorDaveExplains]

nope! it's a solvent.

[@-tweeomoz-1786]

3:06 Ah yes, my favorite number: e. (Jokes aside, terrific video)!

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[@rossfriedman6570]

Is is a neurotransmitter binding to a receptor an example of a chemical reaction?

[@ProfessorDaveExplains]

nope

[@rossfriedman6570]

Why tho

[@ProfessorDaveExplains]

It's just electrostatic interactions, chemical reactions require the breaking and forming of covalent bonds. Check my biochemistry tutorials.

[@YsoGame]

103416.91j per mole is my ans isn't correct??

[@muramasa2643]

Intramolecular nucleophilic aromatic substitution mechanisms please Prof :D

[@priyanshusahu001]

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[@jiinjung1445]

how can I find the value of LN5.0/1.4 in the last question??

[@aviral1337]

You must remember ln10 = 2.3 Then ln5 = ln(10/2) =ln10 - ln2 =2.3-0.7 =1.6

[@mariofelipequevedolozano3659]

Experimentaly how can i find k1 and k2 if I don't have the activation energy?. I mean, experimentaly i can only know temperature (and we know the universal gas constant from the start) then how could i find K,A and Ea? I thought for a moment i could measure the reaction heat or something, but that'd give me DeltaH instead of Ea :'v

[@mariofelipequevedolozano3659]

Oh well, K could be found by the initial rate method or any other method, then I could find Ea with Ln(k1/k2)= (...)?

[@mrjack510]

why the temperature there are 308K and 318K, should it not be 35 and 45e?

[@ProfessorDaveExplains]

in chemistry we use kelvin, we need an absolute temperature scale to do math

[@mrjack510]

Professor Dave Explains ，thank you professor Dave.

[@DodongoManoof]

I need to know how to put in the curved arrows and name each type of mechanistic pattern throughout a mechanism, I hope I can understand by Friday and it doesn't just look like gobbledygook 😅

[@ProfessorDaveExplains]

That's covered in my organic chemistry playlist.

[@DodongoManoof]

@@ProfessorDaveExplains thanks!

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i love you!!

[@jessicarivers3464]

So, in short words: What's activation energy? pls make it simple to understand it.

[@nandinikn769]

Sir namasthe... why do we add ice cold water during the kinetic study of saponification of MeCOOEt? to slow down the reaction rate or to stop?

[@andreasp3452]

Good video. However I ve searched so much and can't find an answer about how the activation energy is reduced. I mean.. what happens in a molecular level that enables particles with less energy to collide successfully ? Is there something going on with the electrons?

[@ProfessorDaveExplains]

It’s an alternate pathway, different reactions. Or something like an enzyme activating the substrate.

[@brd8764]

what they mean. sir.

[@geniuschemist4612]

How catalyst lowers activation energy ?can anyone answer?

[@ProfessorDaveExplains]

Every catalyst has a different mechanism.

[@geniuschemist4612]

@@ProfessorDaveExplains sir plz explain any one mechanism e.g Fe in haber process how it is helping

[@ProfessorDaveExplains]

I don't really remember, I think it's just standard heterogeneous catalysis on a metallic surface. Oxidative addition and reductive elimination.

[@jayleenrattan8592]

isn't the equation supposed to be (1/T2 - 1/T1) i searched online and apparent;y his equation is wrong

[@ProfessorDaveExplains]

the video is correct

[@jayleenrattan8592]

Ig there are different variations of the equation

[@biancadianaconcepcion9947]

okay I feel a bit dumb but where do 308k and 318k come from?

[@georgeacenas2349]

Convert Celsius to Kelvin

[@donuts2786]

Excuse me sir can you tell how a reaction is elementary reaction or non elementary ?

[@josettetatiana294]

Veryy smart

[@geniuschemist4612]

Everyone is telling catalyst lowers activation energy but nobody is explaining how catalyst lowers activation energy ???,

[@ProfessorDaveExplains]

Learn organic chemistry and you'll see many examples.

[@geniuschemist4612]

@@ProfessorDaveExplains sir can u plz make a video on this ,catalyst mechanism for lowering activation energy ,n thanks for your reply

[@ProfessorDaveExplains]

I have many in my organic chemistry playlist.

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[@ali-rs9wi]

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[@daniicezar]

Hello Are you reading a script or text while teaching this? It kinda looks like

[@ProfessorDaveExplains]

yes, i read my scripts off of a teleprompter to ensure that the material is delivered precisely as i would like it to be.

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