teaching is an art, and this video instruction is honestly comparable to a Monet water lily; Chad explains it to us like we are students, not scientists. That is a strangely simple, yet commonly misunderstood pedagogy many instructors miss. Awesome stuff, Chad! Thanks :)
when I tell you it all made sense so well, it did. I sat here for 3 hours trying to find a good video and no one explained it as well as you did. thank you so much!
Actually the job of a college professor is to teach the subject they are speaking about. If they do a poor job teaching the subject, they fail at their primary job function.
This has been the BEST class on Molecular Orbital Theory, from covering all the basic visualizations and understandings and then taking up all the corresponding concepts.... Sir, you should start teaching courses on "How to Teach" I can't be anymore grateful, thanks a ton for such informative and structured Lecture....Bless you!!
one of the best lectures I have ever seen. This topic has always been extremely unclear to me for YEARS, and you have finally been able to make sense of it for me. Amazing! Also the production quality and sound are top notch
Hands down the BEST explanation of MO theory on youtube!! Thank you for explaining this. I have a midterm coming up in a few days and I was struggling so much to understand this theory during review, but now I am much more confident. Thank YOU!
Hey, I'm just randomly reviewing for my gen chem class, but I just wanted to say thank you so much for these videos. You're able to explain things so clearly, it's almost like magic. I'm always struggling in class trying to understand what the professor is saying but I'm never worried because I have these videos to fall back on. Truly, thank you!.
Thisi is such a good video, and his name is CHAD. Chad chem video absolutely destroys my prof chem lectures (as in he does way better at explaining everything). underrated neeeds more subs.
It's extraordinary to see how such difficult concepts can be explained in an understandable and engaging way! Congratulations on the excellent work, professor! Keep it up.
I'm a medical student all over in South Korea, was having a hard time cramming for my general chemistry final exam. I was doubting watching this video because all the other videos I watched were either too deep or only too shallow...but well, turns out to be the best choice before my exam. I excelled at the exam :)
Thank you so much! You explained MO theory that took 3 hours for my university professor to explain and yet many still are confused to just merely 45 minutes. Mad respect. Including visualisation aid was also a game changer for MO theory :)
I found your channel while looking for an explanation about MO theory, and I am so happy I know about your videos now! The way you explain things makes it so easy to understand. I started studying this semester for my BA/MS in Biochemistry and I'm so excited I have your videos to help me along the way. Thank you so much for your time and effort making these videos, it is greatly appreciated!
This is the best video I found on molecular orbital theory. I'm studying this a day before my professor teaches it in class, it will be so helpful. Thank's for making this Chad! Respect++
The way our teacher taught us man! 'i was really confused and didn't understand much' but now thanks to you sir everything is like crystal clear and this lesson might give me an edge on my competitive exam.
@@ChadsPrep I have a doubt sir the B.O.(He2)=0 this concludes it forms no bond that's why (He2) doesn't exist but B.O.(Be2) =0 then how does Beryllium forms a dimer and exist.
Great question. Molecular orbital theory doesn't predict stable dimers for beryllium or for the noble gases as discussed in the video. But weakly bonded dimers exist not only for beryllium, but for noble gases also! From the perspective of molecular orbital theory, this was completely unexpected. It has been accounted for with some advanced quantum mechanics and the interactions are more like van der Waals forces than covalent bonds. Hope this helps!
Thanks for your videos about atomic orbitals and molecular orbitals! 👍These topics are generally more abstract and thus difficult than other topics in general chemistry, but you explains much more clearly than my professor. I had just finished my midterm covering these topics, and I score 49/50 (50 MCQs, mean = 31)! 😆You save my grade! 😄Without your teaching, I definitely cannot get such high score!
you are saving me, I wish university would hire ACTUAL teachers to teach these courses, would make things a lot easier. I have my final exam in 2 days and going through everyone one of your gen chem videos has solidified my understanding SO much more. I wish I found these videos earlier, I will absolutely be posting your page in the discord for this course! Here's to hoping I pass and dont need to retake it in spring lol!
at my uni the chemistry teachers have kind of given up, they regurgitate the same unintuitive powerpoints year after year. I also have the exam in two days. Best of luck to you
@@ChadsPrep I failed. Mine was harder than before, they asked things in roundabout ways. I knew too little of the specifics. I also dislike their exams since they can ask for the lewis model for R-CHx for example, but then in the exam answer afterwards, they always go on long tangents that aren't specifically asked for.
I'm an Aerospace engineering student. I find myself having basic chem as a course and I haven't had a chem class in two years. This video has helped me a bunch, I hope it manages to get me to pass chem so i never have to deal with it again!
Sir, I give you mad props for doing all that super duper useful work for us, you've given me hope to face such a charming monster like chemistry once again! Keep it up, wishing you the best from Italy!
I'm a post grad. chem student and I'm making connections with Chad's vids that I haven't been able to with yrs of hoity-toity profs. lecturing 😋 bloody legend!
Very approachable. Amazingly good actually, as I followed it all and I'm not even a chemist. I did physics and maths, dropping chemistry quite early on. Two nitpicks: In the first few minutes the term mathematical 'equation' was used instead of 'function'. At 26:22 it is stated that processes tend to minimise the energy of the universe. It is more a question of maximising the entropy of the universe. Energy is conserved. The decrease in molecular energy has to be reflected by an increase in the energy of the rest of the universe. Entropy, though, is not conserved and increases when energy is distributed throughout the whole universe. These momentary remarks are very much a side issue here and do not detract at all from the value of this video.
Such positive vibes and extremely clear visualization to help students understand the material. One of the best videos I've seen on the internet, fantastic!
Thanks Steven! You might also want to check out a recent video on the same topic: ruclips.net/video/oWzuqLl6Ito/видео.html Dr. Robertson and his team included some great illustrations and animations; really well done!
2024 and you are still blessing students with your knowledge and help. Thank you so so much for your patience and clarity in teaching a difficult subject!!!
Thanks alot man!! You make complicated stuffs easy pizzy!! Also, a special thanks to RUclips algorithm for suggesting me your channel. You are really making life of chemistry students easy.. Thanks real life Heisenberg a.k.a walter white 😌... Love and respect from India 🇮🇳
I just have to subscribe now. Thanks a lot Chad. Your video on R and S configuration helped me a lot and I was very happy to see your video pop up few minutes ago as I was looking for videos to help me understand Molecular Orbitals.
In our QM-lectures we never depicted 'common' oxygen like O=O because that would be suitable for diamagnetic singulett-oxygen. Better ways for paramagnetic triplett-oxygen we used were •O-O• or with the two dots between the Os above the sigma-bond. Maybe even like O÷O Greetings from an M. Sc. in chemistry.
I was really stressed about it i have the finals coming and inglish is my second language, but surprisingly i understood all of them. Thank you so much you helped me alot i was starting to loose hope and I'm glad that i didn't ❤thank you❤
amazing explanation, I am really speechless I watched a lot of videos on this concept but did not understand until I came across your video. (Btw I am class 10)❤❤
Wow! I listened to countless lectures and was failing to understand this complex subject! I understand it perfectly after watching this video! Thankyou so much, Chad!
Sir, can you please make another video about MO diagrams of Heteronuclear Diatomic Molecules like cyanides? And I would really liked to learn more about S-P orbital bonding using MO diagrams.
When looking at O2, we see there is one sigma bond and one pi bond when you draw the lewis structure. I'm confused as to why there is a second set of sigma orbitals (σ2p and σ2p*) since there is only one sigma bond. Shouldn't there only be σ2s, σ2s*, π2p, π2p*, and one bonding, unhybridized p orbital along with one antibonding, unhybridized p orbital?
Just a question, what actually makes the wave function of the orbital, in H for example, be in a different fase comparing to other H atom orbital... Is it just randomly attributed by the moment in which the electron and the nucleus started to interact, or is there a "force" or characteristic that makes it be that way? Sorry for any English mistakes, it's not my language 😂
Are the constructive/destructive overlap of atomic wavefunctions mathematically precise addition and subtraction, or is this addition and subtraction just a qualitative concept that describes the general shape of the result?
It depends on tthe extent to which the two waves are in phase. If two waves overlap perfectly in phase i.e. peak and trough overlap perfectly it will sum up the amplitudes, likewise if thee peak-trough align perfectly they will cancel out
35:13 but isn't O2 in its stable state actually a biradical? •O-O• This also matches with the two unpaired electrons on the left side. So the double bond lewis structure is basically wrong and actually disproven by the MO diagrams?
First of all, this video is super great & explained really well! however, i haven't quite understood why the 2p pi* orbital was filled before the 2p sigma* orbital at 34:00 . doesn't a pi bond require more energy?
If it helps to memorize the orbital diagram I have drawn here, the pi* orbital is below the σ* orbital meaning it is lower in energy. When we consider the bonding orbitals, σ orbitals align head on whereas pi align side by side, meaning σ orbitals overlap more than pi orbitals. For in phase this leads to greater constructive interference for σ bonding orbitals than pi bonding orbitals making σ lower in energy. Howerver, for antibonding orbitals that are out of phase we have the opposite effect - σ* overlap head on causing greater destructive interference than pi* orbitals and therefore the σ* is higher than energy than pi*... hope that helps!
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teaching is an art, and this video instruction is honestly comparable to a Monet water lily; Chad explains it to us like we are students, not scientists. That is a strangely simple, yet commonly misunderstood pedagogy many instructors miss. Awesome stuff, Chad! Thanks :)
You are gracious in your comparison. You're welcome and thank you.
when I tell you it all made sense so well, it did. I sat here for 3 hours trying to find a good video and no one explained it as well as you did. thank you so much!
You're welcome - Glad the channel is helping you!
Honestly, you should teach college professors how to teach chemistry, o chem or any science course in plain English terms.
Kind words - thank you very much.
They’re lecturers.
They don’t teach. They lecture.
@@anthonybwalya139then they’re not necessary tbh
@@Ahyawnah they teach adults not kids.
An adult can be lectured coz they can comprehend on their own.
Actually the job of a college professor is to teach the subject they are speaking about. If they do a poor job teaching the subject, they fail at their primary job function.
This has been the BEST class on Molecular Orbital Theory, from covering all the basic visualizations and understandings and then taking up all the corresponding concepts....
Sir, you should start teaching courses on "How to Teach"
I can't be anymore grateful, thanks a ton for such informative and structured Lecture....Bless you!!
Thank you for your kind words - glad the channel is helping you!
I watched all your videos since 2017 and last year I was able to start working as a TA for the chem department!!! All thanks to you Chad
Excellent, SK - much success to you!
Not all heros wear capes and this man right here is an absolute example
Thanks - kind words.
one of the best lectures I have ever seen. This topic has always been extremely unclear to me for YEARS, and you have finally been able to make sense of it for me. Amazing! Also the production quality and sound are top notch
Glad the video/channel is helping you - Happy Studying!
Hands down the BEST explanation of MO theory on youtube!! Thank you for explaining this. I have a midterm coming up in a few days and I was struggling so much to understand this theory during review, but now I am much more confident. Thank YOU!
You're welcome - Glad to hear it. Hope you do well on your midterm.
Hey, I'm just randomly reviewing for my gen chem class, but I just wanted to say thank you so much for these videos. You're able to explain things so clearly, it's almost like magic. I'm always struggling in class trying to understand what the professor is saying but I'm never worried because I have these videos to fall back on. Truly, thank you!.
You're welcome and Thank You!
Incredibly helpful. Really good and intuitive explanations, not just technicalities. A huge thank you, Chad!
You're welcome and a huge Thank You back!
Thisi is such a good video, and his name is CHAD. Chad chem video absolutely destroys my prof chem lectures (as in he does way better at explaining everything). underrated neeeds more subs.
Kind words - thank you. Glad for YOUR sub and Happy Studying!
It's extraordinary to see how such difficult concepts can be explained in an understandable and engaging way! Congratulations on the excellent work, professor! Keep it up.
Thanks for saying so!
I'm a medical student all over in South Korea, was having a hard time cramming for my general chemistry final exam. I was doubting watching this video because all the other videos I watched were either too deep or only too shallow...but well, turns out to be the best choice before my exam. I excelled at the exam :)
Kudos on your exam performance - glad you found us!
SAVED MY LIFE. ive been struggling with MO theory and MO diagrams and these videos were REALLY helpful. i understood everything omg A HUGE THANK YOU
You're welcome!
Thank you so much! You explained MO theory that took 3 hours for my university professor to explain and yet many still are confused to just merely 45 minutes. Mad respect. Including visualisation aid was also a game changer for MO theory :)
Glad the channel/video was able to help you!
i've been watching you since the start of this semester and you have helped me sooo much, thank you!!
Glad the channel is helping you - Happy Studying!
Absolutely amazing explanation. A gem of a teacher!!! Was stressing over this topic for 2 weeks 😭
Thanks!
Start here: 1:10
I found your channel while looking for an explanation about MO theory, and I am so happy I know about your videos now! The way you explain things makes it so easy to understand. I started studying this semester for my BA/MS in Biochemistry and I'm so excited I have your videos to help me along the way. Thank you so much for your time and effort making these videos, it is greatly appreciated!
Glad you found us - Happy Studying!
I'm taking inorganic chemistry this semester and I definitely needed this refresher. Tysm, Chad, your videos are always clear and helpful!
You're welcome - Glad the channel is helping you!
This is the best video I found on molecular orbital theory. I'm studying this a day before my professor teaches it in class, it will be so helpful. Thank's for making this Chad! Respect++
You're welcome - Happy Studying!
The way our teacher taught us man! 'i was really confused and didn't understand much' but now thanks to you sir everything is like crystal clear and this lesson might give me an edge on my competitive exam.
Glad to hear it - hope you do well on your exam.
@@ChadsPrep I have a doubt sir the B.O.(He2)=0 this concludes it forms no bond that's why (He2) doesn't exist but B.O.(Be2) =0 then how does Beryllium forms a dimer and exist.
Great question. Molecular orbital theory doesn't predict stable dimers for beryllium or for the noble gases as discussed in the video. But weakly bonded dimers exist not only for beryllium, but for noble gases also! From the perspective of molecular orbital theory, this was completely unexpected. It has been accounted for with some advanced quantum mechanics and the interactions are more like van der Waals forces than covalent bonds. Hope this helps!
Thanks for your videos about atomic orbitals and molecular orbitals! 👍These topics are generally more abstract and thus difficult than other topics in general chemistry, but you explains much more clearly than my professor. I had just finished my midterm covering these topics, and I score 49/50 (50 MCQs, mean = 31)! 😆You save my grade! 😄Without your teaching, I definitely cannot get such high score!
Glad the channel is helping you out!
I was so lost! But now I actually understand MO theory! Thank you! 🙏 Those 45 minutes flew by too
You're welcome - Glad to hear it!
I’ve been struggling with this for 2 days and he just makes it so much easier. Thank you
You're welcome.
you are saving me, I wish university would hire ACTUAL teachers to teach these courses, would make things a lot easier. I have my final exam in 2 days and going through everyone one of your gen chem videos has solidified my understanding SO much more. I wish I found these videos earlier, I will absolutely be posting your page in the discord for this course! Here's to hoping I pass and dont need to retake it in spring lol!
All the best on your final - Thanks and Happy Studying!
at my uni the chemistry teachers have kind of given up, they regurgitate the same unintuitive powerpoints year after year. I also have the exam in two days. Best of luck to you
How did the exam go?
@@ChadsPrep I failed. Mine was harder than before, they asked things in roundabout ways. I knew too little of the specifics.
I also dislike their exams since they can ask for the lewis model for R-CHx for example, but then in the exam answer afterwards, they always go on long tangents that aren't specifically asked for.
I'm an Aerospace engineering student. I find myself having basic chem as a course and I haven't had a chem class in two years. This video has helped me a bunch, I hope it manages to get me to pass chem so i never have to deal with it again!
Glad you found the channel - Happy Studying!
Sir, I give you mad props for doing all that super duper useful work for us, you've given me hope to face such a charming monster like chemistry once again!
Keep it up, wishing you the best from Italy!
Glad the channel is helping you - You're welcome from USA!
Thank you Professor for this great presentation. I understand MO much better.
You're welcome - Glad to hear it!
This is beautiful, thanks , your gen chem playlist is really "carrying" my studies :) .
Glad you found us - Happy Studying!
Thank you for sharing these lectures, the examples/practice questions are incredibly helpful!
You're welcome - glad to hear it!
Thankyou Chad!!!!. My book was
so complicated, you made it very easy for me
You're welcome - Glad to hear it!
I've never seen any teacher like I love you chad❤
Glad the channel is helping!
I'm a post grad. chem student and I'm making connections with Chad's vids that I haven't been able to with yrs of hoity-toity profs. lecturing 😋 bloody legend!
Glad to hear it, Josh - Happy Studying!
God bless you for your support to their peoples 👏👏👏 i appreciate
Very welcome
Came here from three twentysix, and, really got benefited by your video. Thank you too 🙏
Glad it is helpful!
Thanks, this is a great refresher for me, as I haven't studied MO theory in over 28 years (I don't work in the Chemistry field).
Glad it helped - Happy Studying!
I've been watching your videos since I was in college. And right now, I am also a chemistry lecturer. Thanks chad! Hope to connect with you!
Awesome to hear this :)
Very approachable. Amazingly good actually, as I followed it all and I'm not even a chemist. I did physics and maths, dropping chemistry quite early on.
Two nitpicks:
In the first few minutes the term mathematical 'equation' was used instead of 'function'.
At 26:22 it is stated that processes tend to minimise the energy of the universe. It is more a question of maximising the entropy of the universe. Energy is conserved. The decrease in molecular energy has to be reflected by an increase in the energy of the rest of the universe. Entropy, though, is not conserved and increases when energy is distributed throughout the whole universe.
These momentary remarks are very much a side issue here and do not detract at all from the value of this video.
Simply amazing, thanks for getting me up to speed on my AP chem class!
You are most welcome.
thank you so much i learned how to do these diagrams incredibly fast I am truly thankful for this video!!!
Glad it helped!
You are the god of chem
Glad the channel is helping you.
It's amazing that molecules bond and stay together with all of this wonderful complexity.
Amazing, indeed!
This is the best video of molecular orbitals on the internet.
Thank you.
Such positive vibes and extremely clear visualization to help students understand the material. One of the best videos I've seen on the internet, fantastic!
Thanks Steven! You might also want to check out a recent video on the same topic: ruclips.net/video/oWzuqLl6Ito/видео.html
Dr. Robertson and his team included some great illustrations and animations; really well done!
Three Twentysix recommended me Your lectures and I'm very thankful. You are an excellent teacher. You truly are the Chaddiest of Chemistry Chads ❤
Thanks so much! Welcome to the channel :)
I'm from Egypt and i loved your explanation ❤❤
Thank you from USA!
This is the most informative video on molecular orbital theory.
Thank you
Thank you for saving my grade and for making this concept genuinely interesting and possible to learn
You're welcome - glad it helped you out!
I would like to express my greatest admiration!!! Precise and clear explanation thanks alot.
You're welcome and Thank you very much.
2024 and you are still blessing students with your knowledge and help. Thank you so so much for your patience and clarity in teaching a difficult subject!!!
You're welcome and Thank You!
Best teacher to teach chemistry out there
Thank you
Holy cow thank you so much for simplifying this! I feel so much better about my final tomorrow !!!
Glad the video helped - Hope you do well on your final!
Thank you to your sound engineer!
🙂
Hey!! Great explanation, very helpful! Also, did you make a video on Heteronuclear compounds' MO diagram?
Thank you so much! This video was so helpful to clear my doubts of MOT.
You're welcome - Glad to hear it!
please!I LOVE YOU!You just saved my life
Glad the videos are helping you!
MARVELOUS explanation, 2 hours before midterm
Thank you
Thanks alot man!! You make complicated stuffs easy pizzy!! Also, a special thanks to RUclips algorithm for suggesting me your channel. You are really making life of chemistry students easy.. Thanks real life Heisenberg a.k.a walter white 😌... Love and respect from India 🇮🇳
You are welcome and Thank you - Happy Studying from USA!
Thank you so much. I learnt a lot from this RUclips video.
You're welcome - Glad to hear it!
Thank you so much for this lecture and video! It has been instrumental to grasping MOT!
You are most welcome.
Thanks a lot!! Is there a video for heteronuclear molecules, such as CO or NO, because I get confused in that part...
This was soo helpful
Thanks a lot👍👍
Very welcome!
I love ur lectures so much thank you for saving my grade
Thank you - Glad the channel is helping!
I just have to subscribe now. Thanks a lot Chad. Your video on R and S configuration helped me a lot and I was very happy to see your video pop up few minutes ago as I was looking for videos to help me understand Molecular Orbitals.
Awesome to hear it and welcome to the channel :)
one of the best channels for learning chemistry.
Thank you!
Thank you so much. I finally understand MOT now!
That's great!
In our QM-lectures we never depicted 'common' oxygen like O=O because that would be suitable for diamagnetic singulett-oxygen.
Better ways for paramagnetic triplett-oxygen we used were •O-O• or with the two dots between the Os above the sigma-bond. Maybe even like O÷O
Greetings from an M. Sc. in chemistry.
I really appreciate you for making this. Very helpful to all university students.
You're welcome and Thank You.
you are amazing, I was stuck in this subject, and now I understand better, thank you!!
That's great to hear - You're welcome and Thank You.
I was really stressed about it i have the finals coming and inglish is my second language, but surprisingly i understood all of them. Thank you so much you helped me alot i was starting to loose hope and I'm glad that i didn't ❤thank you❤
Great to hear this :) Good luck on your finals!
A HUGE THANK YOU! I am currently studying for my test tomorrow and your video is really the best!
A huge you're welcome - hope you do well on your test!
Best video about MOT. Thank you soooo much this video helped me a lot🙏
Awesome! You are welcome :)
i haven't seen any clearer than this thank u
You're welcome - thank you.
extremely helpful, I appreciate this channel a lot💜. It would be amazing if you'd make follow ups to go more in depth with the lectures
Thank you.
You just saved my chem grade, thank you very much
You're welcome - Glad you found us.
Thank you so much, I can’t believe I have accidentally come across such a good channel!
Glad you did - Happy Studying!
I wish I could like this video more than once. It helped a lot, Thank you so much.
Appreciate your kind words, Linda!
amazing explanation, I am really speechless I watched a lot of videos on this concept but did not understand until I came across your video.
(Btw I am class 10)❤❤
Thanks and Welcome to the channel - Happy Studying!
God bless you Chad!! This is an amazing video
Thank you and to you as well.
Very helpful😊❤
Glad to hear it!
Wow! I listened to countless lectures and was failing to understand this complex subject! I understand it perfectly after watching this video! Thankyou so much, Chad!
That's great to hear :)
Best explanation ever 😍😍😍
Thank you!
This has been really helpful, thank you so much🙏
You're welcome - Glad to hear it!
Nah God bless this man... having test next week and i come across this ❤❤❤
Glad you found us - hope you do well on your exam!
Hi from Italy. Very wonderful lesson.
Hello and Thank you from USA.
Thanks sir 🙏 love from India 🇮🇳
You're welcome from USA!
Sir, can you please make another video about MO diagrams of Heteronuclear Diatomic Molecules like cyanides? And I would really liked to learn more about S-P orbital bonding using MO diagrams.
agreed!
check out the MIT lectures, theyve got a few hour lectures where they talk about this
This was just what i needed THANKS
Glad the channel helped you out!
It was really helpful. Thanks a million 🙏
You're very welcome.
When looking at O2, we see there is one sigma bond and one pi bond when you draw the lewis structure. I'm confused as to why there is a second set of sigma orbitals (σ2p and σ2p*) since there is only one sigma bond. Shouldn't there only be σ2s, σ2s*, π2p, π2p*, and one bonding, unhybridized p orbital along with one antibonding, unhybridized p orbital?
Just a question, what actually makes the wave function of the orbital, in H for example, be in a different fase comparing to other H atom orbital... Is it just randomly attributed by the moment in which the electron and the nucleus started to interact, or is there a "force" or characteristic that makes it be that way?
Sorry for any English mistakes, it's not my language 😂
Thank you. Very clear explanation and helpful video
Great to hear, Matilde!
Are the constructive/destructive overlap of atomic wavefunctions mathematically precise addition and subtraction, or is this addition and subtraction just a qualitative concept that describes the general shape of the result?
It depends on tthe extent to which the two waves are in phase. If two waves overlap perfectly in phase i.e. peak and trough overlap perfectly it will sum up the amplitudes, likewise if thee peak-trough align perfectly they will cancel out
Chad > My Lecturer
Your Comment = Thanks
Does the structure change for every type of bonding and is it always the same?
How they define orbital energy levels? By computational calculations? like DFT?
35:13 but isn't O2 in its stable state actually a biradical? •O-O•
This also matches with the two unpaired electrons on the left side.
So the double bond lewis structure is basically wrong and actually disproven by the MO diagrams?
First of all, this video is super great & explained really well! however, i haven't quite understood why the 2p pi* orbital was filled before the 2p sigma* orbital at 34:00 . doesn't a pi bond require more energy?
If it helps to memorize the orbital diagram I have drawn here, the pi* orbital is below the σ* orbital meaning it is lower in energy. When we consider the bonding orbitals, σ orbitals align head on whereas pi align side by side, meaning σ orbitals overlap more than pi orbitals. For in phase this leads to greater constructive interference for σ bonding orbitals than pi bonding orbitals making σ lower in energy. Howerver, for antibonding orbitals that are out of phase we have the opposite effect - σ* overlap head on causing greater destructive interference than pi* orbitals and therefore the σ* is higher than energy than pi*... hope that helps!
beautiful explanation. Thank you!
You're welcome and Thank You!