S2.2.11 The delocalization of π electrons and resulting structures (Resonance) [SL IB Chemistry]
HTML-код
- Опубликовано: 8 фев 2025
- Sometimes if single and double bonds are next to each other the pi electrons will undergo resonance -- that is the single and double bonds will switch places. This produces the resonance structures/hybrids -- which are more stable and therefore favoured.
The pi electrons are delocalized (not in one fixed place like a single bond). Any bond that undergo resonance will end up being the same strength and length (in IB)
Dr Atkinson was bifurcated and blinded by the resonance of his star destroyer and is now in Hoth hospital - visits by appointment only.
![S2.2.15 Explain hybridization as mixing of orbitals making new orbitals [HL IB Chemistry]](http://i.ytimg.com/vi/HKyobMewXBw/mqdefault.jpg)
![S2.2.15 Explain hybridization as mixing of orbitals making new orbitals [HL IB Chemistry]](/img/tr.png)
![VSEPR & Molecular Polarity [IB Chemistry SL/HL]](http://i.ytimg.com/vi/GlU9epvu268/mqdefault.jpg)
Oh my gosh mixing Starwars and organic chemistry. It cannot get better than this!
after watching your videos for so long i started to think of you as a friend. whenever i hear your voice and see dr atkinson i feel very reassured :) (i might like him better than my school's ib coordinator!) why do i even bother to attend classes when i can learn eveything i need in such a short length of time? thank you so much!
Normally they would ask for the all the resonance structures, then draw them all out.
They may or may not ask for curly arrows.
The delocalised structure may be shown with a dashed line for the double/single bonds that are resonating.
This video was uploaded on my birthday. I take this as a good sign for my topic 4 test tomorrow.
@Robfire10 Gmod kept crashing and I had to redownload the map to make it work - working that out took a while. To move the spaceships I just used a fixed camera and the physgun without the beam showing then edit the movie - that bit took only 10 minutes
Thank you for this wonderful video
Rich, ur awesome!
Thanks a lot for these videos.
I LOVE the your method of using video games to teach!!!!
You're perfect, thank you so much
cheers
Haha great use of the booster rings at 0:23 :-)
But what are the yellow sticks? light-sabers? or are they not from star wars?
how do you measure the possible bond lengths and strength for the bonds of resonance hybrids, single bond is the weakest and longest, triple bond is the strongest and shortest, and double bond lies in the middle. what kind of bond does pi electrons form?
Also, can you use the dotted lines to show any molecules' intermediate form?
Infra red spectroscopy measures bond oscillations which are related to length and strength. Pi electrons form the 2nd and 3rd bond in double and single bonds. BUT 2 px pi electrons overlap head on and can form a single (sigma) bond.
@@ibchemvids don't get the infra red spectroscopy part but the rest cleared up my understanding about pi electrons for a bit:)
if the question asks to draw an ion with delocalized electrons for example NO3- then how woudl you draw it? woudl you draw curly arrows or what?
Amazing vid
Hi, can we say CH3COOH also has delocalized electrons as we can draw resonance of it?
Only when the H* dissociates, leaving CH3CO2-, the double bond resonates between the 2 oxygens.
you said that oxygen has 8 valance electrons (for ozone).. doesn't it have 6?
Richard Thornley is my hero
8 when it is bonded
cheers mate
are only oxygen atoms capable of undergoing resonance?
other atomic bonds can resonate, eg C to C in benzene. Resonance may occur is double and single bonds are next to each other.
Died forty two times... poor poor Dr Atkinson...
is this needed in SL?
NOT SL for 2015 exams, but it is SL for 2016 and beyond.
A resonance structure is not the same as a resonance hybrid, as a resonance hybrid is synonymous with a delocalized structure?
www.chem.ucla.edu/harding/tutorials/resonance/draw_res_str.html
www.sparknotes.com/chemistry/organic1/covalentbonding/section2.rhtml