To be hetrocyclic the conditions are:

- A close ring

- An atom other than Carbon Or Hydrogen in the PC

Right?

GCSE student going into A level this year. I was doing summer work and found some cool things to research like liquid ions and crystalline solids vs amorphous solids. I was wondering if anyone had any suggestions for topics I could research for fun?

A lot of the other ones I’ve found online so far either have a lot of terms I don’t understand yet, or lean more into biology than chemistry. It’ll be great to hear a few ideas!

Thanks!

i'd say i have an average understanding of what it is...like i know it's a hybrid of orbitals like sp3, sp2, etc. but can someone explain it in full detail? my chemistry teacher teaches very fast-paced and i feel like im missing something.

i guess i just dont really understand how the electrons are filled in the hybrid orbitals and also how an sp2 orbital works.

could someone please help? thank you!!

Can anyone give me an ELI5 (not literally, but I don't understand quantum 😐) on why absorbance spectra are not the same as excitation spectra in e.g. fluorescence spectroscopy? I mean, the excitation (which I assume means promotion of an electron) follows absorption of a photon, right? So you would kind of expect them to be the same. I get that they measure different things, but still if absorption as a function of wavelength has a particular shape then surely you would see the same shape for emission as a function of absorption?

I have done bits and bits from some parts of the book, so I need the whole thing.

I was solving this question and I loved it
(You can try if you want to)

The answer is (2)

The solution is by equation the radial wave function equation to zero, then finding the values of x as 1, 2, 6 and then substituting it in x=2r/a

On solving it we get to know there are 3 possible values of "x" that are 1, 2, 6
which means n-l-1=3
we also know that since at x=0, the value of the equation is not Zero and therefore there is electron probability at the centre, Therefore it's a "s" orbital

so it is obv 4s as it has 3 radial nodes

The minimum distance of the Radial node is a/2 which simply shouldn't be possible right??

Because how can a Radial node or probability of electron be Zero before the "first Bohr orbit" that is 1s

The solution a/2 means there is a radial node before the 1s orbit, But how can a node or 4s exist before 1s? It will face shielding and we all know 4s is an outer orbital and it also has higher energy

I would love if someone could solve this doubt of Quantum Physics

Omg guys I’m major in chem engineering and this semester I’m taking organic chemistry and I don’t get anything. I mean my foundation on chem is actually kinda weak bc I got C+ and D in chem 1 and 2, respectively. And I don’t want to get such grades in organic chemistry I actually want to improve but since the two lectures I took I don’t understand ANYTHING. it feels like a complete gibberish, I paid attention and took notes but it’s just not adding up, it doesn’t make sense to me whatsoever. Soooo any recommendations? Good YouTube videos or methods that could help?
+
I also get told things like “how is u majoring in chem engineering and you don’t know those basic stuff” not just organic chem things basically anything related to my field and I feel sooooo insecure bc of this but I’m trying to learn of course I ain’t gone know everything ☹️😢

1. anyone for chem design practical for titration in the deconstruct sectoin do i wanna highlight every justification as subtopics or jst write it as jst paragraphs
2. plus anyone know how to write perfect evaluation for the report what to mention and write about for good grade

I am having trouble figuring out the chirality of this molecule. From my working, I am getting a: R; b: R; c: R; d: E, but that is not an option in the list of possible answers:

1. a: R; b: R; c: R; d: Z
2. a: S; b: R; c: R; d: Z
3. a: S; b: S; c: R; d: Z
4. a: S; b: R; c: R; d: E
5. a: R; b: S; c: S; d: E
6. a: S; b: S; c: S; d: E
7. a: S; b: S; c: R; d: E
8. a: R; b: S; c: S; d: Z

Am I wrong or is there a mistake in the quiz?

Hello everyone, I am taking organometallic chemistry and we are currently going over phosphine's properties as a ligand. I understand that a filled d-orbital in the metal will π-backbond to the PR₃ LUMO, I also understand how the orbitals above combine to form the LUMO. What I'm having a bit of a struggle with is how the P-R σ* orbital on the left is forming. What I think is happening is the drawing underneath.

I would like clarification if the orbitals can add in this fashion. Basically treating them as vectors whose components can sum or cancel each other. In the above diagram the two orbitals with the same phase cancel their components that point in opposite direction and sum in the same direction. Inverse for orbitals with opposite phase.

If there is a correct way to visualize how the three P-R σ* orbitals sum to form the overall MO please let me know!

Thank you in advance for any clarification you can provide.

p.s.

Sorry if my drawings are unclear. I wasn't trying to do Newman projections just trying to show the perspective looking down along the C₃ axis.

Hi all,

I'm an organic chemistry instructor/YouTuber and I've been building a project called OChemNinja, a pen-first organic chemistry practice website where students draw structures like the exam and receive instant feedback (see gif for example).

One feature I'm actively improving is pen-drawn handwriting recognition. The Honeycomb Vision works by comparing what students draw against the intended organic structure. More "real student" handwriting samples would help improve recognition across different writing styles and devices.

I'm looking for volunteers willing to:

1. Use a pen/tablet device (the site works with mouse/trackpad, but that doesn't need handwriting recognition).
2. Create a free account.
3. Complete the tutorial with the handwriting capture exercises.

As a thank you, I'll grant a free Semester Pass to the practice website for the first 50 users who complete the process using a pen/tablet (if that's ok with the mods. Otherwise, I can rely on the goodwill of fellow redditors).

The tutorial should only take a few minutes and the captured drawings are used to improve recognition performance for future students.

Site: https://ochemninja.com, follow the link to sign up, then open the tutorial.

If you complete it, send me a message (or email support at ochemninja dot com with the account email you used) and I'll activate the pass.

I'm also happy to answer questions about the project or the recognition system.

Thanks!

If someone can help me with the answers I chose for questions 1-4) for the vector map of pET-24a(+)

1) Kan(3936-4748)

2) ori (3227)

3)

All the restriction enzymes here

4)

Maybe Xba I(276) >

Please help it'll mean a lot 👉🏼👈🏼

Sono M38 con un diploma alberghiero e con gli anni ho sviluppato l interesse nel agricoltura ma vedo che ci sono delle nozioni basilari che nn possiedo, spesso le mie curiosità non sono soddisfatte da questo meraviglioso mondo che é internet. Mi mancano proprio le basi della chimica per poter utilizzare al meglio i fertilizzanti per capire come interagisco con le piante e con il suolo.

Avreste dei testi da consigliarmi?

Heya! For context, i am joining an division chemistry olympiad (the one that leads to the IcHo) , i am struggling to find videos related to these (mostly on right, but also the electronic structure of atoms and especially about the acid-base equilibria and salt equilibria, electrochemistry, & equilibrium), the contest is like in 4th of September and kind of find it hard to study these since these are advanced topics. I am familiar with the ones on the left but struggle on the right topics (starting at thermochemistry) and advanced topics as stated below. Can anyone give me channels/worksheets/recommendations or tips based on these topics? (Tried asking the other subreddit but just redirected to me here)

Thank you very much for your help

Hi! I was wondering if there is a simplier way to remember all of the rules for these topics/is there a group of rules that I have to remember for naming these compounds, ions, or acids and writing chemical formulas.

hi guys, could someone explain whether these are enantiomers, diastereomers, identical, or structural isomers and how/why? It's really hard for me to assign R and S on a Newman projection. Thanks!

Firstly, does it have 3 definitions because it's like a thing we observe but can't really explain just like how nobody can define a chair without over or under counting?

Then what does OH- have to do with it? H+ is a proton so works, but OH- is such a random ion, why does it get the main role in of the definitions? So also tell why is water nuetral and H2S is slightly acidic or why is water nuetral in general?

Hello everyone! Would anyone be willing to tutor me? Just started ‘introduction to chemistry’ and it’s a little complicated.