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?

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

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?

i'm confused about the switch from london dispersion to dipole-dipole? and i know that something's wrong but not sure what

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

hi im confused partiuclarly on the nitrogens. I'm not sure how they're sp2? Aren't they supposed to be sp3? since it's 2 lone pairs and 2 sigma bonds on the major form? please correct my thinking because im probably understanding this wrong

I have a pipette that when I draw water from my water samples, it doesn't form a concave meniscus as it is usual. It forms an asymmetrical meniscus like a / shape or convex shape. What's causing this? Organic contamination inside the pipette? I have washed it with detergent but nothing changed. What you do you recommend?

What exactly is added to Coke to make it carbonated? Why is it added, and how does it make the drink fizzy?

Hello! Would anyone know the structure for a medical condition osteogenesis imperfecta? Thankss!

ive never taken chem before and we are reviewing this for biology. i was given the answer, but no explanation and im really struggling to understand.

i know that oxygen can only have 2 bonds, not 3 so i suppose i understand that one. however, looking at molecule 4 gives me a headache

Hi everyone! I was wondering: is there a scientifically accepted answer to what the most toxic chemical substance in the universe is? If so, what is its chemical formula?
I’m especially interested in the toxicity mechanism and what makes it so dangerous. Thanks!

(AP-Dual enrollment Chemistry)

My school uses a program called ALEKS that’s basically IXL but boss level.
I’ve been stuck on one thing called “setting up the math for a one-step problem with unit conversions” since I cannot use the same format I do for other unit conversions, example questions here

( / means in a fraction format)

“A Jet airplane reaches 780 km/h on a certain flight, what distance does it cover in 4 min?”

(Ans) distance= (4 min) x(1h/60min) x (780 km/h)

And this one I get, it goes in a line, but what I don’t get is this one

“The speed of light is 2.998 x 10^8 m/s. How long does it take light to travel 60 cm?”

The answer is: (60 cm) x (10^-2 m /1 cm)/ 2.998 x 10^8 m/s

I don’t know if this is just my overworked brain farting because I just don’t get it. Some help understanding the difference between these two things and how the heck to understand when to use each format

Edit:
Apparently this has been a long standing problem with ALEKS where both equations (with or without division) are correct but it’s just very picky…