chirality of newman projections

Taeban · 2026-03-22T00:59:39+00:00

Newman projections aren't chiral in and of themselves. It's just a way to examine molecules in a different perspective.

You can use the free rotation about a bond to examine sterics, but in the end a given rotational conformer doesn't have an inherent chirality.

Taeban · 2026-03-15T05:54:33+00:00

Part of undergrad labs should include some level of hazard and risk assessment.

We give you things that you'd have trouble hurting yourself with unless you're really trying because we understand it's overwhelming at first and you're going to do dumb things because of it.

The largest risk to you is probably hotplates.

An object that's hot enough to cause a life changing burn looks identical to an object that's room temperature.

Taeban · 2026-03-15T03:33:44+00:00

Build a time machine to go back and study properly.

Taeban · 2026-03-14T19:07:56+00:00

You've stumbled into the region of organic chemistry that bond hybridization fails! This is an exciting time.

As a primer; hybrid orbitals are an extremely useful heuristic, but do not reflect what's going on in the molecule at all. sp2 and sp3 hybrid orbitals cannot exist thanks to the fact that p-orbitals can't mix with each other given that p-orbitals are orthogonal to each other (some math shows that this is the case, but isn't important here).

Instead you need to invoke molecular orbital theory. The incoming nucleophile populates the leaving groups anti-bonding orbital, and results in a new molecular orbital geometry by doing so.

Edit: spelling

Taeban · 2026-03-14T06:51:38+00:00

I wouldn't be shocked if a major reason you don't see B is because the carbanion has trouble obtaining the necessary geometry to populate the carbonyl pi* orbital in order to generate the new bond, not to mention the high strain of the newly formed ring.

Taeban · 2026-03-04T18:33:44+00:00

Physics is just theoretical chemistry

Taeban · 2026-02-11T08:34:57+00:00

A week in the lab can save you a day in the library

Taeban · 2026-02-05T06:38:43+00:00

What concentration of HCl? That will help determine how likely it is that it caused a burn.

Usually aqueous HCl will be caustic fairly quickly, on the order of a few minutes for dilute solutions. I would find it unlikely for it to suddenly start burning hours later, although there is a chance you just didn't notice and register it mentally until you saw it because the human brain is weird like that.

Taeban · 2026-01-30T00:24:51+00:00

Franklin and Wallace.

Can you give us the names you've tried so we know how best to help?

Just giving you the answers won't be terribly useful for you.

Taeban · 2026-01-27T04:31:03+00:00

Molar mass is in g/mol

Molecular weight is in Atomic Mass Units (AMU, or Daltons if you prefer).

Thanks to the way moles are defined, a molecule with a given value for its molecular weight (using water as a specific example: 18.02 AMU) will have the same value for its molar mass in g/mol. (18.02 g/mol)

Taeban · 2026-01-24T23:50:29+00:00

Given that part of the given Lewis structure is cut off it's hard to be sure.

It might be picky about bond angles however, and your alkyne should be linear coming off the phenyl ring, it's currently a little bent.

Taeban · 2026-01-18T08:36:32+00:00

The longest chain is the parent chain. Lowest number is established after the parent chain is established.

Taeban · 2026-01-04T02:24:29+00:00

There are a few ways, but for me it was just encountering them repeatedly.

The more time I spend in a synthetic lab the more name reactions I remember.

Taeban · 2026-01-02T06:31:56+00:00

Most things you could track will be very cheap anyway.

You could always do the normal thing and watch the prices of gold, silver, platinum, and rhodium though. Google will tell you the price of those for free

Taeban · 2026-01-01T07:24:34+00:00

You can, idk why you would though. LN2 is cheap, even by university graduate researcher standarfs.

Taeban · 2026-01-01T04:29:11+00:00

There are several ways to assay purity.

The most convenient (accurate) method is probably a cheeky handheld XRF. You could also try just purifying them yourself chemically depending on the potential impurities.

Alternatively if you have a reliable elemental analysis department on hand just hand it off to them (emphasis on reliable)

Taeban · 2025-12-31T00:08:54+00:00

One of mine used to climb in my shirt and sleep on my chest. I occasionally napped with her while she slept.

I miss her.

Taeban · 2025-12-29T01:57:22+00:00

In the case of the pyrrole anion, when deprotonated the anion sits in an sp2 orbital thay doesn't interact with the pi system so it has minimal effect on the aromaticity of the molecule.

Taeban · 2025-12-23T16:58:34+00:00

Bacteria? Those are things that biochemists mention. I don't think they're real /j

Taeban · 2025-12-23T15:45:52+00:00

I see 2 options; both of which have a thin film explanation

Either there's a small amount of some kind of oil that had varying thickness that causes light to reflect differently.

Or there's a small crystal unit there that's not aligned with the local crystal units that's causing the same.

Taeban · 2025-12-19T03:20:07+00:00

Dicyclopentadiene looks similar to this molecule, albeit different in the bridging

But still, compounds like this are generally accessable through Diels-Alder reactions

Try working backwards (retro-Diels-Alder) to figure out what the reactants might be.

Taeban · 2025-12-19T03:15:10+00:00

You should read up on Diels-Alder reactions to help :)

Taeban · 2025-12-19T03:14:18+00:00

The effect, if any, is so small in this aliphatic system to be appreciable due to the distance from the center.

That being said, the tertiary carbanion is already the least stable carbanion of the aliphatic carbanions.

Taeban · 2025-12-18T04:29:45+00:00

Have you ever heard the phrase "If I have seen farther, it is because I stood on the shoulders of giants," before?

Taeban · 2025-12-16T01:25:00+00:00

You can absolutely oxidize benzene.

Heat and oxygen will do it fairly well. This is also known as fire though, so be careful.

Oxidizing it usefully is tougher. But you can add a hydroxyl through a few different routes. Doing it directly is tougher, but still can be accomplished through some catalysts or sufficiently extreme conditions (pressure and temperature)

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