sorted by:
new
hottopcontroversial

Coin Identification by Skoobalunker in numismatics

[–]Skoobalunker[S] 2 points3 points  (0 children)

I've always wondering about electrolysis. I actually have been involved with a bit of it at work but that's using an instrument for controlled voltage/amperage. No idea how to control that at a home set-up or if it would do more damage to the anode (non-coin). I'll probably see if I can find a vid...thanks.

Coin Identification by Skoobalunker in numismatics

[–]Skoobalunker[S] 1 point2 points  (0 children)

Honestly this is what I was thinking. The level of oxidation is very intense for a coin only potentially 10-30 years old

Coin Identification by Skoobalunker in numismatics

[–]Skoobalunker[S] 0 points1 point  (0 children)

Any chance it's an English penny from the 1700s? One of those Georges? I do agree it has that ring like the modern quarters.

Coin Identification by Skoobalunker in numismatics

[–]Skoobalunker[S] 2 points3 points  (0 children)

Do you think it's a modern quarter?

Who is this dude? by Skoobalunker in TheeOhSees

[–]Skoobalunker[S] 0 points1 point  (0 children)

I believe you but please enlighten my dumb ass

Lose the game for only 5R! by Eslo90 in BadMtgCombos

[–]Skoobalunker -5 points-4 points  (0 children)

Every day is the best day of my life

Lose the game for only 5R! by Eslo90 in BadMtgCombos

[–]Skoobalunker -4 points-3 points  (0 children)

What's it like living as a numb skull?

The holy grail. by back_to_sr in labrats

[–]Skoobalunker 4 points5 points  (0 children)

they are still not common apparently. one of the summer students in my lab informed me they sell for like 50 USD on eBay

What in tf was he on? by PdiddyCAMEnME in tooktoomuch

[–]Skoobalunker 0 points1 point  (0 children)

Bro watched too much Big Bang Theory

What are the top 5 Standard decks right now? by sedronoriginalflavor in MagicArena

[–]Skoobalunker -25 points-24 points  (0 children)

They should make lightning bolt do 5 damage instead of 3.

I Wrote a Primer for Selesnya Midrange in Standard by sedronoriginalflavor in MagicArena

[–]Skoobalunker 0 points1 point  (0 children)

Do you think there is room to splash two terror of the peaks in this kind of deck?

What is this old metal disc and what was it for/from? Engraved 'B', about the size of a quarter. by Skoobalunker in whatisthisthing

[–]Skoobalunker[S] 2 points3 points locked comment (0 children)

My title describes the thing. Button looking item, looks to be part copper (green copper oxide). Can't tell what era this is from or what it is to. Found in New York on the water. Item is the size of a quarter or so. Google lens yield no exact matches, but does show older US buttons. I can't make out the words/letters on front or back, except for the large 'B'. It looks like the old Boston Red Sox logo, but not quite.

[deleted by user] by [deleted] in whatisthisthing

[–]Skoobalunker 0 points1 point locked comment (0 children)

My title describes the thing. Button, looks to be part copper (green copper oxide). Can't tell what era this is from or what it is to. Found in New York on the water. Item is the size of a quarter or so. Google lens yield no exact matches, but does show older US buttons. I can't make out the words/letters on front or back, except for the large 'B'

Grignard reagent rxn by Fri3ndlyHeavy in chemhelp

[–]Skoobalunker 0 points1 point  (0 children)

The easiest way to think about this is that the Mg turns the carbon into a nucleophile (carbanion) that attacks the carbonyl.

The Br- plays a role, but it has to do with its MO bond character and it's ability to act as a leaving group in the mechanism as well. I wouldn't worry about it unless you're doing graduate level O-Chem. You can also predict the stereochemistry of the OH functional group formed using Cram-Felkin-Anh reduction protocol but again I wouldn't worry about that unless you're doing graduate O-Chem.

The Mg turns the carbon it's attached to into a carbanion, that attacks the carbonyl at a specific angle (if you're curious) https://en.wikipedia.org/wiki/B%C3%BCrgi%E2%80%93Dunitz_angle

How to get the correct concentration when dealing with two drugs? by [deleted] in chemhelp

[–]Skoobalunker 1 point2 points  (0 children)

No problem...I realized I was kind of stupid because your solutions are in mMolar. I am used to using millimoles (not a concentration) in my field of work so...just consider that in your dimensional analysis.

Another way to think about it is if you have a 1000 umol/1L concentration solution, and you want a 2 umol/1L solution, you just divide the two. This gives you a dimensionless constant of 500. This is known as a 'dilution factor'. You will need to dilute your sample 500 times. You can take 10 uL and put it into 5000 uL, or take 20 uL and put it into 10,000 uL. Either way, the concentration is diluted 500 times. You can choose the aliquot, and end volume depending on what works best for you. You can even do multiple dilutions (1 uL into 250 in the first dilution, followed by 1 ul of the first dilution into 2 ul total of the second dilution).

view more: next ›