For the synthesis problem above, the answer I'm given is:
1. 3 NaNH2, mineral oil, heat
2. MeBr, DMF
3. H2, Pd

I really don't understand the reasoning behind these steps. If anyone could explain how to do this synthesis, I'd be very grateful.

Okay, a few weeks ago I posted a question related to cholesterol's structure. Little did I know it, but the lab write up in question was a two parter, and this week we used Thin Layer Chromatography to characterize the cholesterol we isolated from a calf brain a few weeks ago.

My issue is, I love biochemistry, but not so much the chemistry part. What I am wondering is how to rationalize the results that I got on my TLC plates:

Plate #1 was placed in a chloroform/methanol/water (70:25:3) solvent

Plate #2 was place in a hexane/ethylether/acetic acid/methanol (90:10:1:5) solvent.

Solvent #1 is clearly more polar COMPARED to Solvent #2.

My knowledge of chemistry pretty much stops at "like dissolves like" which would imply that cholesterol, being largely non-polar aside from the one little -OH group would travel farther in the non-polar solvent. However, the results show quite the opposite. Cholesterol travelled WAY farther (pretty much all the way to the solvent front) in the polar solvent than the non-polar solvent, in fact it travelled even farther than the more POLAR phospho and sphingolipids that I was also characterising.

I can't wrap my head around this. How does one little -OH group get dragged all that way in a polar solvent when cholesterol is a big fat rigid set of rings?

I need some serious help. I hate chemistry so much that I'm seriously considering switching over to some fluffy liberal arts major because I cannot stand the thought of another semester of it. I don't even know how to go about solving this problem:

A compound of carbon, hydrogren and oxygen was burned in oxygen. 1.000 g of the compound produced 1.418 g CO₂ and 0.871 g of H₂O. In another experiment 0.1103 g of the same compound was dissolved in 45.0 g of water. This solution had a freezing point of -0.0734C. What is the molecular formula of the compound?

I don't want the answer, I just don't understand how I'm supposed to piece these things together and come out with a molecular formula. Don't I need the freezing point constant? What am I supposed to do with how much CO₂ and H₂O was produced when the substance was burned in oxygen?? I've looked through all of my notes, my book, and online sources for a similar problem but I haven't figured it out.

Title: Pardon Each Other Our Follies
Author: fridayschild85
Characters: Elliot, Olivia
Rating: R for Elliot's mouth
Spoilers: Off the top of my head, just "Fault" and "Zebras"

If they ever get out of this, Elliot will kill her for being so reckless.

Can you separate love and sex?

I know it's a very personal question, and I hope no one feels obligated to answer here, but it's a popular myth: That bisexuals can happily have sex with men and women, but can only have romantic feelings for one gender.

( Details, deatils. )

Just a quick note - this is officially beginning my internet hiatus.

I have a screenplay to write that I'm far, far too behind on, a sound design project to finish, and a major test. All within the week. While I go to classes and work. And there is no way I'll get everything done if I spend time on the internet.

I'll be away from LJ for sure, and AIM/MSN/Twitter *probably*. Those'll be the hardest. :P I'll probably pop in once a day to just check in, but I won't be around for any extended period of time. I am far too addicted for my own good.

Lol @ me needing to make a post about this.

SO BASICALLY if you need to get in touch with me over the next week, texting, DMing, emailing, or LJ PMing is the best way to go - I get all that stuff to my phone so I'll see it. And I won't scorn you, promise. :)

Okay. Internet hiatus begins............... NOW.

See you at 5:30 pm EST on Monday the 7th! :D

Hey Everyone,

My name is ANGeL, from Suriname. Just in case you don't know where that is, well, it's in South America, north of Brazil. Now, coming from a slightly homophobic place, I had quite some trouble coming to terms with my sexuality. Luckily, my friends have been pretty supportive; of course I'm not fully out yet. Anyway, I'm very happy to be bi; keeps my life interesting. With that said, I think nuff about me for now.

I'd like to get to know people who are just like me, sharing similar problems perhaps, although it's not limited to just problems. Feel free to talk to me about anything! I would love to make some new friends!


~XoXo~
ANGeL

Hi,

I hope everyone had a nice Thanksgiving!

I need general clarity of Single Replacement and Double Replacement Reactions. Can anybody help?


Single Replacement:
Zn(s) + 2Hcl(aq)----> ZnCl2 + H2

IE: Double Replacement:

Na2SO4(aq)+BaCl2-------> BaSO4(s)+2NaCl



Thanks in advance!!