Carbon Definition and 497 Threads

The on on the left w/ the red arrow pointing to it: http://img198.imageshack.us/img198/5062/92513846.jpg

i am trying to understand what a pseudochiral carbon is? please help thanks in advance

Homework Statement How many sp3-hybridized carbon atoms does tamoxifen possess? This is tamoxifen: http://en.wikipedia.org/wiki/File:Tamoxifen_Structural_Formulae.png2. The attempt at a solution Are all carbons sp3-hybridized? Does the hybridization of carbon vary, depending on the bonds (ie...

Will carbon powder dissolve (ionize) in sulfamic acid? If so, what ionic state?

If direct current is applied to activated carbon, will it be drawn to the cathode?

Hi, first time poster. Quick question: Why is the bond energy for a bond that contains a more highly substituted (tertiary) carbon weaker than the bond energy of a bond that contains a less substituted (primary) carbon? Let me clarify with an example. Say Bond A is a single bond between a...

I have two questions about carbon steel. How does the carbon content of steel effect the rate of corrosion? Apart from providing strength to the steel, how does carbon effect the properties of steel?

http://www.rsc.org/chemistryworld/News/2006/November/15110602.asp Carbon nanotubes are no longer the proud boast of 21st century materials scientists. It appears their discovery was unwittingly pre-empted by mediaeval Muslim sword-smiths whose tough Damascus blades taught the Crusaders the...

Does anybody know the acoustic properties of carbon fiber. I've used google extensively but I've had no success. Is there a well known reference book within the materials engineering realm that gives the sound absorption coefficient (also known as the Noise Reduction Coefficient (NRC)) of varius...

If diamonds are made of carbon? and coal is made out carbon, why are diamonds transparent and coal is not transparent?

Carbon dating like techniques...Reliable or not? Hello, As I have learned Carbon, uranium & other elements of radioactive nature are now used for dating how old an object is... I am wondering how does this technique work exactly & how reliable it is... The only samples which are the basis...

Hi guys, i have been searching for ages to get figures for the proof or yield strength of EN1A steel, which is now known as 220M07 as per BS970. I have managed to obtain the Tensile strength, but would anyboday please be able to help point me in the right direction to data for the yield or...

hi, i can't find any standard defining design of unfired pressure vessels made from carbon fiber, kevlar, fiberglass or similar high tensile strength materials*. do standards like these even exist, since these materials are relatively new? * you know any more similarly competitive materials...

Homework Statement Natural carbon consists of two different isotopes (excluding 14C, which is present in only trace amounts). The isotopes have different masses, which is due to different numbers of neutrons in the nucleus; however, the number of protons in the same, and subsequently the...

Hello, I am searching for the properties of Carbon Steel S355J0, can anyone help me out? N360

In the reaction of carbon dioxide and water to form carbonic acid, does water act as a lewis base because it donates a pair of electrons to carbon dioxide or does carbon dioxide act as a Bronsted-Lowry base because it accepts a proton from water? Thanks.

When air goes through a carbon filter it separates the carbon and turns it into water and lithium carbonate. Could the lithium carbonate be sold and that money used to buy parts for hydro electricity plants that use the water, or the water be used for drinking as it is already pure?

Hi everyone, i wonder if anyone has an idea how to attack chemically an amorphous carbon film. Is it possible to completely dissociate an amorphous carbon in a chemical solvent? thanks for your help

I've been trying to remove a benzyl protecting group of a phenol and also remove a CBZ protecting group on a secondary amine by standard hydrogenation of the material with 10% Pd on Carbon. My protected molecule is very lipophilic and soluble in DCM. The reason I added methanol was because the...

Homework Statement A typical electromagnetic signal from a communications satellite might have an intensity of 0.9 pW/m2 at the surface of the Earth. Your satellite dish collects the energy of the electromagnetic signal from the satellite; then your dish passes that energy to its central...

Homework Statement The amount of 14C in an old, isolated sample of vegetation is 0.692 that expected from a present day sample with an equivalent carbon content. Calculate the age of the old sample in years. Homework Equations Im fairly sure you use the following equation to solve...

I'm a sophomore Aerospace major, and I'm also a new member to a rocket student group at my university. We are currently involved in a competition with NASA, and they have asked our group to write a Preliminary Design Review. Everything was split up, and I was left with the rocket's airframe...

This is a 3 part question that i have attempted to answer. I'm pretty sure I'm on the right track but i think i made 1 or 2 small mistakes along the way. the question states: The average depth of the ocean is 3.8km and the ocean surface area is 360x10^12 m^2. The average upwelling rate of deep...

My first semester bio course is having us practice writing formal lab reports by doing some research through peer reviewed journals our university has access to and citing it in our paper. however something that keeps coming up in the papers I'm reading is something called "the carbon...

Hi to all i would like to ask is there a way of getting burnt carbon out of the used oil i have tried all i can think of but still can't get it all out is their a bleach or some thing i can use please don't tell me about the old trick with a rope it takes to long Thanks

Hi all,sorry if i commit any mistake while asking this question. Actually right now i am studying FEYNMAN lectures of physics vol.1.ON page 7 of chapter1 it is written and clearly understood that Carbon attracts Oxygen much more than carbon attracts carbon or oxygen atttracts oxygen. But if...

Homework Statement 6CO2 + 6 H2O → C6H12O6 + 6 O2 Now suppose the above reaction is allowed to proceed in both directions, and has reached equilibrium. How would increasing the concentration of oxygen change the concentrations of carbon dioxide and sugar? Homework Equations The Attempt at a...

How to 'produce' martensite and bainite? For what i know, martensite formed by rapid cooling from austenite phase of steel, and slow cooling to form back to it's original state. But in order to form bainite, what's the cooling rate? intermediate between rapid and slow cooling? How rapid and...

Homework Statement In a sample of one litre of carbon dioxide at STP an average of 5 disintegrations C -> N + e + v are observed per minute. Calculate the atomic fraction of C present if the mean lifetime of this nucleus is 8267 years. Homework Equations \tau = \omega-1 = 8267...

The question that I have is regarding the hybridization of the Carbon atom in the molecule Carbanion [CH3]- My question is Why is the carbon atom in Carbanion hybridized to sp3 orbitals instead of sp2? shouldn't it be sp2 since the carbon atom is only making 3 bonds with...

hi this is probably basic physics but how do u work out specific charge of say the nucleus of a carbon atom? thanks Marco

Hi, Please, does someone know the “energy density” of Carbon Monoxide – CO? I would like to know how much energy gives the combustion of Carbon Monoxide with Oxygen. Also it would be great (if it is possible) to know approximately the temperature of the flame when burning in oxygen. I...

Six days ago, the Dutch government added a flight fee at Schiphol, the Amsterdam airport, to be used to lower Earth’s atmospheric carbon dioxide (CO2) levels. The Netherlands is one of the four countries that tax carbon put into air in response to advice from the UN-sponsored Intergovernmental...

Can anyone help me with few info abt carbon di oxide lattice

You've probably heard about the isolating material asbest which was used a lot around the turn of the 1900's. It got these long fibers that pierces the cell and accelerates rapid cell growth. This cell growth more than often gives the recipient cancer in the lung. In the recent issue of...

Homework Statement C6H12O6\rightarrow 3CO2 + 3CH4 \DeltaH = -132 kJmol-1 C6H12O6\rightarrow 2CO2 + 2C2H5OH \DeltaH = -68 kJmol-1 1. Calculate the oxidation number of carbon in each of the products of the first reaction. 2. Comment on the relative advantages and disadvantages...

Hi, Got into a discussion at School today about reducing energy consumption at home in order to save the planet. I asked a question that stumped my Physics teacher. If I do turn off my lights and TV when I'm not in the room surely the fossils fuel would have already been burn and the...

2 quick ochem questions... 1. Why is a carbon oxygen double bond more thermodynamically stable than a carbon oxygen single bond? 2. Can -OH be a leaving group in basic conditions, it would seem strange to protinate it in basic conditions? Thanks!

Hi, In vinyl radical, CH2=CH* (* -unpaired electron) what is the hybridisation of the carbon carrying the unpaired electron?

I hear many who believe that AGW is caused primarily by CO2 emissions in the atmosphere. I also hear from others that water vapor covers the same wave length in absorbtion. With more than 90% of the greenhouse gases being water vapor, what is the basis for the case concerning the influence of CO2.

We all know that hydroxide will never be a leaving group in an SN2 reaction, no matter how strong the nucleophile. Yet an intermediate containing R-O- is created when a nucleophile adds to a carbonyl compound. It looks sort of like a leaving group, but it's still attatched to the molecule...

Hey all, I wonder if anyone can answer this for me: Why hasn't carbon fiber been used to make better bulletproof vests (ignoring cost)? Doesn't carbon fiber have a higher tensile strength than Kevlar? Isn't it lighter? Also, wouldn't a solid version, of carbon fiber reinforced plastic...

In the 18th century methane was made from carbon dioxide (from the air) and hydrogen (from water) and used as the fuel for the lights of the "Gaslight" era. Seems to me, that if we could take carbon dioxide out of the atmosphere, add hydrogen and obtain methane, a very clean burning fuel, we...

Homework Statement The total mass of carbon in living systems is estimated to be 7.7x10^17 g. Given that the total mass of carbon on Earth is estimated to be 7.7x10^22 g, what is the ratio of carbon atoms in living systems to the total carbon atoms on Earth? Report your answer in percent and...

http://www.ciw.edu/news/dirty_space_and_supernovae

Hello everyone. Right now I'm learning about carbon electrical properties for my final assignment in college. But somehow i just can't find the intrinsic carrier concentration properties for carbon. I've found the graphics that show me the relationship between the intrinsic carrier...

A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00(Degree C.), the resistance of the carbon resistor is 218.0(Greek "w') . What is the temperature on a spring day when the resistance is 215.8(Greek "W")? Take the temperature coefficient of resistivity...

Has study or experimentation been done on chemically and isotopically pure carbon at very low temperatures? Thanks, Rich Peterson

[SOLVED] Carbon Nanotubes I'm doing some work with carbon nanotubes, their history, their uses, technology that incorporate them, and generally looking into the field. Can anyone tell me any reputable sources for information regarding current research in carbon nanotubes? Are there any...

As described in this report, the limits on the strength of stable magnetic fields are due to the magnetic forces on the conducting elements that tend to tear them apart: Magnetic Radiation Shielding: An Idea Whose Time Has Returned? Geoffrey A. Landis "The limit to the mass required to...