Carbon Definition and 522 Threads

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...

Is it difficult to make? as a complete beginner, what do I need to know, and am I way in over my head? :) any help would be appreciated.

I'm trying to gather properties of carbon nanotubes and compare them to other materials, but I can't find anything about its thermal stability and electric conductibility. Any suggestions where to search?

Homework Statement Find the ratio of the energies of the K characteristic x rays of carbon to those of Magnesium. Homework Equations The Attempt at a Solution I did it using Bohr's expression of energy...Is there any other method to do it?

Greetings! This is for a Chilled water piping project (1000mm dia max). We are procuring pipes from SEAH Korea, from 250mm to 1000mm. And for calculations for support, load, thrust, etc, i need the following details for these pipes. 1. Coefficient of Linear Expansion 2. Longitudinal Elastic...

Homework Statement im doing a physics assignment on decay have completed most of it and am stuck on a question which i don't understand how to do, cud any1 help urgently? Question is... The cloth shroud of a mummy is found to have a 14C activity of 8.9 dpm g of carbon as opposed to...

Carbon dating!..urgent help needed Homework Statement -- The half life of the isotope 32P is 14.28 days. A stock solution of 32PO43 contained 7659 Bq of activity in 25 cm3 at 09.00 hours on the 7th June. 250Bq of 32P is required for an experiment starting at 15.00 hours on the 19th June...

Carbon dating - urgent please help Homework Statement a) The cloth shroud of a mummy is found to have a 14C activity of 8.9 dpm g of carbon as opposed to living organisms which undergo 15.2 dpm g of carbon. Given the half –life of 14C is 5730 years what was the age of the shroud in years...

Carbon dioxide output?? How would you go about calculating the carbon dioxide output per unit mass and volume for combustion products, i have already calculated the energy outputs per unit mass and volume. Many thanks.

Would it be possible to build a steam engine using parts made primarily of carbon fiber? Any engine?

Carbon dating! A 5g charcoal sample from an ancient fire pit has a 14C activity of 63 disintegrations per minute. A living tree has a 14C activity of 15 disintegrations per minute per 1g. The half-life of 14C is 5730 years. How old is the charcoal sample from the ancient fire pit...

Homework Statement I am just starting an essay on this topic and gathering info from different sources, this is the best source of info i have came across! Homework Equations Do you think it likely that life elsewhere could be silicon based? What are the similarities and...

This is the question which I'm working on: When an animal dies the radioctive carbon content of its body has an activity of 12 counts per gram per minute. Some animal remains are found to have an activity of 3 counts per gram per minute. If the half life of radioactive carbon id 5000 years,how...

"Closing in on Missing Carbon Sink" - ScienceDaily http://www.sciencedaily.com/releases/2007/06/070621140805.htm This article talks about forests and how much carbon dioxide they absorb per year. This reminds me of how almost all data I've seen is based on collecting air samples from ground...

anyone know of a supplier of c.r low carbon steel ie. 1010, 1008, 1002 I can't find a supplier, any info would be appreciated, thanks

Hi, first post! I have a first year exam tomorrow, but I can't find any where which gives a good explanation of the Luders Band displayed in low carbon steel. Can anyone shed any light? Thanks

The half-life of Carbon 14 is 5730 years and the activity of atmospheric carbon due to Carbon 14 is 255Bq/Kg. What proportion of atmospheric carbon atoms are Carbon 14. Attempted solution Decay constant for C14 = ln(2)/t(1/2) = ln(2)/5730 = 1.21x10^-4 Current activity A =...

So I have a spectra of CO that I need to interpret. My guess is that the spectra will depend on the vibrational and vibrational factors but how could I see that? I mean what will that come out like in the Fourier spectra? any tips on this our a site where I can read more about it is...

1. An archeological specimen containing 8.7 g of carbon has an activity of 1.6 Bq. How old (in years) is the specimen? 2. Decay constant for Carbon= 0.693 / 5730 yr = 1.21 x 10^-4 1.6/8.7= 0.1839 activity per gram of C 0.23 is Activity of C at t=0 3. ln(0.1839/.23) =...

Hello! I was wondering if anyone could provide me with any advice on a better interatomic potential than the Lennard-Jones (Mie 6-12) potential for carbon-carbon interactions. I know that L-J fails for metals, but I am not sure how good it would be for carbon-carbon interactions. Are there any...

My understanding is that it would be very unlikely (if not impossible) for a non-carbon based life form to exist because of carbon's incredible ability to bond (it can both get or give up 4 electrons). But silicon also shares this same property. why is organic material so much more common, and...

Non carbon based Alternative renewable fuel sources..Ideas out side of the Box. #1. WIND POWER using a gigantic wind sock. A Wind Drome. Let's imagine a high tensil lightweight material 1000 feet across and 1000 feet high funneling down to an opening only 10 feet by 10 feet at the small end. (...

Hi. I am trying to find information with no luck on google. I am hoping someone here can help point me to any articles or books that talk about how carbon dioxide is taken as a waste residue from an industrial process and purified, and turned into liquid carbon dioxide. But the focus is on how...

Homework Statement I'm trying to calculate Total Inorganic Carbon (TIC) for an experiment in which I have measured pH and Headspace CO2 concentration (%v/v). Approximate values are: pH 7.3 Headspace CO2 2.5 %v/v Homework Equations The Attempt at a Solution I've tried two...

Hello - I am searching for some guidance, and I would greatly (greatly) appreciate any tips, pointers, etc. I am interested in the stability and geometry of nanoscale carbon structures, such as fullerenes and single-walled carbon nanotubes. I am wondering where to begin to develop - for my own...

:smile: Hi I did this simple calculation as a mature student in 1965 & now I need to prove my statement. 'In most hydrocarbon fuels the combustion of Hydrogen H2 gives about 90% of the toal heat' Eg Propane C3 H8 gives 50,350 KJ/Kg, H2 gives 141,790 KJ/Kg I know Carbon is a lump of black stuff...

The effect of carbon content on the Mechanical Properties of Steel? Am I right in thinking carbon content is normally between 0.02% and 1.7% with more carbon making the steel stronger and more brittle? I wanted to find out the basic chemistry behind this, Presumably it's to do with the...

Hi I am just having trouble figuring out this question. If someone can help me out it would be greatly appreciated The imaging drum of a photocopier is positively charged to attract negatively charged particles. Near the surface of the drum, its electric field has a magnitude of 1.40 * 10^5...

Steel is a metal alloy whose major component is iron, with carbon content between 0.02% and 1.7% by weight Carbon and other elements act as a hardening agent, preventing dislocations in the iron atom crystal lattice from sliding past one another Stainless steel has a minimum of 10%...