Carbon Definition and 497 Threads

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...

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...

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%...

Can someone help me in finding information on the classical treatment of the potential in a carbon nanotube.

Hi, I have the following problem, for which I am not sure if i should be making assumptions. "a solid fuel assumed to consist of carbon and hydrogen only is burnt in air. an analysis of the dry products of combustion yields the following results: Oxygen, 02 = 5.45% Carbon dioxide, CO2 =...

as there are dienes, trienes, qua-enes, etc. allenes and what limits it or prevents it from continuing on. i.e c=c c=c=c diene c=c=c=c triene-enes (c=c=c=c=c=c=c=c)n with each end "capped" by a -CN

from UPI Materials: Carbon nanotubes in an ancient Damascus sabre Nature 444, 286 (16 November 2006) | doi:10.1038/444286a; Received 24 July 2006; Accepted 25 October 2006; Published online 15 November 2006 http://www.nature.com/nature/journal/v444/n7117/abs/444286a.html M. Reibold1,2...

Hi All, I m designing a carbon monoxide detector circuit, I bought the MQ307A carbon monoxide sensor but unfortunately i was not able to find on the net any useful documentaion related to it :( Please I urgently need your help to solve this problem All i found out is the datasheet but...

I'm developing a range of carbon fiber cases for guitars, violins and laptops. The cases have a suspension system of high density closed cell foam pads which hold the instrument where it is strongest eg base of the body, where the neck joins the body. It has been suggested that it would be...

when i was using Scanning Electron Microscope to investigate fracture surface of a metal sample,the results of composition of it appeared so different to what the composition should be, that sample contains 2% carbon comparing to normally 0.1%. i thought there are 3 ways of doing that...

Hey all, :smile: I'm new to this board. I really think it's great, and I love to visit whenever I have the time. Mainly to read. But now I have a question. I recently did an experiment forming carbon from sugar and conc. H2SO4, but the precipitate is so fine it emmediately clogs the...

I was doing a test on the other day and i came across a question.The question is: What is the element that cannot exist naturally in Earth? A.Gold B.Silver C.Carbon D.Sulphur I choose carbon,but my tuition teacher said he thinks it is sulphur.He wasn;t very sure of his answer...

I think that I mentioned here sometimes that more CO2 would mean more biomass and that the annual fosil fuel use would produce enough carbon to reforest an area as big as France. Guess what's happening: http://visibleearth.nasa.gov/view_rec.php?id=2138

Hello, this is my first post on yours forum, I thing it’s great. I’m reading it for some time. But I’ve registered because of problem. I’m an archeologist. Within archaeology C14 Radiocarbon dating, a radiometric dating method is considered an absolute dating technique. But in discussion with...

could you have a long chain of c=c carbon double bonded to carbon each carbon would be sp hybridzed, with two pi orbals bonded to adjacent carbons c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c=c going on for millions or even billions of repeating elements which would be in resonance c-c...

The first half time of radioactive carbon (14C) that got some consensus is the Libby date of 5568 years, which is still used.. See Wikipedia The latter is very fortunate, calibration tables, like the current INTCAL04, being independent of half times for determining age. So calibrated...

The subject of cow flatulence and methane causes me to wonder what happens to the carbon in the grass that grows and dies naturally. When grass rots, how much of the carbon is converted to soil thus trapping the carbon, and how much carbon is released as CO2 or methane? I assume that this...

Greenhouse Gas Effect and Carbon Dioxide I have been having some difficulty with this, so perhaps someone could please sort out any mistakes, and let me know. Consider a vertical column of the Earth’s atmosphere based on a square of area 1 m^2. This air column has a mass of 1.01×10^4...

# A rod of flint glass when immersed in carbon disulfide becomes almost invisible. It is said that it is because both have same refractive index. What I don’t understand is just because they both have same refractive index, why does it become invisible?

A low temperature flame that melts carbon?? I saw this on television the other day. I have no idea how it works. It sound promising but so have a lot of other things in the past. There is a clickable news video in the link. http://freeenergynews.com/Directory/RhodesGas/index.html

Hello, I'm just wondering, is it fine to predict the age of fossils older than 10,000 years with Carbon Datin? After all, I think nobody knows how much carbon-14 there was back then, and whether the animals consumed less or more carbon-14 than now. How exact are such long-term predictions?

Does anyone know the difference? Specs and such? Thanks

We know that http://en.wikipedia.org/wiki/Pyrolytic_carbon" layers will have an omni directional cleavage and possibly an omni directional Diamagnetic field. Also, could a http://www.ebteccorp.com/lasercut.html" cut such a thin sheet of Pyrolytic carbon to transparent thickness, If not then...

This is supposed to be an easy question, but I appear to be slightly lost. Can anyone give me a hint on what to do here? when waves of wavelength lamda are diffracted by a circular disc of diameter D the first minimum in the intensity of the scattered waves occurs at a scattering angle z...

Me and a friend are having alittle argument about whether arsenic which kills carbon based life forms would kill silicon based lifeforms. I think it still would kill silicon based lifeforms but he thinks it won't, can someone please help me. Thank you

what is your knowledge about carbon ions? is there a machine that determines its creature?

the question a mummy contain 9.2 g of carbon and it has an activity of 1.6 Bq. how old is the specimen in years? i worked out the question and got an answer of 2300 yrs, the closest answer in the book is 2200yrs. is my answer of 2300 yrs correct?