Carbon Definition and 497 Threads

So, CO2 is said to be non polar because of its molecular geometry. However the carbon atom has two positive charges and the oxygens, one partial charge each. Therefore, why doesn't CO2 dissolve ionic molecules like NaCl? We've been taught that a polar molecule is one that can separate ionic...

Can we make exoskeletons out of CNTs? I have a few questions 1. Do CNTs expand when electricity is applied or you have to put wax betwen them? 2. Can we produce enough nanotubes to make a full-body suit? 3. Is graphene suitable for an armor? Some say that when you put a elephant on a...

I am looking for a fuel for a torch to heat an experiment to 500-1200C. We do not want to introduce exterior sources of Carbon. H2 cannot be used as a fuel because excess H2 will also throw off the results. My professor suggested SiH4, but I cannot find any information on silane as a torch fuel...

Can carbon form four bonds with another carbon?

If raw carbon fiber has strength of say 4000 mpa, how come it is reduced when put in epoxy laminate to become only 950 mpa?

I've been looking into expanding some research time into carbon nanotube synthesis thinking that it was still an obstacle to be able to produce a carbon nanotube long enough to be used for anything. I just found a YouTube video from rice university where they used a wet spin technique to produce...

Hey all, I'm trying to design a clamp that has to hold onto a hollow carbon fiber tube, approximately 2.5 inches in diameter. The clamp will be bearing a 15-20lb load. The carbon fiber will be at angles from 20-70 degrees from a vertical axis. I'm curious if there is a polymer that can be...

Homework Statement An old wooden tool, containing 75.0 grams of carbon, is found in an ancient tomb. The tool emits 500 electrons/minute from the beta decay of 146C. How old is the wood from which the tool was constructed? Given: The half-life of 146C is 5730 years, the ratio of 146C to 126C in...

I recently saw a documentary about our energy usage and how we derive our energy. Obviously it was a pessimistic viewpoint but I think it might actually be true (It's called Blind Spot, I recommend it). One thing about it that spoke to me was that people don't worry about climate change because...

Hi all, I've heard people try to estimate the carbon footprint from the production of cars based on the cost of production. Can such an estimate be accurate at all?

I was told by a professor (I am assuming he was right) that organisms prefer lighter isotopes. So if a tree is in an atmosphere containing 99% O-16 and 1% O-18, the concentration of O-16 in the organism itself (in water, carbon dioxide, etc) will be MORE than the amount in the atmosphere (so...

Seems a bit odd why colour determines if it is absorved or not, doesn't it? My teacher could not answer this question.

iTunes University layman looking for answers and willing to do the work – just need some direction. I now understand electromagnetic waves can be created when molecules vibrate – which they all do. I understand the frequency of the light correlates to the frequency of the molecular vibration –...

Hi, The standard enthalpy of formation of carbon gas or C(g) is the enthalpy change for the formation of 1 mole of carbon gas from its elements in their reference form which for carbon (I believe) is C(graphite). Now I find the following standard enthalpy of formation for carbon gas / C(g)...

Im doing a problem with a simple model of a carbon nanotube. In this we have an electron which is bound to the surface of a cylinder from which there is a radially outpointing electric field. We choose to put the x-axis along the axis of the cylinder such that the coordinate describing rotation...

I will be treating carbon in 3 steps under reflux and I would really appreciate some suggestions, tips and advice on getting a proper and SAFE setup in the lab. I have at my disposal a fume hood and standard laboratory glassware. Treatment 1: 20g carbon treated with 100mL 65% Nitric Acid under...

Hi, Carbon has more affinity to Chromium or Nickel? What is the reason for more affinity to one material over another? Any help would be highly appreciated. Thanks

In the galaxy carbon is on 4th place (after hydrogen, helium and oxygen) In Earth crust it has respectable 15th place. Hydrogen, helium, neon - they are on to the top galaxy popularity list, but are too light to be kept by our planet in proportional amount. Quite a few elements in Earth...

Carbon Brushes are Graphite ... right? I was wondering if the carbon brushes are graphite? and if yes how pure? These days I am in Sri Lanka and can't find any seller offering pure graphite tubes, to be used as a heating element. So I though what if... I could use these carbon brushes...

is there any acid or base or any other chemical which can dissolve carbon particles or tar but will not effect alloys like steel.

Hi guys, I was wondering if it is possible to use raw carbon fiber or fiberglass fibers without any sort of binder or adhesive epoxy in a rope or an unidirectional ribbon as long as the load is uniform, predictable, and in one direction. I think it would be less vulnerable to crack...

Hello, If the distance between carbon atoms is given as 3A, will a 12 gr carbon cube have a volume of (6.022E23)*(27E-24)cm^3?

Hey everybody, a couple years ago, I came across the top gear video for the Arial atom: a ~1000 lbs road legal 'go-cart' with a supercharged I-4 engine with a power to weight ratio of 600HP/Ton. Even though the body is already light, I would love too (once I get the time and resources) build...

This is my problem: I need to design a pipeline distribution system for steam service. But is thought in order to inject high P, high T steam into oil wells (upstream industry). Inlet conditions into the pipeline will be 650 ºF, 1900 psi. Pipes are several km long, and, because it is a network...

Adsorption of Benzene using Activated Carbon - Increase in concentration!? I'm not quite sure where to post but here it goes. I'm performing an adsorption experiment of benzene from solution using commercial activated carbon. It is expected that the concentration of benzene would decrease...

Where can I find the yield strength for AISI 1566 Carbon Steel? I tried googling it but I can't find a reliable value.

Homework Statement CH3CN [ in presence of aq. H2SO4 and 2H2O] → CH3COOH + NH3 The Attempt at a Solution There is a triple bond present between Carbon and nitrogen, hence the first will be sp hybridized, while there is double bond between carbon and oxygen in the second, hence it should...

Homework Statement titration method is more accurate than collection of carbon dioxide over water method to solve stoichiometry equation. Homework Equations what are the 3 reasons? The Attempt at a Solution some carbon dioxide has leak into the air, carbon dioxide is partially...

Hi, I have been working on molecular formula determination for biojet fuels. Can someone help me here please. I need to find out the molecular formula of Neat Algae jet fuel. I have been provided with the carbon-type (n and iso types) mass fractions for blended jatropha/algae fuel and neat...

I have a sample on which I think carbon is formed physically but not chemically. What is an analysis technique to determine that there is carbon for sure?

I have difficulties in finding the true black carbons in a diamond from an image. Since diamond has a high refractive index of 2.42, it has a critical angle of 24 degrees such that total internal reflection can easily occur (total internal reflection causes fire in diamond) . Now I have...

Hi guys, I've come across an abnormality at work with regards to Carbon Content. The raw material used was 1010 CHQ which should have a carbon content of 0.08 - 0.13. However after going through a cold-forging process, we tested the final product and found that the Carbon Content...

One thing I am not able to understand. Governments advocate the slow phasing out of the filament lamps and replacing them with CFLs.The reason repeatedly cited for this is that the filament lamps contribute to the global warming by way of emitting carbon-di-oxide. But, interestingly, it is...

Homework Statement I know that the process of fermentation occurs in two steps, however, in the second step where glucose/sucrose is broken down into ethanol and carbon dioxide, is the carbon dioxide expelled as a gas or in an aqueous state? (I'm assuming water is involved here)Homework...

We are looking to produce a spray changes colour when it comes into contact with Carbon Dioxide. Ideally this would be colourless when sprayed, but become a visible "smoke" where carbon dioxide is present. Failing this, we are open to a white "smoke" that changes to coloured where Co2 is...

Hello Can use Carbon to create Diode instead of Silicon-germanium ? if yes why we don't have carbon diode? what is advantages and disadvantages?

Hi, I'm going to school for mechanical engineering and I am interning at a water filtration company. I always come here for help on hw, and I see it as a good source of using my references available, so why not come for real life problems too? Here is the situation: I need to transfer...

Is it dangerous to compress carbon dioxide under high pressure?

What happens to carbon monoxide when compressed or put under high pressure?

If carbon dioxide is the gas we exhale and is not healthy to breathe back in, then howcome they put carbon dioxide gas in tonic water?!

Hello this is me first post on here i don't know if this would be the right section but I'm trying to design and build this spring to only deflect 2-2.5 inches the force on it will be 200 pounds falling from 6 feet and coming down on the the two circles. my problem is i need to learn how to...

I don't know much about this, only looked into it a bit yesterday. If you know more or can find out something, please contribute. Abraham Loeb (eminent Harvard astroph.) says, if I understand him correctly, that light from stars richer in heavy elements than the sun has been observed at...

carbon dioxide is heavier than air, so how there is a layer of CO2 is forming around the atmosphere?

I've been searching the posts here and I think this question may be a little below most of you. I've cobbled together a homemade biogas generator and I'm wanting to improve the quality of the biogas by removing some of the CO2 (or all of it if I can) which will leave me with a higher calorific...

Homework Statement A small animal bone fragment found in an archaelogical site has a carbon mass of 155g. When the animal was alive, the ratio of radioactive 146C to the stable 126C was 1.31×10-12. What was the number of 146C nuclei found in the sample when the animal was alive? Homework...

I'm interested in the theoretical minimum number, so like the extruded buckyball ball? I'm trying to work out if there are enough carbon atoms in a 'piece of paper' to reach the moon. :) Which brings me to the next question : how many carbon atoms are there in a piece of paper? Or...

We did several threads about carbon dating. Main message, you've got to know what the caveats are and then it's a good and reliable way to estimate the age of organic material from the last 50,000 years. A major point is calibration, which is improved and refined every few years. There is...

Specifically, could Venus have otherwise formed as one, while leaving the rest of the structure of the solar system pretty much intact? Failing that, could one have formed anywhere in the solar system?

This ought to be simple, I think. But I haven't found a consistent way to think about things yet. Is it as simple as adding up all the spins of the elementary particles in the particle and checking whether the total has inter or half-integer spin? Homework Statement State whether the...

as a process worker may someone with more technical knowledge answer question below please 1. we have a juice which contains some Carbon.I am finding it harder to evaporate due to the Carbon.Why is juice harder to evaporate with Carbon in it then juice without Carbon? Cheers Trent H