Carbon Definition and 497 Threads

I am curious about the standard enthalpies of formation of carbon nanotubes, diamond, carbon buckyballs, graphene, etc. I read from physics forums that the standard enthalpies of formation of these allotropes of carbon are small. However, since diamond is fabricated naturally under extreme...

I am trying to find out the heat of combustion of one kilogram of carbon dioxide with magnesium. I am looking for results for stochiometric conditions of these two reactants. I have found the following equation online 2 Mg(s) + CO2 ---> 2 MgO(s) + C(s) yields a standard enthalpy of --810.1...

I would like to know parameters of this material, such as: ##\epsilon##, ##\mu## and ##\sigma##, for EM simulations with CST. I can't find anything similar to carbon fibers or general plastic in the CST material library. Google is not helping me this time. Does anyone know something more on this...

If you remove (seperate) all 8 hygrogens of atypical polymer Styrene. Does is make both inert Carbon and inert Hydrogen? Thank you! John

Hello, thanks in advance. I'm trying to make a near 100% solid carbon fiber wing. I'm vacuum bagging the top half of the wing and the bottom half of the wing separate. After making sure there is a thin 2mm gap b/w the center of both halves the goal is to put a very strong, thick epoxy between...

I have a fragile plastic piece and I would like to coat the inner walls with carbon fiber, so I was thinking I could lay carbon fiber on it and put some glue from the hardware store to mix with it. Would it work in making it stronger or do I need a special glue?

Is there any material/s that will handle CVI furnace temperatures (1250 C) and will either repel carbon deposits or react with it to create a compound that is not electric conductive? Trying to contain power to the heating element without shorting it to the base/ground through heating element...

I'm trying to find the Yield strength, that is how much force can be applied to carbon nanotubes so that they stretch to the limit before plastic deformation. And also how much they stretch at this limit. Do they stretch at all? Or are they always the same length until the Ultimate Tensile...

Homework Statement What is the maximum number of covalent bonds formed by carbon with nitrogen? A)2 B)3 C)4 D)1 Homework EquationsThe Attempt at a Solution I have not come across a single compound which has more than 3 C-N bonds. But my book is giving the answer as 4. Now, I am not sure...

Would it be feasible to synthesize carbon nanotubes from a carbon gas source that had passed through a man crafted nanopores (nanoholes, nanochannels), the outflowing end of which is covered with a catalyst? This artificial membrane would separate gas source chamber from a product chamber...

https://phys.org/news/2018-12-life-deep-earth-totals-billion.html This report from DCO is a kind of review article. This article itself does not have specific reference papers cited. Just another review article. I think the DCO people expect us to dig around a little. Plus there are ~300 DCO...

Homework Statement Compare Dipole moment of CH3F and and CD3F where D is deuterium. Homework Equations Theory questions The Attempt at a Solution Our sir had explained that to do this question we muat take into account the vibration of the atom in the respective molecule. That is that the...

Hi everyone The following graph shows levels of CO2 in the oceans increasing with atmospheric CO2. https://ocean.si.edu/conservation/acidification/ocean-acidification-graph Given that global temperatures should rise with CO2, is it theoretically possible for the oceans warm to the point...

Are carbon nanotubes a viable substitute for wires in computer chips, which might be a solution for the heating problem?

What are the differences between carbon dioxide solubility (miscibility, reaction) in liquid water when in gaseous (<38 bar) and liquid (>38 bar) phase? The temperature in my experiments is usually between 0 and 5°C. The stirring speed is around 500 rpm. Is the solubility given apart from...

NASA is looking for a process to use CO2 as a Carbon source on Mars; ultimate goal is to use the Carbon in the synthesis of other products. $50,000 prize. Open to U.S. citizens, permanent residents, and U.S. business entities, work must be done in the U.S...

When I read about carbon sinks and the production of CO2, I am puzzled by the trust we have in carbon dating. If I understand correctly, C14 is produced by cosmic rays and nitrogen and is considered a very steady process thus carbon dating is trusted. But if C14 is brought into biological...

*SORRY FOR BAD DIAGRAM* Is this correct for C(triple bond)O ie Carbon Monoxide This is for CO2. Please check both. ALso check everything ie hybridized orbitals, bondings etc. I'm trying to clear concepts. (Note: red= unhybridized, black= hybridized) Thank you.

Homework Statement We want to image carbon C14 atoms using NMR with magnetic field of B=3 T. What frequency do we need to use? Use the following facts: C14 has 0% abundance, nuclear spin of I=3 and g=0.273 Homework Equations The frequency is given by f= (2⋅I) ⋅ (g ⋅B ⋅μ)/(1836 ⋅h), where μ...

Homework Statement [/B] (a) What percentage of carbon produces the strongest plain carbon steel? The Attempt at a Solution I've been posed with the above question and it has lead to some confusion. What is meant by 'strongest'. The question seems to leave open to interpretation what the...

Homework Statement [/B] (a) How are the following properties of Iron affected when carbon is alloyed with it?Illustrate your answer with reference to the microstructures of steel. o Hardness o Strength o Ductility The Attempt at a Solution I've looked at this question a few times and...

Hi everyone! I'm trying to solve the following problem: given the charge densities of carbon nanotubes and graphene, the charge density difference of 2 systems must be found. So I need to unfold in some way the nanotube and compare it charge density with the graphene's one. But how this...

This article describes how total carbon in organisms is distributed among different groups. Science news article here. Original PNAS article here. Plants win, not surprisingly (primary producers). Bacteria are next (Archaea which are similar to bacteria in many ways have much less carbon)...

I don't understand the difference between cast iron and high carbon steel. They both are an iron-carbon alloy and they both have a high amount of carbon within the iron metal. Both will oxidize at the same rate without a coating to protect the metal. Stainless steel will oxidize, it just takes...

I just read an article about the hazards of the keyless feature on new cars (https://www.nytimes.com/2018/05/13/business/deadly-convenience-keyless-cars-and-their-carbon-monoxide-toll.html). Apparently, it can be easy to not know a car is still running in the garage even though one might think...

About possibly using peridotite to capture large amounts of CO2 out of the air. Nice pictures, very little chemistry. NY Times story here.

Homework Statement Homework EquationsThe Attempt at a Solution C=C double bonds means that it is not an Alkane because an Alkane is saturated hydrocarbon. So the answer should be from A, B or C.

Hello everyone, nice to be here. I am going to calculate the young modulus of 3 layers of carbon fiber laminar composite For example: 1st: 12K plain wave carbon fiber in 0 degree 2nd:3K till wave carbon fiber in 45deg 3rd:12K plain wave carbon fiber in 0 degree How can I approach to calculate...

Hello everyone! We're getting prepared to an electromobile car efficiency challange as a team. I'm going to take place in the chassis and exterior design team. I have lots of question but today I'm going to ask one of them. How much does it cost us to produce an ordinary car chassis? I'm...

How strong a long chain of carbon carbon double bonds will be compared to nano tubes? H>c=c=c=c=c=c=c=c=...=c=c=c=c=c=c=c=c=c=c=c=c<H

Hi in every theoretical explanation of any kind of DC motor there's always a split ring commutator and two brushes like in the following pic then when it comes to my motorbike/car starter motor rebuild the real thing in practice is different- see the following pic with four carbon brushes- two...

As I understand it, carbon composites are some combo of polymers and resins, which are derived from oil(black goo from the ground) as the main raw resource. However, as this is carbon, couldn't such materials be produced also from other sources, like corpses, plants, etc? I mean, carbon is...

Alright, a very simple question here. I am reading about nuclear decay of Carbon 14 into Nitrogen 14. I understand how one electron is released and subsequently one neutron turns into a proton, but I am curious about how many electrons are left with the Nitrogen atom. I want to believe five, as...

Hello Friends! Smoker inhales Carbon monoxide and it is thousand times more reactive than Oxygen due to its triple bond formation with haemoglobin which is a protein molecule having iron at centre. Normally in inhaling of oxygen haemoglobin becomes oxyhomoglobin(single bond) and carries fresh...

Hi all, my question is if i have a length of carbon fibre tube, one is round the other is oval and orientated along its longest side is it more stiff than the round one? Reason for asking is i am trying to make a telescopic carbon fibre pole that is more rigid than the round ones on the market...

I'm going to pick on Germany a bit here, based on something I recently learned in the solar power thread: About 9% of Germany's power is produced by wood biomass burning, second only to wind in their "renewable" sector. Clearly, wood can be "renewable", but to me the more important question is...

I have recently seen a paper ( https://www.nature.com/articles/nenergy201787 ) that describes a method to break down carbon dioxide into carbon monoxide and oxygen. I would love to know how they were able to come up with a method such as this but unfortunately I didn't take chemistry in high...

Not just for carbon fiber vs steel, I went to a seminar and heard that the team was researching how to make the steel sheets used for car making to be 'stronger', so that, a car can be safer using their material. Then, when I asked what does it actually mean when they say their improved steel...

Hey there, my honours year thesis is on the design and analysis of a carbon fibre wheel for a Formula Student racecar. However, I am unable to obtain carbon fibre material properties to input into the Engineering Data section. I am required to specify the Youngs Modulus in the x, y and z...

Dear Experts, I am looking for the variation of magnetic permeability of the plain carbon steel wire grade 1000 to 1095 with respect to the ambient temperature ranging from -40 deg C to 200 deg C. Any leads will be appreciated. Thank you!

Can carbon nanotubes support electron propagation perpendicular to the axis? That is, can there be circular current flow on the tube's perimeter, not just the linear flow parallel to the axis? Because I reading that it's generally considered a 1-dimensional conductor.

Dear all I want to loading about 14 ton of CMS (Carbon Molecular Sieve) into a PSA Nitrogen Producer tank. The tank is 5 meter tall with 2 m in diameter. What is the best, simplest and fastest method to load the pellet of CMS into that big tank? I consider this mortar screw pump and connect it...

A tree seed takes water and minerals(?) from the ground, carbon and oxygen(?) from the air, and heat and light(?) from the sun. When a tree dies and dries up, it can be used as firewood, a source of energy. Is there a way to capture that energy without the seed-tree scenario? i.e., but can we...

Homework Statement Carbon-14 decays by β emission and has a half-life of 5570 years. What is the decay constant of carbon-14? What is the activity of 1 g of carbon if 1 in 1012 atoms are carbon-14? After what time will the activity per gram have fallen to 3 Bq? Homework Equations λt½ = ln(2)...

I've been studying how hybridisation works, and in very single example I've come across, there is always Carbon as the atom that undergoes hybridisation. But this can't be right, can it? I mean, Nitrogen can form triple bonds, Oxygen can form double bonds, etc. I'd assume then that Nitrogen...

Why is it that newer organic matter has more carbon-14 than older organic matter? Isn't carbon constantly recycled, because of the carbon cycle? So C14-depleted carbon from old matter would enter the atmosphere, then be breathed in by new organic matter. The new matter would start off with...

what is the basicity of carbon: primary, secondary, tertiary, e.g. in 1-adamantylamine (C connected with N is connected also with 3 other C, 2-adamantylamine (with two other C), 1-adamantymmethylamine (with just one next carbon)? more carbons connected to this first carbon: ...-C-NH2 makes it...

Hi, all graduates and experts here. Being a civil engineer, I was about to create the plan for my new home in Ontario. When I consulted with my fellow engineers, they suggested having carbon monoxide detectors, inside my house as a part of increasing the security. I have already decided to place...

A popular video I just watched described Fred Hoyle's discovery that the elements of the universe are created in stars. Key to his theorizing was the prediction that fusion would produce of a new state of carbon that had never been observed and which theory predicted would be unstable. Hoyle...

How readily does carbon 14 volatilize from (meta)stable forms of elemental carbon? Both graphite and diamond burn in hot air but are very stable in contact with cold air. Carbon 14 has maximum decay energy of 159 keV. At that energy, the electrons are stopped by 20 cm of air, or about 0,2 mm of...