Carbon Definition and 522 Threads

Homework Statement Suppose ##10^{14} kg## of carbon dioxide was released into the atmosphere and absorbed completely, what is the percentage change of carbon dioxide concentration? Take initial atmospheric mass mixing ratio to be ## 5.7 \times 10^{-4} kg/kg##. Homework EquationsThe Attempt at...

i have built a pipe rack made out of carbon steel and needing to know how to figure out how much weight it will carry. the longest horizontal piece is 4" sch 40 x 60 inches long welded to 8" sch 40 carbon steel. just trying to see if there is a chart of some sort

I was studying about dry cell and read that carbon(graphite) rod surrounded by MnO2 is used as cathode but when i read the chemical reaction equation at cathode given as : MnO2 + NH4+ + e - - - - > MnO(OH) +NH3 I nowhere found carbon... So where is it actually used? (i found this for mercury...

Mass of helium-4 (4.0015 u) plus mass of beryllium-8 (8.0053 u) gives 12.0068 u, which is 6.35 MeV above fundamental level of carbon-12. For triple alpha process T= 100 MK, which corresponds to a kinetic energy of 2 x 3/2 kBT = 0.03 MeV for the particles. This amounts to 6.38 MeV, way below 7.65...

hi everyone I found out that graphite carbon conduct just in one side if there is anyone who can inform me how is the structure of this material?

Hi there! Is there an online, hopefully free resource (preferably textbook) that details the process of molecular modeling? Specifically, computationally performing geometry optimizations, vibrational analyses, calculating Raman spectra, detailing the theory behind Hartree-Fock, DFT, post-HF...

Hello to everyone. I would like to ask a question: I'm analyzing the properties of CO2 for a project and I have noticed that for temperatures between 220 -300 K the Clasius Clapeyron curve is linear on 1/T, that is in the Antoine equation of the form logP = A-B/(T+C), C is almost 0. In my...

Assuming that a carbon neutral fuel for cars has to be used, what would be most practical and efficient? (Assumption: there is electricity from hydropower/nuclear or possibility to grow plants for biofuels) 1) Hydrogen from water hydrolysis? (If I get it right, production is simple but the...

Hi, I was tasked to design a composite material that will undergo a 3 point bending test. Maximum deflection will be of 15mm and a maximum load of 5kN. The scope of this task is not to prevent failure but to analyse the composite and learn from the design process. Nonetheless the composite...

Homework Statement A sample containing carbon-14 has 16000 decays per minute. If the half life of carbon-14 is 5730 years. Aproximately how many decays per minute would be occurring after another 50 000 years. Answer: approximately 40 decays per minute. Homework Equations N= No x e^-λt...

why is the molar specific heat of carbon(=6.1JMol-1K-1) so different from the predicted value of 3R≈25??

Hi there, Could someone explain to me why fossil fuels, such as coal and oil, produce fewer particulate matter emissions than natural gas? Also, how would you expect the combustion temperature of these fuels to affect particulate emissions? Would a higher temperature lead to a more complete...

Carbon monoxide can make carboxyhemoglobin in the human body. Do plants have a similar composition? Would smoke from fires and exhaust from fossil fuel engines have an effect on a plants ability to absorb the CO2 or O2 it needs?

I know aqueous Ammonium Bicarbonate forms when NH4+ and HCO3- ions are present in water after they've dissolved from their gaseous states of NH3(g) and CO2(g). This occurs in the reaction: NH3(g) + H2O(l) + CO2(g) => (NH4)HCO3(aq) If Ammonia gas and CO2 are present above a polar organic...

Hi Guys Recently I have started a new hobby into RC planes. What I have noticed is extensive use of Carbon composites weight yet sturdy structures. Now the problem is that these structures seem to be cut (milling/drilling/laser cutting/water jet cutting) from a sheet (or laminates) of carbon...

How does the crystalline structure of silicon make it useful in solar panels? Why is carbon not used?

A proton is traveling to the right at 3.50×107 m/s. It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What is the magnitude of proton speed after the collision? What is the magnitude of carbon atom speed after the...

Homework Statement 200 liters of water are heated from 100 to 650C by burning coal gas. The heat loss in the chimney is 25%. How many cubic meters of gas are needed Homework Equations Calories required: Q=mc\delta t Burning heat of coal gas: 4320[Cal/m3] The Attempt at a Solution Net heat...

I sort of wandered in from the Science Fiction Forum before anyone could stop me. I have a thought that I simply lack the expertise to make use of, and I thought I would drop it in the laps of people who do have the expertise to make use of it. What would be involved to pull carbon directly...

i've been searching for the friction coefficient between medium carbon steels but can't find it, and also i see everywhere the yield stress of materials but i can't find the compressive stress of materials

Life based on carbon needs very especial conditions to thrive, life on Earth is a clear example of that. Lots of time and research have been dedicated trying to find carbon based life elsewhere on the Universe, but that search may be too narrow because that search assumes that life can only be...

I'm in high school and I have a science project, I must test for carbon without testing gas emissions using the following materials. 1.) Take the center carbon rod out of a heavy duty battery and scrape some of the powder off/ or use it directly. 2.) Create a chemical test and/or process...

Hey, So I`ve been trying to wrap my mind on how to solve this problem. I`m trying to use a CFRP Sheet as sort of a spring actuator by using it`s buckling phenomena to deliver a force to the body it`s attached to. Kind of vague so here is a video: This video does it electrically, but I...

Hi all I'm new to this forum, there seem to be quite some knowledge here. I hope someone can help shed some light on this. I took this exam about a week ago and I had no idea on how to solve this question, and I haven't been able to figure this one out since. Homework Statement In a tandem...

Ok what kind of environment do I have to create for the reaction to take place? I'm turning an old propane tank into a reaction chamber and to achieve the temperatures required for reaction I will run a DC current through the material. Will filling the chamber with argon be sufficient or does it...

Hi everyone, I need some specific mechanical properties of A516 carbon steel, but as yet I am unable to find it online. Can you help me find the fatigue limit and the relation between yield strength and temperature? Are there tabulated values for this? Thanks! Mark edit: found it! seems i...

what is the properties of chimcal reaction for carbon and sulfur in gunpowder...and what different reaction happens if the gunpowder have just carbon without sulfur

Is carbon dioxide at relatively the same concentrations in China, America and Antarctica for example? Or (I'm not discussing altitudes) does the concentration of carbon dioxide fluctuate based on where you are on the Earth? Assuming that all measurements are made at the same altitude, would the...

Homework Statement Electrons inside a carbon nanotube can be approximated as a one dimensional "particle in a box". If the nanotube is 3 micrometers long, what is the minimum speed of an electron inside the tube?Homework Equations The Attempt at a Solution The minimum occurs as n=1 so...

How is the carbon in carbon dioxide electrophilic? There is no partial positive charge on the carbon in carbon dioxide because the molecule is symmetrical.

Before I start, I'm not some young Earth believer or anything, just want to understand how it works and if the assumptions are fair. So my understanding of carbon dating is that the ratio of C14 to C 12 is known (About 1 trillion to 1) and it is the same in the atmosphere as it is in organic...

Hi there, Hope you all are doing good. I was reading a book on boilers and burners design and had a problem in understanding some part of the text which I have attached below The problem is I not comprehend that 1. How unburnt carbon mass can be achieved by subtracting CO2 *...

Green Plants do Photosynthesis in day during presence of sunlight and intake C02 to produce O2. In night, Plants do respiration and intake 02 to produce C02. If there will be no animal then Green plants will survive ? Because Earth is like ball, Plants will do photosynthesis=respiration...

which gas has the highest flame temperature .hydrogen or carbon...and why

What color of liquid carbon

Dear Colleagues I want to start some research on the Carbon nano - tubes. In the beginning I need to model a CNT in the ABAQUS. I wrote a code for generating the xyz Coordinates of the atoms in a CNT. The problem is that I can not import them in abaqus. Does anyone has an Idea ? Thanks...

also what is more reactive sulfur or nitrogen. ...

Confused -- nucleosynthesis of carbon May I ask a question please! I read that nucleosynthesis of carbon was rapid because its one of the excited state energies was only a little higher than the total energy of Be and He. So, the required energy could be obtained through the kinetic energy of...

Hi! I would like to know two things: 1. Is it possible to use radiometric dating on samples of rocks collected from Mars? 2. If so, in which situations would such method be impossible to use or would wield inaccurate results? Thanks a lot for your help!

can anyone please give me the answer for addition of carbon to cast iron beyond 6.67%..

What would be a good Internet link that would properly explain Fermi Energy or (Fermi Level)? How does the Fermi Energy of a material vary with external influence, such as doping of the material, and applied electric and magnetic fields for instance? What other factors can effect Fermi Energy...

Hi, I hope this question is appropriate for this forum - if not can anyone suggest a place to ask it? There is a lot of carbon based matter around, on an in the earth. But,as I understand it, other than gaseous forms all the other liquid and solid forms have been generated/created by living...

Wouldn't have to be long ones. Cheap and cheerful amounts. A google search brought up one called cheaptubes.com, anyone had experience with them?

We briefly got an intro to carbon nanotubes in our nanomaterials class, and the professor only briefly introduced carbon nanotubes and the ways to describe the different types of tubes via their indices. Why is it that if the indices of the carbon nanotube have the property such that n-m =...

I was wondering if a quadruple bond between two carbon atoms would be possible. I found this on wikipedia about "dicarbon": http://en.wikipedia.org/wiki/Diatomic_carbon, which is related to this question, since what I'm describing is an isomer of dicarbon. Anyone have any ideas?

Hello, Me and two other people are doing a science research competition for high school students and for our project we thought of a machine that takes in air through a pump and dissolves CO2 and only CO2. The problem is I don't know what to put in for a solution or pure liquid that would...

Homework Statement Question: If petroleum used in transportation were replaced by electricity generated by coal, what would be the percentage change in carbon dioxide output? Refer to the following diagrams for values...

Hello there I've been searching the internet for any information about the total carbon emissions for this year (tonnes/year). However, I've only come across data which is most recently been gather a few years ago (2009 - 2011). However, I'm really curious to what the total emissions are...

The Title pretty much sums it up. http://en.wikipedia.org/wiki/Cyanide Why is it written like that when it is clear that the carbon must be the one with the negative charge?

Hi all, I´m a researcher in computational biology thinking on topics quite far from my field. I want to model long thin-walled tubes of dimensions like those treated here, for example: ≈2 m long, radius ≈50mm and thickness ≈1mm. The tubes I´m interested in should be made of...