Carbon Definition and 521 Threads

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...

Homework Statement In an engine test the dry exhaust gas analysis is CO2: 5.27%; O2: 13.38%: N2: 81.35%. Assuming that the fuel is a pure hydrocarbon of the form CxHy, and that it is completely burnt, calculate the ratio, by mass, of carbon to hydrogen in the fuel and the air to fuel...

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

Hello, For my University project I am trying to design uprights for a race car. Currently we are using TIG welded 4130, I am trying to push the Titanium carbon direction. I have many questions! The idea of the upright is to use a titanium core (manufacture from laser sintering) then...

1. Homework Statement This was a question on an exam I took a week ago in inorganic chemistry. The problem statement was like: "We have two molecules, H2CCH2 (ethene) and F2CCF2 (1,1,2,2-tetrafluoroethene). Which bond angle is greater? H-C-H in ethene or F-C-F in 1,1,2,2-tetrafluoroethene?"...

i don't understand how an applied Voltage on a (intrinsic) Carbon Nanotube could change its conductance... There is not a population inversion like in mosfet. So, which is the physics? Where this carriers can from? thank you.

I am a lisc. Auto body tech, and I have a customer who wants a Carbon Fiber roof on a Volkwagen bug, I can fabricate a inner frame, and bonding will not be an issue, (according to paint rep) The hard part is I want to do a flush seem and have paint blend into carbon fiber. I will "butt" match...

What is it about the atomic makeup of carbon electrodes that makes them neutral in electrolysis?

Homework Statement Let’s say the % concentrations of CaCO3 (table 5) you obtain from trial #1 and #2 are consistent, while the concentration obtained from trial #3 is significantly higher. Demonstrate, how and where, a wet flask could be involved to explain such a result. Explain in great...

I'm analyzing data taken from 500 MeV/nucleon Iron beam and 290 MeV/nucleon Carbon beam. When looking at the fragmentation that has occured, the fragmentation for the Carbon beam seems almost always be alpha particles (I though I would see some Beryllium as well). Does this mean that the Carbon...

So I am pursuing the production of carbon nanotubes. I have found easy success with arc discharge and something kind of like progress with a CVD rig I have patched together from another design, but I'm all about longer tubes (guess my gender for a gold star). Of course, longer tubes are the main...

why carbon can form polymers and sillicon not? though both are tetra valent. explain this based on its orbital and bonding energies

Aluminium strengthening with carbon?? Hi , Is it possible to strengthen aluminium with interstitial strengthening by carbon?I couldn't find any aluminium alloy with carbon content.What is the problem behind alloying of carbon with aluminium?

I am interested in the use of carbon nanotubes for making transparent conductive films, for example to replace indium tin oxide. When I looked up papers on the subject, I noticed that most of the work to date has used single-walled carbon nanotubes. Initially I was under the impression that...

Hello! How to calculate the hybridisation in carbon compounds? Most of the time whenever i try to find out the hybridisation i get a wrong answer. I think the usual way of finding hybridisation doesn't work with carbon compounds. Is there any other way?

As I understand it, carbon nanotube (CNT) exhibits quantised conductance (2e^2/h) because the mean free path length of carbon nanotubes are often longer than the length of the tubes. If one is to substitutionally dope CNTs (say armchair metallic CNTs) with other atoms of similar size, for...

Homework Statement I have to determine the resistance of a cone shaped resistor with the following dimmensions: Height at the first end: 1mm Lengdt: 250mm Height at the last end: 0.5 mm Rho: 14.5^10-6 Ohm*m Homework Equations \Omega = \frac{\rho \times L}{A} The Attempt at a...

Is there anyway to find out or approximate how much carbon dioxide a person produces per day, how much oxygen does a plant produce per day. And do different species of plants produce different amounts of oxygen?

Homework Statement I'm trying to express the conditions for a zigzag carbon nanotube in a mathematical vector. Homework Equations B = na1 + ma2 The Attempt at a Solution I want to say "either a=0 or b=0", but must I also say that it can't be a=b=0 or is that already excluded in...

We all know that carbon shows the configuration 1s2- 2s2- 2p2 But, since half-filled and fully filled orbitals are more stable, why doesn't it show the configuration 1s2- 2s1- 2p3 ? Why doesn't the 2s orbital give 1 electron to 2p, as in the case of Chromium, where one electron goes from 3d to...

Hello! I was looking at the Water Gas Shift Reaction and I was interested to know why it is exothermic. Since it involves carbon monoxide, I looked at the resonance structures for CO, and found three, see the wiki article here...

We would be working on with Carbon Nanotubes (CNT) for post graduate research. We are doing a thesis on liquid crystals and would be using CNT. Please let us know what what safeguards and precautions have to be taken when working with it in our lab. Search engines have shown sites that say...

Can Carbon displace Aluminium, Silver and Gold from their oxides ? Also where is Carbon found in the reactivity series ? Edit : Got confirmation of Carbon's position in the reactivity series. But I still have a doubt about Silver and Gold because they are unreactive.

What is the carbon content of a good samari sword? A samari sword has a blade of extra hard steel for slicing and a blunt end of a more flexible steel. Maybe some metalurgial technigues to get te raw iron to that carbon content.

Hi. At what temperature range can brittle fracture be expected in low carbon steels? Are there other parameters which govern its occurance? Thanks.

Homework Statement Carbon dioxide partial pressure: a. increases in the blood as it travels from the systemic venules to the inferior vena cava b. is greater in the blood in the systemic capillary beds than in the alveoli of the lungs. The Attempt at a Solution The answer is...

Hello, I have one short question. Can I somehow get the information of the composition of the material (percantage of certain metals inside) if I have these data about it: carbon steel API 5L Grade B Schedule 40? I would appreciate your help veeery much! Regards Amy

How do I find the energy difference between 1s and 2p, in a carbon atom? I'm right in assuming this is a constant value, and yet I cannot find the answer anywhere..? Thanks

Hi! This is my first post on physicsforums. I wasn't sure if it belonged here or in the Chemistry forum, but just picked here. I am trying to figure out if my drinking water filter system removes some fluoride from my water. (I know it doesn't remove all as it's not specifically a fluoride...

desperately need help with the question below. me and my dad have been working on it for hours but keep getting the answer to be 5.97x10^-23?! totally off what it should be. Q. There are about 1.3x10^-12 carbon-14 atoms for each atom of carbon-12 in living materials, and the half-life of...

Homework Statement If carbon dioxide is collected at 104.3 kPa and 29.6 oC, how many grams are collected? Use the gas constant of 0.08206 L. atm/mol . K. 1. Liters at STP. 2. Grams at new temperature and pressure. Homework Equations PV=nRT The Attempt at a Solution I really don't...

Homework Statement half life of carbon 14 is 5730 years. living matter produces 15.3 disintegrations per min per gram of carbon it contains. A 1g sample of a plant from an excavation shows 7 disintegrations per min from carbon-14. how long did the plant die? Homework Equations k = 1/ t...

How can I find the decay rate of carbon? I have found the decay constant and I know the half life and the number of atoms. I think I have the data and I have the answer but I think I am using the wrong equation as my answer does not fit the books. The decay constant I got as -1.209x10^-4...

Is copper absorbs Carbon? I've just seen in one Science Fair project. In that there was one project. it was about pollution. There was a model of sizing machine. The boy who made this project says " If we use Copper in Sizing boilers, Copper will absorb much quantity of Carbon from air". My...

May i know what is the emissivity for carbon steel ? Is it suitable for me if i using IR thermometer(with emissivity 0.95fixed) to measure cutting temperature ?

Hi, for a University project I need to find areas of application for a special carbon fibre composite design process. This process makes it possible to optimize several properties of the carbon composite at once. For example it is possible to develop structures that provide several...

Homework Statement A certain artifact is found to have a carbon-14 activity of 0.12 Bq per gram of carbon. What is the age of the object? Homework Equations A = A(initial) * (1/2)^(t/h) where A = current amount A(initial) = initial amount t = time h = half-life (aka half-time) The Attempt...

1. Burning butane (C4H10) produces gaseous carbon dioxide and water. The enthalpy of combustion of butane is -2650 kJ/mole. Determine how much water you can heat from room temperature (22 Degrees) to boiling with 1 kg of butane. Therefore: 13O2 + 2C4H10 ---Heat---> 8Co2 (g) + 10H2O(l)...

Ok so my problem is I have absolutely no idea where to start. I have been able to figure out other problems but this I can't get my head around. I am unsure as to the equations I need to use for collisions and how to obtain the correct answer. Homework Statement A nuclear reactor (see...

There's this kid mentioned in another thread that seems to raise doubts about carbon nucleosynthesis but the thread was locked, so I thought I'd ask the experts :If all the carbon of the universe is produced in masive stellar fusion nucleosynthesis, is 13 billion years time enough to reach the...

I understand what a carbon nanotube is. I have some experience with geodesic domes and the way those shapes can be changed. I keep hearing more and more about carbon nanofibers but I've never seen it explained. Is a carbon nanofiber a bundle of nanotubes, chains of carbon particles or something...

hi, I've been toying with the idea of converting my mini cooper to an electric car, and I'm brainstorming ways to reduce the weight as much as possible. I came up with the idea of a carbon fiber frame to replace the heavy steel one, I found a company that can do it for me, but I was wondering...

http://news.blogs.cnn.com/2011/03/09/japanese-company-announces-breakthrough-in-carbon-fiber-technology/ Is this really feasible? I was under the impression that mass production of carbon fiber structures like this was still too slow and the fiber too expensive to make? Obviously I'm...

I'm working on a computer model that simulates material damage in fiber reinforced polymers in extreme temperatures. I have looked around to find where I can buy some and get material properties. So far the best place I have found is Rock West Company with their quasi-isotropic lay...

What does that mean. Transfer of 1-carbon unit. What is a 1-carbon unit, are they referring to carbon number 1(according to nomenclature) of the molecule being transferred or a single carbon atom from the molecule is transferred? Can anyone explain. Thanks :smile:

Homework Statement ...Consider a diffuse gas cloud that contains carbon monoxide (CO) molecules... What are the radio wavelengths (in cm) and frequencies (in GHz = gigahertz = 109 Hz) corresponding to transitions between the ground state, the first excited state, and the second excited...