Carbon Definition and 521 Threads

I was watching the following TED Talks video about using carbon nanotubes to build a space elevator: After the 12-13 minute point the speaker starts describing how very short carbon nanotubes can be pulled from a "nanotube forest" and spun together to create a very long thread. However the...

Hi I have a simple question about global warming. The percentage of carbon dioxide in the Earth atmosphere is about 0.04% . My question is how is such a small percentage of this gas able to have such a powerful affect on global warming? Thanks

i.If all the calcium carbonate used in set up X was used up for the reaction, what is the amount of moles of carbon dioxide produced during the reaction ? (Ca = 40, C = 12, O = 16) My progress: Molar mass of CaCO3=(40+12+(16*3))gmol-1=100 gmol-1 Molar mass of CO2=12 + 16* 2 gmol-1=44 gmol-1...

Hello All, I am curious to know about the situation of carbon nanotube (single or multi-walled), graphene production/manufacturing companies. Is it a good business ? I mean, manufacturing & selling CNTs and graphenes are profitable business? Thank you for your input. Rajini.

Does anyone here have any analytical experience with dissolved gas, particularly CO2? When CO2 is dissolved in water there can be several reactions: What I would ideally like to do is dissolve CO2 into water and then by some means of analysis, see how much of each species there is in the...

Is it feasible to turn the abundance of carbon in the atmosphere into graphene, given it is an allotrope of carbon and would it be worth the trouble?

I am no chemist but i found this article interesting, is it viable and suited to mass production https://www.sciencedaily.com/releases/2016/08/160825113217.htm Date: August 25, 2016 Source: University of Toronto Summary: Every year, humans advance climate change and global warming by injecting...

I have an aerosol based 'oven, and chimney cleaning' product. Here are the contents: Aqua Propylene Glycol Butane Ethanolamine Cocamide DEA Propane Sodium Hydroxide Sodium Laureth Sulfate Xanthan Gum Parfum From the list, it appears that the only active ingredient is Sodium Hydroxide...

How much does a 12in(height) x 40in(length) x 2in(width) rectangular box weigh?

I am just curious where this gas comes from when volcanoes erupt.

Homework Statement Homework Equations no equations required The Attempt at a Solution so here are my answers, i just want to know if they are correct. also, I am really confused about the function of the commutator in the DC motor, the answer i wrote for part b) was based on research off...

I was wondering if I breakdown water with a carbon electrodes, will some methane be formed as well as hydrogen? In addition if methane is formed could other hydrocarbon chains also occur?

Hello! I've just received information that there may be a requirement to cut some carbon fiber fabric on the water jet machine in our lab. The party that wants the cutting done, requires an option that's quicker than using shears to cut it. That's pretty much all the information I have at the...

in steel made with ferrite ( fe with bcc ) , we have tetrahedral and octahedral sites that the carbon can occupy , we know that carbon likes to occupy octahedral sites , but there are two kinds of them . 1 : on face centers , and 2 : on edge centers . does carbon prefer one of them ? or does...

I'have searched a lot but could not find latent heat for any kind of medium carbon steel for latent heat from solid to liquid and from liquid to gas. Also I want to know the corresponding melting point and boiling point for that know of steel. Any link for a table would be greatly appreciated...

My teacher says in picture (1) carbon atom is Asymmetric carbon atom. I don't know why. I know asymmetric carbon atom are those carbon atoms which are bonded with four different groups/atoms by single bonds. But why would we treat a negative sign as a group or atom? And I also want to ask for...

Homework Statement Using the above result, estimate the annual CO2 emission savings (in kg/yr) associated with replacing one 60W incandescent bulb with one 13W fluorescent bulb, in one typical Canadian household. Do this calculation from “first principles” using the following assumptions: (The...

Carbon 14 with half life of 5730 years has been used for many years to determine the age of objects. Recently plutonium 210 with half life of 21 years has been used as an alternative. Why plutonium 210 is more suitable compare to carbon 14?

Hey, here's a quick question: What is the Hamiltonian operator corresponding to a decaying Carbon-14 atom. Any insight is quite appreciated!

Homework Statement What is the importance of CO2 in our environment? Homework Equations None The Attempt at a Solution CO2 can help is keeping the Earth warm.It can be used by the plants to release oxygen during day.It can be used by decomposers.

Homework Statement The Viking landers on Mars measured a seasonal change in surface pressure of 2.5 mb due to the variation in the seasonal extent of the ice caps. Ignoring any elevation variations on the surface of Mars, calculate the difference in the total mass of CO2 in both ice caps...

I am trying to create a conductive Silicon Carbide (SiC) heating element. The US patent 650234 "Process of making carborundum articles", filed in 1899 states essentially that crushed SiC crystals can be be glued together (using diluted glue) then sintered. It states that the addition of 15-20%...

I have a fair understanding of radioactivity and a general grasp of molecular dating, but I was curious as to how radiocarbon in fossil fuels has survived millions of years despite its half life being only 5,750ish years. From what I've seen through minimal research is that most of the C14 in a...

What is the Oxidation Number of Carbon and Nitrogen In this compound (NH4)2C2O4?? i think the oxidation number of carbon is (+4) and Nitrogen is (-4). am i true?? or not? Note:this is not a homework.

Carbon. So is it known what energy levels for electrons in glass atoms are in eV to move to a higher shell level. Glass does not absorb any light, except UV. but what is the eV for the glass electron to get excited and leave the ground state, and move up to shell level 2, or energy band 2. Also...

Is carbon nanotube the only material found that would make a faster and more efficient computer or are there other materials or methods found that would make a faster computer as well? Here is an article on carbon nanotube

Okay so to start, this is just about the most random inapplicable proposal ever, so bear with me. Its just a cool question to consider. So, here goes: What would happen, (again, this is highly theoretical) in the instance that an enormous screen - much like the ones that rests behind most...

Hi, I'm currently doing a PhD about how to use carbon nanotubes as an efficient single photon source. On my spare time I've done a short video to explain it to my familly and friends. I thought you might be interested, so here it is :

Does the gasoline additive can be complete and effective cleaning of carbon? This is the recipe I found on the Internet formula Methanol 60~70% Isopropyl alcohol CK Ethylene glycol monobutyl ether, 10~20% Diacetone alcohol 10~20% If I need to raise the octane number need to add tert-butyl...

Homework Statement Sound waves can be refracted when they travel through balloons filled with different gases. How would the motion of a sound wave be changed if it traveled through a balloon filled with carbon dioxide?BOOK ANSWER "Being more dense than air, the carbon dioxide in the balloon...

https://www.amazon.com/dp/B004Y6V5CI/?tag=pfamazon01-20 I bought the above carbon monoxide detector out of curiosity.. it has over 1,500 positive 5 star reviews. I put it near the exhaust in the mall parking and sit inside for 20 minutes.. but it doesn't seem to detect any carbon monoxide...

I thought it would be an interesting project to build a detector that will measure and log the outdoor atmospheric CO2 levels. These (global average) levels are currently about 400ppm and these (global average) levels vary by a few ppm every year. Looking for a sensor though, I can't seem to...

I wanted to do a science experiment and it is very important that i learn the electrical resistance of carbon dioxide. From what i would guess, this may be wrong, but carbon dioxide and the atmosphere on Earth probably have a similar electric resistance due to the fact carbon dioxide already...

I want to model the diffusion-controlled combustion of a small carbon particle. The system I want to model is similar to this one However, I'm not going to use the stagnant gas film model as shown in the figure, since I lack data for the film thickness, and I want to evaluate the problem...

Hey there. I am making Carbon pellets using polyvinyl alcohol as a binder to help shape the pellets. I would like to measure the pellet's conductivity without being hindered or influence by the conductivity of the PVA. One way to do it is to heat the pellets to 300 degrees and evaporate the PVA...

There is only 0.77% of oxygen in sun And only 0.29% of carbon The question is there is only small amount of o2 but how how sun is surrounded by fire with very less emissions of carbon ( referred to Wikipedia for amount of gas in sun)

Hello, I would like to know that why carbon is used in nano technology to build nano tubes and other? Is there any other metal which is used to construct the devices of nano technology?

Hello, I am a physics major and my friend is on a research vessel in the Arctic and can only operate email from the limited internet access there. I do not know organic chemistry so I was hoping someone could tell me if this was right (it is for homework when she returns; not in relation to her...

Homework Statement Brown coal, energy content 16 MJ/kg, carbon content 65% by weight, burning in a 30% efficient steam power plant. Homework Equations What is the emissions intensity (kg CO2 emitted/kWh delivered) ? Compare this to Hazelwood which is 1.53 tCO2/Mwh 3. The Attempt at a Solution...

Hi, in the sci-fi story I'm writing there is a planet rich of carbon-like element(let's name it X element), that must posses this characteristics: 1 - X element common form is stable(non-radioactive) and it's like graphite - soft and with dark metallic shine. while it's hardest allotropic form...

Homework Statement CH2=CHCHCH3 + X --> CH3CHClCH2CH3 CH3CHClCH2CH3 + KOH(aq) --> Y then what is the structural formula of Y ?? (show clearly where the functional group located)The Attempt at a Solution It is obvious that X is HCl, and Y should be an alcohol but where is the hydroxyl group be...

Dear PF Forum, I have questions about carbon based life and molecule back bone. Is it true that all life on Earth are carbon based? If it is true, why? Is it because carbon is halfway in periodic table? 4 valence? What about Silicon, Tin and Germanium? They have 4 valence, why life is not based...

Hi, What is in general the most cost-effective way of the CCS technologies: Post,pre or oxyfuel combustion?

Why/How does Carbon's 3rd p-orbital contribute to its bond -- sp3 -- if it's vacant?

I performed column cromatography on an oil, and used carbon boiling chips but got some weird IR. I used hexanes and acetone as solvents, I am trying to figure out some of the spikes, soo I am thinking that maybe the boiling stone being carbon could acted as activated carbon and absorbed some...

I noticed that the Co2 is actually decreasing in the Eon time. My guess is lush vegetations or forests began to grow which absorbed the Co2 by photosynthesis? Would anyone give me any clue?

I am trying to figure out the difference between a carbon sink and a carbon reservoir. The definition for a carbon sink from wikipedia is that “carbon sinkis a natural or artificial reservoir that accumulates and stores some carbon-containing chemical compound for an indefinite period. ” And the...

I am trying to figure out the difference between a carbon sink and a carbon reservoir. The definition for a carbon sink from wikipedia is that “carbon sink is a natural or artificial reservoir that accumulates and stores some carbon-containing chemical compound for an indefinite period. ” And...

I'm tying to find any clue about the timescale of the biological pump. That the carbon is recycled to the surface ca. 1,000 years is clear but the timescale of the biological pump seems hard to find. There is an report I saw when I was surfing the internet saying that the timescale can range...

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...