It is an exothermic process by which a substance is oxidized (by an oxidizing agent such as oxygen) to release a large amount of energy in the form of heat and/or light.

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Is the end of a cigarette on fire when lit?

Is the end of a cigarette on fire when it is lit? Or is it smoldering? Is there a chemical difference between the two?
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C + O2 is equal to C + O, how is that possible

C + O = CO2 . This is because carbon has valency of 4 while oxygen has valency of 2. When they react the valencies are criss crossed which means we will get C2O4 but this is simplified to CO2. But ...
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Incomplete Combustion products

In class we performed an experiment which I am unable to understand the results for Why does the the amount of soot produced vary? What is the amount of soot produced dependent on? ** Experiment: ...
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Role of heat in combustion

What role does heat play in the combustion process.Specifically, does the amount of heat determine whether complete or incomplete combustion occurs, and is the amount of heat impacted by the amount ...
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37 views

Could this be a feasible fuel system?

First off, please forgive me, I am a chemistry novice! Overall Process Fuel for the system is distilled water Split water into Hydrogen and Oxygen (electrolysis or similar process) Exhaust Oxygen ...
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Maximum pressure that can be produced by a combustion reaction

Multiple-chamber artillery can launch a projectile with energies much higher than single-chamber guns. I'm interested in setting a fundamental upper bound on the energy that a chamber (of a known ...
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246 views

Limiting Reactants without a given mass

This is a question I have for Chemistry homework, but I don't understand how to solve it without a given mass. I narrowed the choices down (see below _) I know a limiting reactant well limits the ...
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36 views

What would cause a sudden drop in humidity in my home?

I have a ventless propane heater newly installed in my home, which has been an increasingly source of paranoia for me (constant condensation on the windows, worries about carbon monoxide poisoning). ...
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44 views

What are the known atomic oxygen species?

I'm interested in chemical reaction mechanism with more exotic particles. The Wikipedia page seems to imply that the normal atomic oxygen is $O(^3P)$, is that right? I also came across ...
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Calculating mole percentage of a component of a mixture emitted in complete combustion

In a complete combustion (SATP conditions) of $1.00L$ natural gas, there is an emission of 40 Kilo-Joules of heat. If the gas is a mixture of $CH_4$ gas and $C_2H_6$ gas, what is the mole percentage ...
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147 views

Why does a wood fire create benzene?

According to this article called The Fireplace Delusion a wood-fire will create benzene. This surprised me and I can't find an article online that explains the chemical reaction behind that.
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Characteristics of a methane combustion chamber? (direct injection)

While I've found several combustion chamber descriptions, it's been impossible to find anything about a methane one (direct injection). Could anyone please point me to any article or resource where I ...
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Temperature & time necessary to carbonize all organics

Suppose that I have a cast-iron pot which my awful roommate has vigorously scrubbed with soap and left to soak in soapy water over the weekend. The seasoning has been destroyed and replaced with ...
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Variation of cone angle with concentration of fuel-air mixture

A stoichiometric fuel-air mixture flowing in a Bunsen burner forms a well-defined conical flame. The mixture is then made leaner. For the same flow velocity in the tube, how does the cone angle ...
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Why is O2 the supporter of combustion?

It's there in every high-school textbook: $O_2$ is the supporter of combustion. Without $O_2$ combustion cannot take place. Why? And why only $O_2$? Why not some other element? And, what happens when ...
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Open flame combustion in bizzaro world

Humans typically achieve combustion by starting a chemical reaction of a fuel (often a carbon $C$ containing fluid like methan $CH_4$), which is is brought into an an oxidizer ($O$ containing gas, ...
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Can natural gas appliances run on Hydrogen?

Can natural gas appliances run on Hydrogen? If so, does the appliance have to be modified and how significant of a modification would it need? Thanks
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Are there substances that cannot undergo combustion?

Are there substances that cannot undergo combustion? If so, what are they?
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What determines a substance's energy of activation with air?

Ice will melt when heat is applied; paper will catch fire. In trying to figure out why — what the difference is between things that melt and things that catch — I found "Burn, Char, Melt" by Roberto ...
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Is there a point at which Ethanol (E10) fuel becomes harmful to gas tanks or engines if not used?

This is not the typical chemistry question on this website, but I think it's an important practical question. When I got a gas string trimmer, the woman who worked at the gardening shop told me that ...
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Phenomenon where fumes can relight an extinguished flame

I lit a mosquito coil and used it to melt down small down candle wax which had fallen on the floor. The coil then produced some dense fumes. I directed the fumes to the flame of a candle. As soon the ...
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How does sulfuric acid catalyze the reaction of potassium chlorate and sucrose?

Part of the total reaction is mentioned here: http://chemistry.about.com/od/demonstrationsexperiments/ht/instantfire.htm $\ce{2KClO3(s)} + \text{heat} \rightarrow 2\ce{KCl(s)} + 3\ce{O2(g)}$ The ...
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Enthalpy Calculations, Heat of Formation/Combustion

I just don't understand how to do these and would really appreciate your help. 1) Ammonium dichromate decomposes in a reaction when heated. Calculate the heat transferred for the decomposition of ...
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Is this enthalpy change question possible?

The question states the following equation: $$ \ce{C(s) + 2H2(g) -> CO2(g) + 2H2O}$$ And then asks you to calculate the enthalpy change for it, given enthalpies of combustion. The stated values ...
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What are the major environmental drawbacks with using methane as a combustable fuel?

What are the biggest environmental issues with using methane, $\ce{CH4}$, (which is found as the major energy source in natural gas, shale gas, biogas, and synthetic natural gas), as a combustible ...
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Forms of carbon in incomplete combustion

When hydrocarbons burn with little oxygen, carbon is produced. What form do these particulates of carbon come in? Is it a simple molecule like $S_8$, or a small fragment of a larger structure, like ...
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In practice, how dangerous is liquid oxygen as an oxidizing agent?

The Wikipedia page on liquid oxygen tells us Liquid oxygen is also a very powerful oxidizing agent [...], if soaked in liquid oxygen, some materials such as coal briquettes, carbon black, etc., ...
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In a Koppers-Totzek reactor, why do I get CO and H₂ instead of CO₂ and H₂O?

A Koppers-Totzek reactor (there seems to be only a German Wikipedia page) is an entrained flow gasifier that blows coal dust, oxygen and water (as steam, of course) into a burning chamber where the ...
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190 views

Is combustion considered a redox reaction?

When carbon combusts with oxygen, is this considered a redox reaction since the oxygen atoms gain electrons and the carbon atoms lose them?
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119 views

What are the key chemical characteristics that determine the octane rating of fuel?

The octane rating of petrol (gasoline) is a measure of the how much compression a fuel air mixture can have before detonating (which in petrol engines is a bad thing as you want the mix to combust ...
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165 views

Find mass of CO₂ and heat released per minute in a combustion reaction

I am not sure where to start with this problem. I know that $\small q = mc(T_f-T_i)$, but that seems like it would not help here. I think I need to balance the equation, but I am not sure how the rate ...
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129 views

Is it possible to get energy from frozen methane without oxygen?

In one of the solar system documentaries it was mentioned there are moons in the solar system with lakes of frozen methane. Assuming humans or robots or whatever could make it there, would there be a ...
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392 views

How do I balance this combustion reaction?

I have butene being burned in a fuel rich engine and I can't seem to balance this reaction $C_{4}H_{8}+a(O_{2}+3.76N_{2})->bCO_{2}+cH_{2}O+dC_{4}H_{8}+e(3.76N_{2})$ When I try write equations for ...
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Is ash fireproof?

At high temperatures (almost) everything burns to ash. Is ash 'fireproof'? Is further combustion of ash possible for example by combining with hydrogen, oxygen, etc?
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Temperature of pure oxygen combustion [closed]

I'm wondering what the temperature of pure oxygen being burned is.