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Author Topic: what the reasons that makes element flammable ?  (Read 7710 times)

Offline taregg

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what the reasons that makes element flammable ?
« on: 23/10/2011 21:31:30 »
example like hydrogen or carbon or phosphorous  ..explain from the same properties of the atom .


 

Offline taregg

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what the reasons that makes element flammable ?
« Reply #1 on: 26/10/2011 11:56:03 »
please some body answer my question
 

Offline Supercryptid

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what the reasons that makes element flammable ?
« Reply #2 on: 26/10/2011 16:24:23 »
It's because those particular elements are able to enter a lower energy state when combined with an oxidizer such as oxygen. The bonds they form with oxygen atoms are strong and therefore liberate large amounts of energy when they form.
 

Offline CliffordK

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what the reasons that makes element flammable ?
« Reply #3 on: 27/10/2011 00:28:07 »
LEO GER!!!!!!!!!!!!!

Oh, yes,

That is the only thing I can remember from Chemistry.

Loss of Electrons is Oxidization.
Gain of Electrons is Reduction.

So, Oxygen tends to like to gain two electrons to fill its outer electron shell.
And, it tends to bond to anything that will give up its electrons to empty an electron shell.
 

Offline taregg

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what the reasons that makes element flammable ?
« Reply #4 on: 27/10/2011 09:43:05 »
i am talking a bout flammable not oxidization .... The same atom not componds .like H or P or C why does the element produce flame
« Last Edit: 27/10/2011 10:08:08 by taregg »
 

Offline Bored chemist

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what the reasons that makes element flammable ?
« Reply #5 on: 27/10/2011 22:04:56 »
I can't think of any sort of burning that is not an oxidation so I don't understand what you mean by "i am talking a bout flammable not oxidization"


What actually makes things flammable is a complicated  set of properties. Obvious ones include low bond strengths in the material and atomic orbitals that allow large overlap integrals with elements such as oxygen and fluorine.
 

Offline CliffordK

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what the reasons that makes element flammable ?
« Reply #6 on: 28/10/2011 00:21:12 »
There is oxidation without flames, at least under ordinary conditions, although it also depends on the material.  For example, iron tends to rust.

Wood apparently undergoes vaporization, and most of the oxidation is occurring in the vapor phase.  It also releases a product that is a vapor.

Aluminum powder will also burn given the right conditions yielding solid aluminum oxides.
 

Offline Nizzle

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what the reasons that makes element flammable ?
« Reply #7 on: 04/11/2011 10:34:28 »
First you have to ask yourself: What are flames?

They are a combination of electromagnetic energy waves manifesting in the visible light spectrum (since we can see them) and IR spectrum (since we can feel the heat), and burnt up particles (more precisely, oxidized) that are the result of a chemical exothermic reaction.

Simple example with burning H2-gas:
2H2 + O2 → 2H2O + Energy

So the "smoke" you see will be water vapor in this case (H2O), and the light and heat of the flames you see will be Energy

Now, any element that burns (reacts with oxygen) and gives off Energy in the same way as H2 (heat and light) is called 'flammable'.
Elements that are 'non-flammable' either do not react with oxygen or do so in a very mild way so that the Energy released in the reaction is not that big, or does not manifest as a combination of light and heat.

« Last Edit: 04/11/2011 10:38:09 by Nizzle »
 

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what the reasons that makes element flammable ?
« Reply #7 on: 04/11/2011 10:34:28 »

 

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