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 Topic  |
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El Dragonatte
Micro Wave
Singapore
103 Posts |
 Posted - 02/22/2003 : 14:05:51
anyone know any chemical reaction that can give off light when heated??
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STAii
X-Ray Wave
Jordan
1376 Posts |
Posted - 02/22/2003 : 16:02:46
EasyMg+O This is a well known reaction that was used in the past instead of a flash for photographing, it needs heat and gives light.
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Phobos
PF Mentor
USA
1417 Posts |
Posted - 02/23/2003 : 14:59:24
I assume you mean visible light, because everything gives off electromagnetic radiation (light) when heated...it's just usually at too low a wavelength to see.--------------------------
In the fabric of space and in the nature of matter, as in a great work of art, there is, written small, the artist’s signature. (from Sagan's "Contact")
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El Dragonatte
Micro Wave
Singapore
103 Posts |
Posted - 03/01/2003 : 13:14:41
what about any chemical reaction that gives of light when an electric current is passed throught it?
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FZ
Gamma Wave
United Kingdom
2222 Posts |
Posted - 03/01/2003 : 14:53:24
Wouldn't it be a physical reaction rather than a chemical one?-------------
"....this will be one battle we will regret. Mark my words..."
FZ 11/14/2002
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carl
Visible Light Wave
Canada
667 Posts |
Posted - 03/03/2003 : 23:39:59
quote:
Originally posted by El Dragonatte:
anyone know any chemical reaction that can give off light when heated??
Those "light sticks" that light up when you break them are probably started off by the friction of the break. I don't know what the chemicals are in them but a break is enough to set them off... and a break usually implies friction ie: heat.
carl
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russ_watters
Radio Wave
USA
53 Posts |
Posted - 03/04/2003 : 03:20:57
I'm not sure if you are wording the question the way you want to - do you mean a chemical reaction that gives off heat and one that produces electricity, or heat (or electricity) applied to a chemical, producing a reaction? When enough heat is applied to ANYTHING it gives off light, regardless of if there is a chemical reaction taking place. And for electricity, your tv (and a flourescent light bulb) is an example of something bombarded with electrons and giving off light. No chemical reactions going on in either though.
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Another God
X-Ray Wave
Australia
1683 Posts |
Posted - 03/04/2003 : 07:03:28
quote:
Originally posted by carl:
Those "light sticks" that light up when you break them are probably started off by the friction of the break. I don't know what the chemicals are in them but a break is enough to set them off... and a break usually implies friction ie: heat.
The light sticks (Glow sticks is what I am thinking of. Flourescent blue, green, red etc?) are a result of a mixture of two chemicals (no idea which), and has nothing to do with friction. The breaking is simply the breaking of a fragile glass tube inside the plastic tube. That allows the two chemicals to mix.
Prove me wrong, I might learn something.
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STAii
X-Ray Wave
Jordan
1376 Posts |
Posted - 03/04/2003 : 08:41:30
quote:
Originally posted by FZ:
Wouldn't it be a physical reaction rather than a chemical one?-------------
"....this will be one battle we will regret. Mark my words..."
FZ 11/14/2002
I agree.
I don't see how electricity will be able to start a chemical reaction directly.
This can be done indirectly (for example: Use an electric circiut to make some heat, so combust a gas, or sth like that)."Don't try to teach colors to a blind person"
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carl
Visible Light Wave
Canada
667 Posts |
Posted - 03/04/2003 : 17:30:16
quote:
Originally posted by Another God:
quote:
Originally posted by carl:
Those "light sticks" that light up when you break them are probably started off by the friction of the break. I don't know what the chemicals are in them but a break is enough to set them off... and a break usually implies friction ie: heat.
The light sticks (Glow sticks is what I am thinking of. Flourescent blue, green, red etc?) are a result of a mixture of two chemicals (no idea which), and has nothing to do with friction. The breaking is simply the breaking of a fragile glass tube inside the plastic tube. That allows the two chemicals to mix.
Prove me wrong, I might learn something.
I thought of that possibility after posting that. Then I got an other example that may fit the description. A regular match is dragged across a rough surface, causing a friction that ignites the chemicals at the end of a stick. The friction here causes enough heat to react with the chemicals at the end of the stick. The result is light, heat and a variety of secondary conveiniences or hazards... depending.
carl
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Chemicalsuperfreak
Infrared Wave
USA
417 Posts |
Posted - 03/06/2003 : 02:06:12
quote:
Originally posted by STAii:
quote:
Originally posted by FZ:
Wouldn't it be a physical reaction rather than a chemical one?-------------
"....this will be one battle we will regret. Mark my words..."
FZ 11/14/2002
I agree.
I don't see how electricity will be able to start a chemical reaction directly.
This can be done indirectly (for example: Use an electric circiut to make some heat, so combust a gas, or sth like that)."Don't try to teach colors to a blind person"
batteries, electroplatting, electrolysis, nerve cells... "mmm, sacralicious"- HJS
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russ_watters
Radio Wave
USA
53 Posts |
Posted - 03/06/2003 : 05:56:22
quote:
batteries, electroplatting, electrolysis, nerve cells...
Those are good examples, but they are examples where the elctricity becomes "free" ie it is released and can be used for other things. In fact, electricity is the driving force behind EVERY chemical reaction since a molecule is nothing more than atoms exchanging/sharing electrons.
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