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Why A Silica Powder Is Melting But Not Burnt When Heated?

by mymachine
Tags: burnt, heated, melting, powder, silica
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mymachine
#1
May23-13, 12:26 AM
P: 42
Why a silica powder is melting but not burnt when heated?

Thank you
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mfb
#2
May23-13, 06:43 AM
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Silica (silicon dioxide) is "burnt" silicon. You cannot burn it for the same reason you cannot burn carbon dioxide.
mymachine
#3
May23-13, 03:44 PM
P: 42
Quote Quote by mfb View Post
Silica (silicon dioxide) is "burnt" silicon. You cannot burn it for the same reason you cannot burn carbon dioxide.
What I meant as a burnt is such as the below image:

burnt bread

mfb
#4
May23-13, 04:52 PM
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Why A Silica Powder Is Melting But Not Burnt When Heated?

That is probably the result of a reaction between bread and oxygen.
Silica is the result of a reaction between silicon and oxygen. It does not look black, but it is similar to a burnt bread.
Borek
#5
May23-13, 05:12 PM
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P: 23,378
Actually burnt bread is more like effect of the carbohydrates decomposition - water leaves molecules, leaving mostly pure carbon. Silica is not similar to carbohydrates.


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