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

[mymachine]

Why a silica powder is melting but not burnt when heated?

Thank you

 

[mfb]

Silica (silicon dioxide) is "burnt" silicon. You cannot burn it for the same reason you cannot burn carbon dioxide.

 

[mymachine]

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]

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]

Actually burnt bread is more like effect of the carbohydrates decomposition - water leaves molecules, leaving mostly pure carbon. Silica is not similar to carbohydrates.