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

  1. May 23, 2013 #1
    Why a silica powder is melting but not burnt when heated?

    Thank you
     
  2. jcsd
  3. May 23, 2013 #2

    mfb

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    Silica (silicon dioxide) is "burnt" silicon. You cannot burn it for the same reason you cannot burn carbon dioxide.
     
  4. May 23, 2013 #3
    What I meant as a burnt is such as the below image:

    burnt bread
     
  5. May 23, 2013 #4

    mfb

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    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.
     
  6. May 23, 2013 #5

    Borek

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    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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