Glass turns black over a candle. Does a chem/phys change , neither, or both happen to the wax, wick, and glass?

Please explain each answer. ...

Please explain each answer.

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3 Responses to “Glass turns black over a candle. Does a chem/phys change , neither, or both happen to the wax, wick, and glass?”

1. let's all point fingers says:

   January 5, 2010 at 12:15 pm

   Ronin is correct but what happens to the glass is a physical change
2. Ronin says:

   January 5, 2010 at 12:15 pm

   The wax melts – physical reaction
   The wick burns – chemical reaction
   the glass heats up and the soot sticks to it, but no reaction occurs
3. flamaurus says:

   January 5, 2010 at 12:15 pm

   soot from the candle is released by the candle and collects on the glass (physical). The wax ignites in the candle and releases this soot (chemical) :]