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Chemistry LibreTexts

Mock Sun

  • Page ID
    3015
  • Chemical Concept Demonstrated

    • Chemistry of phosphorus

    Demonstration

    A flask is filled with O2, and phosphorus is ignited and immersed in the flask (picture #2). phos.gif

    Observations

    The phosphorus lights up brightly.  As the flask fills with smoke, the entire flask gives off a uniform glow.

    Explanation

    Phosphorus reacts with oxygen in an exothermic reaction:

    P4 (s) + O2 (g) --> P4O10 (s)

    This reaction produces so much light that it is nicknamed the "Mock Sun."

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