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Metal oxides displacement reaction

  1. Feb 20, 2012 #1
    When a more reactive metal displaces a solid metal oxide, a lot if heat is required for the reaction to occur. However, both metal and metal oxide can be solid for the reaction to take place right?
  2. jcsd
  3. Feb 21, 2012 #2


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    Staff: Mentor

    Re: matal oxides displacement reaction

    A lot of heat is required for the reaction to start, later on reaction is exothermic.

    Yes, they start as powdered solids. Go to youtube and search for thermite videos.
  4. Jun 14, 2012 #3


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    Not all thermodynamically favorable reactions of the type (unbalanced) M + NO = N + MO are exothermic. For example, the reaction of zirconium with alumina:
    1.5 Zr + Al2O3 = 1.5 ZrO2 + Al
    has a standard gibbs free energy change of -17.8 kJ/mol at 1000C, though its standard enthalpy change is +47 kJ/mol.
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