Transition Metals

• How do transition elements compare to group 1 elements in terms of hardness and strength?


  Transition elements are harder and stronger.
• What is a notable exception regarding the melting points of transition elements?


  Mercury has a lower melting point compared to other transition elements.
• Why are transition elements considered less reactive than group 1 elements?


  They are much less reactive and do not react as vigorously with oxygen or water.
• What are the colors of compounds formed by transition metals with a +2 charge?


  They typically form compounds that are coloured.
• What are the uses of transition metals as catalysts?


  • Decomposition of hydrogen peroxide: 2 H2O2 --> 2H2O + O2
  • Haber process: N2 + 3H2 --> 2NH3 (reversible)
  • Manufacture of margarine: adding H2 to double bonds
• What is the reaction for the decomposition of hydrogen peroxide using transition metals?


  2H2O2 --> 2H2O + O2
• What is the reaction for the Haber process involving transition metals?


  N2 + 3H2 --> 2NH3 (reversible)
• How do transition metals contribute to the manufacture of margarine?


  They are used to add H2 to double bonds.