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CAIE A Level Chemistry 9701 · Chemistry of transition elements

Chemistry of transition elements: describe question

Describe5 marksStandard

A student prepares a solution containing the complex ion [Fe(CX2OX4)X3]X3−\ce{[Fe(C2O4)3]^{3-}}, formed when ethanedioate ions, CX2OX4X2−\ce{C2O4^{2-}}, coordinate to FeX3+\ce{Fe^{3+}} ions.

Describe this complex ion in terms of:

  • the type of ligand and the type of bond formed between the ligand and the metal ion
  • the coordination number and the geometry of the complex
  • the number of ethanedioate ligands in the complex.
0 words · 5 marks

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How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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