Creative Problem Solving in Chemistry - Cobalt complexes

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Devise structures for cobalt complexes given, decide how to distinguish between the four complexes, and identify some properties or characteristics that are the same for all four complexes.

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Cobalt complexes
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Level

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Specification

Wales
- A/AS level
  - WJEC Chemistry
    - Unit 3: PHYSICAL AND INORGANIC CHEMISTRY
      - 3.4 Chemistry of the d-block transition metals
        (a) how the d-block elements attain various oxidation states in their compounds
        (b) the most important oxidation states of Cr, Mn, Fe, Co and Cu and the colours of aqueous solutions of compounds containing Cr³⁺, CrO₄²⁻, Cr₂O₇²⁻, MnO⁴⁻, Co²⁺, Fe²⁺, Fe³⁺ and Cu²⁺
        (c) bonding in tetrahedral and octahedral complexes
        (d) origin of colour in transition metal complexes, as exemplified by octahedral 6- coordinate species such as [Cu(H₂O)₆]²⁺ and [Fe(H₂O)₆]³⁺, in terms of the splitting of d-orbitals
        (e) idea of ligand exchange and how this can lead to a change in coordination number as exemplified by the reactions of [Cu(H₂O)₆]²⁺ and [Co(H₂O)₆]²⁺ with concentrated HCl
        (f) colours and formulae of the approximately octahedral complex ions [Cu(H₂O)₆]²⁺, [Cu(NH₃)₄(H₂O)₂]²⁺ and [Co(H₂O)₆]²⁺ and the approximately tetrahedral ions [CuCl₄]²⁻ and [CoCl₄]²⁻
England
- A/AS level
Scotland
- Advanced Higher
  - SQA Chemistry
    - Inorganic and Physical Chemistry
      - Transition metals
        Ligands
        Ligands may be negative ions or molecules with non-bonding pairs of electrons which they donate to the central metal atom/ion forming dative covalent bonds.
        Ligands can be classified as monodentate, bidentate up to hexadentate given a formula or structure of the ligand or complex.
        Complexes can be named and formulae written according to IUPAC rules.

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