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Pearson Edexcel IAL Chemistry

Unit 4: Rates, Equilibria and Further Organic Chemistry

Unit 5: Transition Metals and Organic Nitrogen Chemistry

Topic 16: Redox Equilibria

Topic 17: Transition Metals and their Chemistry

17.1—Transition metals are d-block elements that form one or more stable ions with incompletely-filled d-orbitals

17.2—Deduce the electronic configurations of atoms and ions of the d-block elements of Period 4 (Sc-Zn) given their atomic number

17.3—Why transition metals show variable oxidation number

17.4—What is meant by the term ‘ligand’

17.5—Dative (coordinate) covalent bonding is involved in the formation of complex ions

17.6—A complex ion is a central metal ion surrounded by ligands

17.7—Aqueous solutions of transition metal ions are usually coloured

17.8—The colour of aqueous ions, and other complex ions, is a consequence of the splitting of the energy levels of the d-orbitals

17.9—Why there is a lack of colour in some aqueous ions and other complex ions

17.10—The meaning of the term ‘coordination number’

17.11—Colour changes in transition metal ions may arise as a result of changes in: i oxidation number of the ion ii ligand iii

17.12—H2O, OH- and NH3 act as monodentate ligands

17.13—Why complexes with six-fold coordination have an octahedral shape, such as those formed by metal ions with H2O, OH- and NH3

17.14—Transition metal ions may form tetrahedral complexes with relatively large ions such as Cl-

17.15—Square planar complexes are also formed by transition metal ions and that cis-platin is an example of such a complex which

17.16—The terms ‘bidentate’ and ‘hexadentate’ in relation to ligands

17.17—Haemoglobin is an iron(II) complex containing a polydentate ligand and that ligand exchange occurs when an oxygen molecule

17.18—The colours of the oxidation states of vanadium (+5, +4, +3 and +2) in its compounds

17.19—Redox reactions for the interconversion of the oxidation states of vanadium (+5, +4, +3 and +2), in terms of the relevant Eo

17.20—Understand, in terms of the relevant E values, that the dichromate(VI) ion, Cr2O2- i can be reduced to Cr3+ and Cr2+ ions

17.21—Dichromate(VI) ions can be converted into chromate(VI) ions through the equilibrium Cr2O7^2− + H2O ⇌ 2CrO4^2− + 2H+

17.22—Record observations and write suitable equations for the reactions of Cr3+(aq), Mn2+(aq), Fe2+(aq), Fe3+(aq), Co2+(aq)

17.23—Write ionic equations to show the meaning of amphoteric behaviour, deprotonation and ligand exchange in the reactions

17.24—Ligand exchange, and an accompanying colour change, occurs in the formation of: i [Cu(NH3)4(H2O)2]2+ from [Cu(H2O)6]2+ via

17.25—Understand, in terms of the positive increase in ∆Ssystem, that the substitution of a monodentate ligand by a bidentate or

17.26—Transition metals and their compounds can act as heterogeneous and homogeneous catalysts

17.27—A heterogeneous catalyst is in a different phase from the reactants and that the reaction occurs at the surface of

17.28—Understand, in terms of oxidation number, how V2O5 acts as a catalyst in the contact process

17.29—How a catalytic converter decreases carbon monoxide and nitrogen monoxide emissions from internal combustion engines by: i

17.30—A homogeneous catalyst is in the same phase as the reactants and appreciate that the catalysed reaction will proceed via

17.31—The role of Fe2+ ions in catalysing the reaction between I− and S2O8^2− ions

17.32—The role of Mn2+ ions in autocatalysing the reaction between MnO4− and C2O4^2− ions

17.33—CORE PRACTICAL 14 The preparation of a transition metal complex

Topic 18: Organic Chemistry – Arenes

Topic 19: Organic Nitrogen Compounds: Amines, Amides, Amino Acids and Proteins

Topic 20: Organic Synthesis

Unit 6: Practical Skills in Chemistry II

Assessed mathematical skills and measurement conventions

A-Level/Edexcel/Chemistry//A2/Concept/Unit 5: Transition Metals and Organic Nitrogen Chemistry/Topic 17: Transition Metals and their Chemistry/17.16—The terms ‘bidentate’ and ‘hexadentate’ in relation to ligands

Unit 5: Transition Metals and Organic Nitrogen Chemistry A2

Syllabus: 2017
Section: —
Level: A2

Exam analysis

Most tested topics

Topic 16: Redox Equilibria
Topic 17: Transition Metals and their Chemistry
Topic 18: Organic Chemistry – Arenes
Topic 19: Organic Nitrogen Compounds: Amines, Amides, Amino Acids and Proteins
Topic 20: Organic Synthesis