1.3. Electrons, energy levels and atomic orbitals
A subsection of Chemistry, 9701, through 1. Atomic structure
Listing 10 of 113 questions
Draw the shape of one of the d orbitals. Complete the following electronic configurations. Ni 1s22s22p63s23p6 Ni3+ 1s22s22p63s23p6 Complete the diagram to show how the presence of ligands around an isolated transition metal ion affects the energy of the dorbitals. energy octahedral complex isolated transition metal ion degenerate d orbitals tetrahedral complex Explain why transition metal complexes are coloured. [Cu(H2O)6]2+ is pale blue but [Cu(NH3)4(H2O)2]2+ is deep purple-blue. Suggest a reason for this. The diagram shows the visible spectrum of a solution of [V(H2O)6]3+. absorption wavelength / nm 350 400 450 500 550 600 650 700 blue green red State and explain what colour the solution is. colour of solution explanation In the presence of chloride ions, [V(H2O)6]3+ reacts to form a mixture of isomeric octahedral complexes. [V(H2O)6]3+ + 2Cl – [V(H2O)4Cl 2]+ + 2H2O Complete the three-dimensional diagrams to show the two isomers of [V(H2O)4Cl 2]+. V isomer 1 V isomer 2 State the type of isomerism shown by isomer 1 and isomer 2 in . The complex [V(H2O)6]3+ also reacts with ethane-1,2-diamine , H2NCH2CH2NH2, to form a mixture of isomeric octahedral complexes. [V(H2O)6]3+ + 3en 3+ + 6H2O Complete the three-dimensional diagrams to show the two isomers of 3+. You may use N N to represent en. V isomer 1 V isomer 2 State the type of isomerism shown by isomer1 and isomer2 in . The reaction of [Ni(H2O)6]2+ with aqueous ammonia produces the complex [Ni(NH3)6]2+. [Ni(H2O)6]2++ 6NH3[Ni(NH3)6]2++ 6H2OWrite the expression for Kstab for [Ni(NH3)6]2+. Kstab = [Ni(H2O)6]2+ also reacts with en to form 2+. The values of the stability constants for the two complexes are shown. Kstab [Ni(NH3)6]2+ = 4.8 × 107 mol–6 dm18 Kstab 2+ = 2.0 × 1018 mol–3 dm9 A solution containing equal numbers of moles of ammonia and en is added to [Ni(H2O)6]2+. State which complex is produced in the larger amount. Explain your answer. Adding a limited amount of en to [Ni(H2O)6]2+ forms the complex [Ni(H2O)22]2+. Suggest the number of possible stereoisomers of [Ni(H2O)22]2+. Explain your answer. You are advised to include three-dimensional diagrams in your answer.
9701_m17_qp_42
THEORY
2017
Paper 4, Variant 2
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Questions Discovered
113