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Transition Metals

TM

QuestionAnswer
Properties of TM coloured compounds formation of complexes variable oxidation states
Ligand atom/ion with lone pair of eletrons that forms a co ordinate bond to the metal
Complex metal ions with ligands co ordinately bonded to it
Co ordination number number of co ordination bonds from ligand(s) to metal ion(s)
Unidentate ligand forms one co ordinate bond
Bidentate ligand forms two co ordinate bonds
Multidentate ligand forms several co ordinate bonds
Why do the transition metals make good catalysts? Change oxidation state Good surface area for adsorption Transfer electrons to speed up reaction
Ni margarine production, hydrogenation lower temperature and pressure
V2O5 produce SO3 in the contact processes required to make sulphuric acid
Fe harbor process increase rate of reaction decrease temperature
Pt/Pd catalytic convertors
Mn decomposition of H2O2
What are the coloured compounds affected by? Metal Oxidation State Ligands Co ordination number (Size of the energy gap between d orbitals)
What ligands are required for optical isomerism 3 bidentate 2 bidentate/ 2 single 1 hexdentate
What are the properties of optical isomerism? Cannot superimpose rotates light clockwise other rotates light anticlockwise
What are the shapes of molecules and their bond angles? Linear-180 Tetrahedral-104.5 Square planar-90 Octahedral-90
[Pt(NH3)2Cl2] cis-platin anti cancer drug
[Ag(NH3)2]+ Tollens reagent to distinguish aldehydes and ketones
[Ag(CN)2]- silver electroplating
[Ag(S2O3)2]3- formed in photography unreacted AgX in the film
Precipitation soluble ions in seperate compounds are mixed together to produce an insoluble compound
What do the TM react with? NaOH(aq)
Cu2+ pale blue solution blue precipitate
Co2+ pale pink solution blue precipitate pink on standing
Fe2+ pale green solution green precipitate rusty brown on standing brown on standing
Fe3+ pale yellow solution rusty brown precipitate
Why do TM form coloured compounds white light is passed through and some wavelengths are absorbed, those not absorbed are colours shown
d block element where the d sub shell is the highest energy sub shell
transition element at least one ion has a partially filled sub shell
ligand subsitution a substitution reaction where a ligand in a complex is replaced by another ligand
Created by: 07blandforderin