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