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10 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Transition metals
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a d-block element which forms an ion with an incomplete subshell
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which 2 elements cannot be transition metals and why?
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Sc3+ forms an empty ion 3d subshell and Zn2+ forms a full subshell. which cannot be counted for as it is not incomplete.
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which 2 transition elements do not have their subshells filled out normally and what is the shell configuration?
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Chromium- 4s1 3d5
Copper- 4s1 3d10 |
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why is the 4th subshell emptied out first?
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because it has a higher electron energy than 3d as it has been filled.
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first in first out
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Give 3 physical properties of transition metals
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1) Form coloured compounds
2) Have variable oxidation states 3) Can act as a catalyst |
when solid they are giant ionic lattices
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why do they form coloured compounds?
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certain light wavelengths are absorbed and some parts of the visible light is absorbed. those that are not transition metals will not form coloured compounds as they do not asorb any light.
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state how transition metals can act as a catalyst
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1) provides a surface for the reactants to adsorb onto and then allow products to desorb
2) variable oxidation states are provided binding to reactants by forming intermediates |
there are 2 examples of this
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state the 4 chemical reactions using transition metals + metal and equations
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1)haber process: Iron catalyst
N2 +2H2<---> 2NH3 2)contact process: vanadium oxide 2SO2 + O2<---> 2SO3 3) hydrogenation: Nickel cat c=c + H2 ----> C-C 4) Decomp H202 2H2O2----> 2H20 + O2 |
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state the 4 precipitation reactions of transition metals and their colours
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1)Cu2+--> Cu(Oh)2
pale blue------->pale bluee 2) Co2+--> Co(oh)2 pale pink----> blue prec (beige air) 3) Fe2+--> Fe (Oh)2 green green prec (rusty brown surf in air) 4) Fe3+ --> Fe(Oh)3 yellow---> brown precipitate |
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ligand substitution
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*[cu(h20)6]2+ +6NH3--> [cu(NH3)6] +6H20// Blue solu--light blue prec--deep blue solu
*[cu(h20)6]2+ +4Cl- -->[cucl4]- +6H20//blue solu--green solu--yellow solu tetrahedral shape *[co(h20)6]2+ 4cl--> [cocl4]2- +6h20 // pink solu-- blue solu |
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