D block 0.0 / 5 ? ChemistryTransition metalsA2/A-levelWJEC Created by: sophiaCreated on: 19-04-17 16:15 define d-block the group of elements whose outer electrons are found in d orbitals 1 of 33 what is a transition element a metal that has a partially filled d sub shell 2 of 33 Oxidation states for Cr +1,+2,+3,+4,+5,+6 (+3 and +6) are most stable 3 of 33 oxidation state of Mn +1+2+3+4+5+6+7 (+2+3+4+6+7 are most stable) 4 of 33 oxidation states of Fe +1+2+3+4+5+6 (+2 and +3 are the most stable) 5 of 33 oxidation states of Co +1+2+3+4+5 (+2 and +3 are the most stable) 6 of 33 oxidation states of Cu +1+2+3 (+1 and +2 are the most stable) 7 of 33 Why do can transition metals have several oxidation states as the 4s and 3d orbitals have very similar energy 8 of 33 What does the preferred transition state depend on? the oxidising power of other atoms in the compound 9 of 33 properties due to an incomplete d sub shell 1) form coloured ions 2)form complexes 3)they have variable oxidation states 4)show alot of catalytic properties 10 of 33 How does Ni show catalytic properties margarine production 11 of 33 how does V2O5 show catalytic properties making so3 for h2so4 12 of 33 how does Fe show catalytic properties harber process 13 of 33 how does Pt, Pd show catalytic properties catalytic converter 14 of 33 what is a ligand a metal/ion with a lone pair of electrons that can form co-ordinate bonds 15 of 33 what is a complex a metal ion with ligands co-ordinatly bonded to it 16 of 33 What colour is: [Fe(H2O)6]2+ pale green 17 of 33 what colour is [Fe(H2O)6]3+ yellow 18 of 33 what colour is [Cu(H2O)6]2+ blue 19 of 33 what colour is [Cr(H2O)6]3+ dark green 20 of 33 what colour is [Co(H2O)6]2+ pink 21 of 33 what colour is [CuCl4]2- yellow or green 22 of 33 what colour is [CoCl4]2- blue 23 of 33 How do the complexes make a colour the 3d orbital splits into 2 the colour seen is what is left after the colours are absorbed by the metal to excite the electrons. 24 of 33 factors effecting the colour 1)size of the energy gap2) the metal3)type of ligand 4)oxidation state 5)co-ordination number 25 of 33 What colour is Cr3+ and what happends when excess NH3 is added Cr3+ is a green blue colour, firstly Cr(OH)3(H2O)3 (green) is formed then [Cr(NH3)6]3+ (deep violet solution) is made 26 of 33 What colour is Fe2+ and what happends if you add excess NaOH Fe2+ is pale green, it will make Fe(OH)2(H2O)4 (dirty green) which will then dissolve to make [Fe(OH)6]4- (blue green solution) 27 of 33 what colour is Fe3+ and what will happen if you add excess NH3 Fe3+ is yellow, and it will make Fe(OH)3(H2O)4 which is rusty brown 28 of 33 What colour is Cu2+ and what happends when you add excess NaOH Cu2+ is blue, it will make cu(OH)2(H2O)4 which is bluish white 29 of 33 what happends when you add excess NaOH to Cr3+ It makes Cr(OH)3(H2O)3 which is a green ppt, then it will make [Cr(OH)6]3- which is a green solution 30 of 33 what happends if you add excess NH3 to Fe2+ It makes Fe(OH)2(H2O)4 which is a dirty green ppt, then Fe(OH)3(H2O)3 is made which is a rusty brown ppt 31 of 33 what happend if you add excess NaOH to Fe3+ It makes Fe(OH)3(H2O)3 which is rusty brown 32 of 33 what happends when you add excess NH3 to Cu2+ It makes Cu(OH)2(H2O)4 which is a bluish white ppt then it makes [Cu(NH3)4(H2O)2]2+ which is a royal blue solution 33 of 33
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