transition metals Flashcards
(23 cards)
lingand?
A ion or molecule with a lone pair that forms a co-ordinate bond to a transition metal ion
complex ion ?
transition metal surrounded by lingands
when drawing 3d complex ions what should you remember to draw
the lone pair of electrons with the line coming from it
what is the chelate effect ?
when a monodentate ligand is substituted by a bidentate or a multi dentate ligand
why is the following reaction feasible
Cu(NH3)6]2+ + 3H2NNCH2CH2NH2 = [Cu(H2NCH2CH2NH2)3]2+ + 6NH2
4 moles on LHS and 7 moles on RHS
so entropy increases
delta H is almost 0
6 Cu-N bonds r broken
6 Cu-N bonds r formed
delta G is negative
coordination number ?
number of coordinate bond in the complex
when would the shape be square planar ?
when the transition metal is platinum
why can’t a cl- ligand form an octahedral shape
cl - is too big
in octahedral complexes , how would you know if its a cis isomer ?
if 2 ligands are arranged next to each other , then its cis
in octahedral complexes , how would you know if its a trans isomer ?
if the 2 ligands are opposite to each other , then its trans
if something appears RED , what does it mean in reference to light
-Large difference is energy between ground + excited state of orbitals
-high energy blue light is absorbed
-low energy red light is transmitted
equation for energy ?
E = h x f
(h- planck constant)
(f-frequency)
suggest why ions from the s block elements do not usually act as catalysts
only exits as one oxidation state
heterogeneous catalyst
where the catalyst is in a different phase to the reactants
catalyst provides alt route, lowers Ea , w/o being used up
how to make catalyst efficient as possible
increase the surface area
spread the catalyst over inert support medium
s2o82- + 2I- = 2SO42- +I2
Whats the two step reaction w Fe2+
step 1 - S2O82- + 2FE2+ = 2SO42- + 2Fe3+
step 2 - 2I- + 2fe3+ = I2 + 2Fe2+
what goes from green to brown
Fe2+ —-> Fe3+
what goes from purple to colourless
MnO4- ——–> Mn2+
what goes from orange to green
Cr2O72- ——> Cr3+
equation for reaction between purple manganate ions + ethanediote?
16H+ + 2MnO4- + 5C2O42- ——> 2Mn2+ + 8H2O + 10CO2
equation for reaction between phosphorus (v) oxide and water
P4O10 + 6H2O —> 4H3PO4
sulfur dioxide oxidised to sulfur trioxide
V2O5 + SO2 —> SO3 + V2O4
transition metal ?
one that forms at least one stable ion w a partially filled d subshell
