inorganic 2- transition metals Flashcards
what is a transition metal
an atom that forms at least one stable ion with a partially filled d subshell
what are properties of a transition metal
forms complexes, forms coloured ions, variable oxidation states, catalysts
whats a ligand
ion/atom/molecule that has at least one pair it can donate to a central ion
whats a complex ion
a central metal ion surrounded by co ordinately bonded ligands
whats a co ordination number
number of co ordinate bonds formed on a central ion by ligands
whats a mono, bi and multi dentate ligand
mono: one lone pair to donate. bi: 2 lone pairs to donate. multi: more than two lone pairs to donate
what is scandium not a transition metal
its only stable ion (Sc3+) doesnt have a partially filled d subshell (its empty)
why is zinc not a transition metal
its only stable ion (Zn2+) doesnt have a partially filled d subshell (its full)
what are the charges on the three monodentate ligands
H2O=0 NH3=0 Cl=-1
Explain why metal(II) ions do not usually form octahedral complexes when chloride ions are the only ligands
chloride ligands are too large and repel
You are provided with a 1.00 mol dm–3 solution of iron(III) ions and a colorimeter. Outline a plan for experiments using this solution and this apparatus which would enable you to determine the concentration of iron(III) ions in a solution of unknown concentration.
make solution of known concentrations
measure absorbance
plot calibration curve (absorbance v concnetration)
measure absorbance of unknown concentration
compare against calibration curve and determine concentration
write the half equation for H2O2 when its oxidised to oxygen by manganate (VII) ions
H2O2 –> O2 + 2e- +2H+
write the half equation for MnO4- when its reduced by H2O2 to form Mn2+ ions
MnO4- +5e- +8H+ –> Mn2+ + 4H2O
