Transition Metals Flashcards
What is the contact process?
-SO2 -> SO3
-Using V2O5 catalyst
Give the equations of the contact process?
1) V2O5 + SO2 -> SO3 + V2O4
2) V2O4 + 1/2O2 -> V2O5
What is a homogenous catalyst?
When the catalyst is in the same state as the reactants.
What is a heterogenous catalyst?
When the catalyst is in a different state to reactants.
How does a heterogenous catalyst work?
Reactants adsorb to the active site of catalyst this weakens bonds then they will then desorb
How does a homogenous catalyst work?
Forms an intermediate species which reacts to reform the catalyst.
What is autocatalysis?
Is a homogenous catalyst where the product is the catalyst itself.
What is an example of auto catalysis?
Mn2+ in the reaction o MnO4- and C2O4 2-
What are the different oxidation states of Vanadium?
+1
+2
+3
+4
+5
What colour is Vanadium +2?
Violet
What colour is Vanadium +3?
Green
What colour is Vanadium +4 and what is its formula?
-VO +2
-Blue
What colour is Vanadium +5 and what is its formula?
-VO2+
-Yellow
How is VO2+ reduced to form V2+?
Zinc in acid
What is the formula of tollens reagent?
[Ag(NH3)2]+
What is the formula used to find the energy difference between ground and excited state of d-shell electrons?
∆E = hν = hc/λ
what is h in ∆E = hν = hc/λ
Plancks constant
What is the v in ∆E = hν = hc/λ
Frequency of absorbed light (Hz)
What is the λ in ∆E = hν = hc/λ
Wave length (m)
What is the c in ∆E = hν = hc/λ
The speed of light (3×10^8 m/s)
Why are transition metal ions coloured?
As they absorb some visible light wavelengths to promote electrons in d-subshells, which transmits the remaining light to produce a colour.
What is the Chelate effect?
The replacement of monodentate ligands with bidentate and multidentate ligands in complex ion
Why is carbon monoxide toxic?
As it substitutes the oxygen ligands on the Fe2+ in haemoglobin (the ligands formed are stronger so oxygen can no longer bond)
How many ligands can Cl- form and why?
4 as they a large
