15.11 catalysts based on transition elements & their compounds

Question 1

what are catalytic converters?

Answer 1

ceramic honeycomb covered with a thin layer of Pt/Pd/Rh to increase surface area

Question 2

what type of catalysis is catalytic converters?

Answer 2

heterogeneous

Question 3

how do catalytic converters work?

Answer 3

1- CO & NO molecules adsorb onto active site of catalyst
2- bonds in reactant are weakened & break
3- new bonds form between reactants
4- desorption of CO2 & N2 product molecules from surface

Question 4

what are homogenous catalysis?

Answer 4

reaction proceeds through intermediate species

Question 5

how could Fe2+ be used for reacting I- & S2O4 2-?

Answer 5

E cell value in between: could reduce S2O8 2- & oxidise I-

Question 6

why should the conical flask be heated during titration of MnO4- ions & C2O4 2- ions?

Answer 6

1- both ions are negative: energy needed to overcome repulsion
2- sufficient Mn2+ autocatalyses reaction