Identify the catalyst-containing systems below as homogeneous or heterogeneous. Catalysts (4 items) (Drag and drop into the appropriate area below) NO (g) for the oxidation of SO2 (g) to SO3 (g) KI (aq) for the decomposition of H2O2 (aq) H2 (g) bonded to a metal surfacePd (s) coating that converts noxious gas to less harmful gases

Answer:Homogeneous catalysts:NO (g), KI (aq.)

Heterogeneous catalyst:H₂ (g) bonded to a metal surface, Pd (s) Coating

Explanation:

Homogeneous catalysis is a catalysis reaction in which the reactants as well the catalyst catalyzing the reaction are in the same phase that is, the catalyst and reactants have same phase.

In the examples NO (g) which acts as a catalyst for the oxidation of SO₂ (g) to SO₃ (g) is in the same gaseous phase as the reactant SO₂ (g). So this is an example of homogeneous catalysis.

In the example KI (aq.) which acts as a catalyst for the decomposition of H₂O₂ (aq.) is in the same aqueous phase as reactant H₂O₂ (aq.). So this is an example of homogeneous catalysis.

Hence NO (g) and KI (aq.) are homogeneous catalysts.

Heterogeneous catalysis is a catalysis reaction in which the reactants and catalyst are in different phase. That is the catalyst and reactant do not have same phase.

In the examples H₂ (g) bonded to a metal surface is an example of heterogeneous catalysis as the phase of H₂ (g) and metal surface (s) are different hence this is an example of heterogeneous catalysis.

The Pd (s) acting as a catalyst for the conversion of noxious gas to less harmful gas is also an example of heterogeneous catalyst as the phase of Pd (s) and gases are different. Pd (s) is solid and the gases are gaseous in nature.