Platinum is used to catalyze the hydrogenation of ethylene: H_2 (g) + CH_2 CH_2

Question

Platinum is used to catalyze the hydrogenation of ethylene: H_2 (g) + CH_2 CH_2 (g) rightarrow^Pt(s) CH_3 CH3 (g) Chlorofluorocarbons (CFCs) catalyze the conversion of ozone (O_3) to oxygen gas (O_2): 2O_3 (g) rightarrow^CFC(g) 3O_2 (g) Magnesium catalyzes the disproportionation of hydrogen peroxide to produce water and oxygen: 2H_2 O_2 (aq) rightarrow^Mg(s) 2H_2 O (l) + O_2 (g) What type of catalysts are platinum, CFCs, and magnesium under these conditions? Drag the appropriate items to their respective bins.

Explanation / Answer

Platinum (Pt) and Magnesium (Mg) are examples of heterogeneous catalysts as they both exist in a different state of matter i.e., both solids while the reaction mixture is in gas state for Pt and that of liquid state for Mg.

CFCs are homogeneous catalysts as both the catalyst and the reactants exist in gaseous phase.

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