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	Experiment 8.5 – decomposition of hydrogen peroxide. The oxides that act as catalysts are those of the transition metals which have incomplete electron shells in their ions. Liver contains catalase that catalyses the breakdown of hydrogen peroxide in cells, found in many plants and animals (prevents accumulation of h2o2 produces by some enzyme systems, if h2o2 was allowed to build up in cells it would start to oxidise metabolites (all stuff in cells). Rochelle salt and h2o2 react slightly when warm, but reaction is catalysed by cobalt II ions. While it’s reacting, it turns green, showing the catalyst taking part in the reaction but returns to the original pink colour showing the catalyst is unchanged when the reaction is complete. Co2+ are oxidised (green) then reduced. Hydrolysis of sulphamic acid Nh2so2oh + h2o à nh4+ + hs04 -. Order of effectiveness of catalysts. – hcl – strong acid Ch3co2h – weak acid H20 H+ acts as a catalyst . inceasing it concentration increases catalytic effect. Hydrolysis of urea This reaction is unusual, as the enzyme must work in acid conditions. This is because one of the products is alkaline most enzymes work under neutral or acidic conditions. Word Count: 197

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