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Practice Question 2 Hydrogen peroxide water + oxygen 2H2O22H2O+O2 The rate of reaction can be increased using a catalyst, manganese(IV) oxide. When manganese(IV) oxide is added to hydrogen peroxide, bubbles of oxygen are given off. Practice Question 2 Hydrogen peroxide water + oxygen 2H2O22H2O+O2 Catalyst: manganese(IV) oxide. Practice Question 2 Catalase Catalase is an enzyme present in almost all cells. Potato and liver are two common sources of catalase used for experiments in school. A student places either small pieces of potatoes or small pieces of liver in the reaction mixture. Practice Question 2 Hydrogen peroxide water + oxygen 2H2O22H2O+O2 Predict what would happen if we put the following catalyst (or source of catalyst) in the reaction Practice Question 2 Hydrogen peroxide water + oxygen 2H2O22H2O+O2