... it will convert the hydrogen peroxide and oxygen gas will be evolved. The evolution of gas causes bubbles to form and is indicative of a positive test. Part I. Materials: Equipments: • MnO2 (inorganic catalyst) • 8 test tubes • H2O2 • thermometer • potato • beaker • liver • mortar • sand • wooden splint • ruler Procedure: I. 2 cm3 of H2O2 is put in 8 test tubes. II. 5 cubes (1cm3) of liver and potato is cut. III. The followings are added to test tubes 1 to 8. 1. a sprinkle of sand 2. 2 cm3 of MnO2 3. one cube of liver 4. tube 3. is repeated, the temperature of the H2O2 is measure before and after the addition of the liver 5. tube 3. is repeated, a bung is put in the test tube, firmly hold and tested for oxygen (a glowing wooden splint is used) 6. one cube of boiled liver (boiled in a beaker of water for 15 min) 7. one cube ...

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