Question

hink and answer:
1. Explain the role of manganese dioxide in the preparation of oxygen from
hydrogen peroxide and potassium chlorate.
2. Write the balanced chemical equations for the preparation of oxygen
from hydrogen peroxide and potassium chlorate.
3. Explain how the oxygen gas is collected in the laboratory.
4. How can you identify the oxygen gas?
5. Out of the two methods demonstrated for the preparation of oxygen,
which one will you prefer for preparing oxygen gas in the laboratory and
why?
6. Copy and complete the following table:​

Answer 1

Answer:

1. Manganese dioxide catalyzes the decomposition of hydrogen peroxide to oxygen and water. Since manganese dioxide is a catalyst, it is not consumed in the reaction. ... Therefore, the rate of catalyzed is 1073 times the rate of the uncatalyzed.
2. By decomposition of oxygen rich compounds
4. 2KMnO4heatK2MnO4+MnO2+O2
6. 2KClO3heat2KCl+3O2(Lab method)
8. By the action of water on Na2O2
10. 2Na2O2(s)+2H2O(l)→4NaOH(aq)+O2(g)
12. Manufacture
14. The main source are air and water. It can be prepared by the electrolysis of water. From liquefaction of air we can also obtain oxygen by fractional distillation of liquid air.
16. To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.
17. Oxygen. Oxygen supports combustion so a good method of testing for oxygen is to take a glowing splint and place it in a sample of gas, if it re-ignites the gas is oxygen. This is a simple but effective test for oxygen.
18. 2KClO3(s)heatcatalyst2KCl(s)+3O2(g)
19. In the above reaction, potassium chlorate(KClO3) decomposes to form potassium chloride(KCl) and oxygen(O2). Also as shown in the equation, heat is supplied for the reaction to take place. Therefore, it is a decomposition reaction which is also endothermic in nature.