Introduction Oxygen can be obtained by decomposing certain oxygen containing com

Question

Introduction Oxygen can be obtained by decomposing certain oxygen containing compounds. Hydrogen peroxide is such a compound and is used in this experiment. The rate of decomposition of hydrogen peroxide at room temperature is slow. Manganese(IV) oxide (MnO2) is added as a yst to increase the rate of decomposition. Manganese(IV) oxide is a heterogeneous catalyst since it not soluble in hydrogen peroxide solution and is not a source of oxygen i not a reactant in a chemical reaction, so is often shown on the arrow in the experiment. A catalyst is the chemical equation. The following equation shows the chemical change that occurs in decomposition of hydrogen peroxide. Word Equation: Hydrogen peroxide ? Water + Oxygen MnO2 Formula Equation2 H:O2 (aq) 2 H:O (D) + 02 (g) The oxygen is collected by a method known as the "downward displacement of water." The gas produced passes through the delivery tube into a bottle of water inverted in a pneumatic trough. The oxygen is only slightly soluble in water and is much lighter than water. Oxygen will rise in the bottle to force the water out. Oxygen is a strong oxidizer and supports combustion: It accelerates (or is required in) many chemical reactions. In this experiment, the role of oxygen with glowing wood splints, glowing steel wool and burning candle will be investigated. Materials and Eawipment Manganese(IV) oxide (MnO:) 250 mL Erlenmeyer flask Candle wood splints- 9% hydrogen peroxide solution (H2O2) thistle tube fine steel wool ring stand clamp 20 to 25 cm length rubber tubing two-hole rubber stopper five wide-mouth bottles 50-mL graduated cylinder spatula pneumatic trough five glass plates Bunsen burner crucible tongs

Explanation / Answer

4. The candle burnt brighter in oxygen than in air. However, it burnt for shorter time in oxygen than in air. This is because a higher concentration of oxygen is available now which would speed up the burning process of candle. Same reason is for the brightness of flame, more oxygen gives brighter flame.

5. Hydrogen gas is a highly combustible gas and proper care must be taken when handling and storing this gas. It is also much lighter than oxygen or air and will rise faster into the column compared to oxygen gas. The gas is however collected the same way in both the cases.

6. No Managnese(IV) oxide acts as the catalyst and hence did not change even after the reaciton. It only lowers the energy of activation for the decomposition of H2O2 without getting changed in the process.

7. The first jar would have least amount of oxygen in it as it also contains air which was present at the initial condition in the flask and system.

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