elo the surface of the solution in the Part C: Properties of Hydrogen 1. What ha
ID: 706867 • Letter: E
Question
elo the surface of the solution in the Part C: Properties of Hydrogen 1. What happened as you thrust the burning splint halfway into the botle of hydrogen removed it? 2. What happened when you tested each of the two bottles containing a mixture of air and hydrogen? Was there any difference between the explosions from each bottle? 3. Compare the results obtained from testing the third and fourth bottles for combustion. 4. What new substance was formed when hydrogen reacted with oxygen? 5. Write a balanced chemical equation for this reaction.Explanation / Answer
(1) When the burning splint is inserted halfway into a bottle of hydrogen, a squeaky pop sound (small explosion occurs as hydrogen gas is highly inflammable and forms explosive mixture with air) is heard, and on bringing out the splint again relights.
(2) Bottle containing mixture of hydrogen and air (i.e., oxygen) will produce louder pop sound compred to hydrogen alone (since hydrogen combines with oxygen to form water). Note: Since water ie., H2O is formed, the bottle contain double the volume of hydrogen compared to oxygen or air (ie., 2:1) will produce the louder pop sound.
(3) Bottle containing hydrogen gas alone will produce squeaky pop sound compared to mixtures of air and hydrogen which will produce louder pop sound. The sound of the explosion for air-hydrogen mixture will depend upon the proportion of the two components ie., hydrogen and oxygen. The one containing 20-40% volume of hydrogen and rest of air will produce the loudest pop sound. While if the bottle contain other gas such as nitrogen, carobon dioxide etc, the spinter gets extinguished as the are not inflammable. While the splinter reignites when inserted into a bottle of oxygen gas.
(4) Hydrogen upon burning with oxygen forms water vapour.
(5) 2H2 (g) + O2 (g) = 2H2O (g)
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