Chemistry
Draw labeled diagrams for two experiments to prove that - hydrogen is lighter than air.
Answer
Experiment 1
Procedure : Bubble hydrogen gas by means of a small pipe into a dish containing soap solution.
Observation : Soap bubbles filled with H2 rise upwards.
Conclusion : Hydrogen is lighter than air hence soap bubbles filled with hydrogen rise up.
Experiment 2
Procedure : Take two dry test tubes.
Test tube 'A' - Filled with hydrogen.
Test tube 'B' - Filled with air.
Place test tube 'B' over test tube 'A' and test the gas in the upper test tube 'B' with a glowing splinter.
Observation : A 'pop' sound is heard in test tube 'B'. [hydrogen burns with a 'pop' sound].
Conclusion : Hydrogen is lighter than air and has moved upwards displacing the air.
Related Questions
In the industrial method of preparation of hydrogen by the Bosch process - give
(a) Balanced equations for the first two main steps in the production of hydrogen
(b) The reason for use of addition of a promoter to the catalyst in the final step.
(c) The name of the solution which absorbs the unreacted carbon monoxide.
State the following pertaining to the physical properties of hydrogen :
(a) Colour & odour
(b) Solubility in water
(c) Effect on moist blue litmus paper.
Starting from hydrogen gas how would you obtain
(a) A neutral liquid
(b) A basic gas
(c) A metal by reduction of its heated oxide.
[the metal formed is above iron in the activity series]
Using a burning candle and a jar of hydrogen - how would you prove experimentally that
(a) Hydrogen is a combustible gas
(b) Hydrogen does not support combustion.