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ICSE Class 8 Chemistry Question 15 of 18

Hydrogen — Question 2

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Question

Question 7

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.

Soap bubble experiment to prove that hydrogen is lighter than air. Hydrogen, Simplified Chemistry Dalal Solutions ICSE Class 8.

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.

Draw labeled diagrams to prove that hydrogen is lighter than air. Hydrogen, Simplified Chemistry Dalal Solutions ICSE Class 8.

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.