Oxygen : Place 25 mL of hydrogen peroxide in a 125-mL Erlynmeyer flask. Using a
ID: 557453 • Letter: O
Question
Oxygen: Place 25 mL of hydrogen peroxide in a 125-mL Erlynmeyer flask. Using a microspatula, add ½ a scoop of manganese (IV) oxide crystals. Immediately place the stopper/tubing assembly in the mouth of the flask. Position the rubber tubing under the mouth of the cylinder you are using to collect the gas. When the reaction is complete, place a glowing wood splint ‘just’ inside the mouth of the graduated cylinder as you hold the cylinder sideways.
Observations:
Effect of gas on ‘glowing’ wood splint:
Explanation / Answer
Decomposition of hydrogen peroxide (H2O2)
Manganese (IV) oxide acts as a catalysts for the decomposition of H2O2
The reaction being,
2H2O2 ---> 2H2O + O2 (g)
The O2 gas evolved is oxidizing in nature.
Obervation : When glowing wood splint is exposed to this gas, the splint burns with intense flame due to O2 atmosphere.
Effect of gas on glowing splint : The wood splint flame burns more vigorously.
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