BLOWING MIND


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#fact


Miss Universe of 2021... Harnaaz Sandhu...👑👑👑👑👑


(1733-1804), the English philosopher and experimental chemist, is best known for his contribution to the chemistry of gases. He discovered 10 new gases including oxygen, sulphur dioxide and carbon monoxide.

#KnowYourScientist


Cloudsthetics 🌧📚 dan repost
synthetic fibres and plastic notes.pdf
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Handwritten Notes
For Class : 8th
Topic : Synthetic Fibres And Plastics
Written By : Admin
For more : @cloudsthetics_12
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Msg on @studystudyyy


The French chemist Antoine Lavoisier conducted his famous 12-day expiriment in 1775. He heated some mercury in a retort. The mouth of the retort was inserted in an inverted bell jar placed in a trough filled with mercury. The heating was continued for 12 days.
He observed the formation of a red layer of mercury (II) oxide on the surface of mercury. He also observed that the level of mercury in the bell jar rose by one-fifth of the total volume of the bell jar. He found that the remaining gas in the bell jar could not support combustion.


#discoveryofoxygen


In 1774, Joseph Priestley, an English chemist, discovered oxygen by heating mercury (II) oxide using the infrared rays of the sun.

#discoveryofoxygen


In 1772, Carl Wilhelm Scheele, a Swedish chemist, obtained oxygen by heating potassium nitrate (KNO3) and mercury (II) oxide (HgO). He called the gas 'fire air' since it was found to support combustion.

#discoveryofoxygen


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