CBSE 9th– Chemistry– Atoms and molecules
History of finding the smallest particle of a matter: Indian and Greek philosophers tried to find which is the smallest particles of matter Around 500 BC, Indian Philosopher Kanaada postulated…
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ICSE 7th – Chemistry- Air, Oxygen and Oxides- Test Paper
Fill in the blanks(5 marks) The molecular formula of Oxygen is ____________ Percentage Composition of carbon dioxide in air is ___________ In preparation of oxygen the catalyst used is ____________…
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CBSE 9- Science-Chemistry- Structure of Atom – Notes
Structure of the atom Discovery of charged particles in matter Goldstein in 1886 discovered presence of new radiations in gas discharged and called them canal ray These rays were positively…
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CBSE 10- Chemical equations-questions from previous year question papers
Take 3 g of Barium Hydroxide in a test tube and now add about 2g of ammonium chloride and mix the contents with the help of a glass rod. Now…
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CBSE-10-Chemistry-Chemical Reactions-Mind Map
Mind mapping is a way /tool , which helps to memorize information by representing any information visually. This helps the students for to remember and revise the important points of…
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