SOME BASIC CONCEPTS OF CHEMISTRY

UNIT 1 SOME BASIC CONCEPTS OF CHEMISTRYC hemistry is the science of molecules and theirtransformations. It is the science not so much of the onehundred elements but of the infinite variety of molecules thatmay be built from HoffmannScience can be viewed as a continuing human effort tosystematise knowledge for describing and understandingnature. You have learnt in your previous classes that we comeacross diverse substances present in nature and changes inthem in daily life. Curd formation from milk, formation ofvinegar from sugarcane juice on keeping for prolonged timeand rusting of iron are some of the examples of changes whichwe come across many times.

metals, like gold, silver , tin and copper . A book, Rsar navam, appeared around 800 CE. It discusses the uses of various furnaces, ovens and crucibles for different purposes. It describes methods by which metals could be identified by flame colour . Chakrapani discovered mercury sulphide. The credit for inventing soap also goes to him.

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