Transcription of SOME BASIC CONCEPTS OF CHEMISTRY
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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.
cement has been used in the construction work. It contains lime, sand and traces of CaCO 3. Harappans made faience, a sort of glass which was used in ornaments. They melted and forged a variety of objects from metals, such as lead, silver, gold and copper. They improved the hardness of copper for making artefacts by using tin and arsenic.
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