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اقوى مذكرة كيمياء انجلش للصف الثانى الثانوى لغات بتعديل 2013

07092012
اقوى مذكرة كيمياء انجلش للصف الثانى الثانوى لغات بتعديل 2013

Chapter one
Structure of the atom
Atomic structure
1- Greek philosophers:
Any piece of matter can be divided into smaller parts and each part can be subdivided into smaller parts which can't be divided this part is called Atom.
2- Aristotle
a-He refused the idea of Greek philosophers about the atom .
b- He supposed that all matters composed of 4 constituents which are ( water, air , dusta and fire and postulated that the cheap metals such as iron or copper can be changed into precious ones like gold by changing the percentage of four constituents.
3- Boyl ( lrish 1661 )
i-He refused the Aristotle concept.
ii-He was the 1st scientist to define the element as pure simple substance which can
not be analvsed into smple one by normal chemical methods.
4) Dulton s atom ( Englsh 1803 )
He supposed thet :
1- The substance consists of very amall particles called atoms.
2- Every element consists of very small dense atoms which can t be divided.
3- Atoms f the same element are identical.
4- Atome of different are different.
N.B By the 19 th century
Scientists had accepted the idea that elements consists of atoms but they knew very little about those atoms
اقوى مذكرة كيمياء انجلش للصف الثانى الثانوى لغات بتعديل 2013 3646708470

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