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4h 50m | v1 |
Chemistry deals with elements and compounds composed of atoms, molecules and ions and with their ...
3h 27m | v1 |
يعتبر علم الكيمياء من العلوم الطبيعية فهو يهتم بدراسة المادة وتركيبها وبنيتها وخواصها والتغيرات ا...
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