User talk:Pedro Silva
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Welcome, Pedro! --Larry Sanger 02:33, 1 November 2006 (CST)
chemistry
You deleted the part in the chemistry page that distictively states what differentiates chemical reactions from physical: chemical reactions only involve electrons of atoms/molecules. I would like to put that very basic and important thing back!
modification of chemistry page
You deleted the part in the chemistry page that distictively states what differentiates chemical reactions from physical: chemical reactions only involve electrons of atoms/molecules. I would like to put that very basic and important thing back!