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Date: 31-10-2019
679
Date: 20-9-2020
1476
Date: 18-10-2019
2366
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The direct reaction of a carboxylic acid with an amine would be expected to be difficult because the basic amine would deprotonate the carboxylic acid to form a highly unreactive carboxylate. However when the ammonium carboxylate salt is heated to a temperature above 100 oC water is driven off and an amide is formed.
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دراسة: طريقة قيادة السيارة قد تكشف عن مرض نفسي لدى السائق
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بتكنولوجيا خاصة.. إنتاج حرير روسي عالي الجودة
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شاهد بالصور مراحل انجاز جديدة يدخلها مشروع صحن العقيلة زينب (ع)
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