الرئيسية » Simplified Chemistry (صفحه 17)

Simplified Chemistry

Bohr’s model of the atom

Bohr’s model of the atom Neil Bohr in 1913 observed that basic features of Rutherford’s atomic model namely presence of nucleus and revolving electrons were correct but that the electrons revolved round the nucleus in certain allowed circular orbits and that the electrons did not radiate and therefore its energy …

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Rutherford model of atom

Rutherford model of atom Rutherford observed that atom has all the positive charge concentrated in a very small central region called the nucleus and that nucleus is surrounded by negatively charged particles called electrons revolving in orbits. He proved that the force of attraction between electrons and nucleus was counter …

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Atoms

ATOMS Law of constant composition: This states that “A chemical compound (if pure) always contains the same elements combined together in the same proportion by mass regardless of bow the compound is prepared or from where it is obtained”. Law of conservation of mass: This is defined as “In every …

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جدول الذائبية Solubility Chart

جـدول الذائبـية Solubility Chart : من خلال جـدول الذائبـية يمكن التنبؤ ما إذا كان الملح أو المركب قابل للذوبان في الماء أم لا .   جـدول الذائبيـة Solubility Chart       بوسترات (لوحات) كيميائية بدقة عالية (أكثر من 25 لوحة) من تصميم الأستاذ أكرم أمير العلي   تطبيقات كيميائية …

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المونوميرات و البوليميرات (لوحة قابلة للتنزيل)

المونوميرات و البولوميرات (لوحـة قابلة للتنزيل)   بوسترات (لوحات) كيميائية بدقة عالية (أكثر من 25 لوحة) من تصميم الأستاذ أكرم أمير العلي   تطبيقات كيميائية من تصميم الأستاذ أكرم امير العلي متوفر للجوالات التي تعمل بنظام أندرويد android على سوق جوجل بلاي google play 1 – تطبيق ملصقات الجدول الدوري …

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fluorite structure

 A type of ionic crystal structure in which the cations have an expanded face-centered cubic arrangement with the anions occupy­ing both types of tetrahedral hole. The cations have a coordination number of 8 and the anions have a coordination number of 4. Examples of compounds with this structure are CaF2, …

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flunitrazepam

A benzodiazepine used medically in some countries as a powerful hypnotic, sedative, and muscle relaxant. It was marketed in the US under the trade name Rohyp­nol. Flunitrazepam has become notorious as a so-called ‘date rape’ drug. It is quickly eliminated from the body, difficult to detect, and causes amne­sia, so …

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