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Date: 7-7-2019
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Date: 16-8-2019
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Date: 18-9-2018
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alkenes
An alkene, sometimes called an olefin, is a hydrocarbon that contains a carbon–carbon double bond. Alkenes occur abundantly in nature. Ethylene, for instance, is a plant hormone that induces ripening in fruit, and a-pinene is the major component of turpentine. Life itself would be impossible without such alkenes as b-carotene, a compound that contains 11 double bonds. An orange pigment responsible for the color of carrots, b-carotene is an important dietary source of vitamin A and is thought to offer some protection against certain types of cancer.
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ما أبرز التغيرات التي تحدث عند الرجال عندما يصبحون آباءً؟
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حقائق مثيرة للاهتمام حول الأرض
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شعبة التوجيه الديني النسوي تقيم حفلاً بذكرى عيد الغدير الأغر
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