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Карта сайта Интеллектуальная поисковая системаДобавить свою ссылку по ключевому запросуПоисковая система v3.kz поможет ускорить индексацию вашего сайта выводит в Топ |
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It is covalent due to the small electronegativity difference between hydrogen and sulfur. The angle is 92 degrees, rather than the 105 degrees in water. Both are bent because there are four electron pairs, two of which are bonding, and two are lone In H2O with all the smaller sized O-atom on the opposite, this is the situation therefore the bonds are usually forced further separate to reduce energy. hydrogen sulphide physical properties. This small difference between the predicted angle and the observed angle can be explained by proposing that the unshared pair of electrons on nitrogen repels the adjacent bonding pairs more strongly than the bonding pairs repel each other. The experimental HOH bond angle is only slightly smaller, but the effect is noticable. This is because the entire subject of predicting bond angles is a lot more tricky than it was displayed to you. Take phosphane and hydrogen sulphide, the heavy analogues to ammonia and water. The bond pair-bond pair is smaller in magnitude, still the bond pair-bond pair repulsion (steric effect) between the hydrogen in water is bigger than in hydrogen sulfide because oxygen is smaller. A hydrogen bond is the electrostatic attraction between polar groups that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom. The dipole moment of hydrogen sulphide is 0.97 Debye, less than that of H2O (1.84 D), meaning that it is a less polar molecule. This is due to the smaller Generally, more lone pairs means a stronger "crowding" effect, and bond angles that deviate further from ideal values: The angle between the oxygen-hydrogen bonds in water is even smaller than the ideal value, because there are two lone pairs squeezing the bonding groups together. Информация взята v3.kz |
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