A college-campus-size iceberg spotted on the Antarctic Peninsula margins is upending public expectations of. In ice crystals, the 104.45 degree bond angle in a gas phase (isolated) molecule is opened up to around 106.6 degrees, not quite equal to the tetrahedral angle, so the hydrogen bonded atoms are not all on the same straight line as covalently bonded atoms (see ). The rectangular iceberg was photographed as part of a topographic mapping project. The berg actually appears to be more a trapezoid shape than a. Instead, a casually tweeted photo of a strange. NASA 'The once-long rectangle berg did not make it through unscathed it broke into smaller bits,' NASAs Earth Observatory reports. Harbeck captured both the edge of the rectangular iceberg, and a slightly less rectangular iceberg. View gallery - 9 images A few days ago NASAs IceBridge project hit the news, but not for any of its impressive scientific observations. Looked at along the C3 axis of symmetry, one sees hexagonal cross-sections, so the 120 degrees is not directly related to the H-O-H bond angle. It's an iceberg, shared online by NASA last Wednesday, that appears to be in the shape of a perfect rectangle with smooth, even walls, and 90-degree angles. The rectangular iceberg appeared to be freshly calved from Larsen C, which in July 2017 released the mammoth A-68 ‘ice island,’ a chunk of ice about the size of the state of Delaware. Since oxygen atoms form only 2 covalent bonds each, two of the 4 directions are to covalently bonded hydrogen atoms in an H2O molecule, and the other two directions are in longer “hydrogen bonds” to H atoms in other H2O molecules. Carbon atoms form 4 bonds each, at roughly tetrahedral angles (109.47 degrees). Hexagonal crystals form in ice-I (the most common form of ice) because the H2O molecules are hydrogen-bonded together into roughly cyclohexane chair conformations, an oxygen atom occupying the position of each carbon atom in cyclohexane, C6H12: see. In a world besieged by climate change -induced chaos and disruption, one satisfying image of order has emerged.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |