| 单词 | covalent bond |
| 例句 | We, in brilliant contrast, are completely organized structures, squirming with information at every covalent bond. The Lives of a Cell 1974-01-01T00:00:00Z Azide groups form a robust covalent bond with graphite through a chemical reaction facilitated by ultraviolet light, ensuring the structural integrity of graphite during its expansion and contraction. Making electric vehicles last 2023-11-02T04:00:00Z In a polar covalent bond, the electrons shared by the atoms spend more time closer to one nucleus than to the other nucleus. Concepts of Biology 2013-04-25T00:00:00Z Alcohols are covalent molecules; the –OH group in an alcohol molecule is attached to a carbon atom by a covalent bond. Chemistry 2019-02-14T00:00:00Z During this process, the hydroxyl group of one monosaccharide combines with the hydrogen of another monosaccharide, releasing a molecule of water and forming a covalent bond. Biology for AP Courses 2022-06-09T00:00:00Z The bond formed by sharing electrons is called a covalent bond. Miller & Levine Biology 2018-01-01T00:00:00Z A non-polar covalent bond occurs when electrons are shared equally between the two atoms. Environmental Biology 2018-09-06T00:00:00Z Figure 2.4 Depiction of a covalent bond between two chlorine atoms. Physical Geology 2015-01-01T00:00:00Z One popular theory holds that a covalent bond forms when a pair of electrons is shared by two atoms and is simultaneously attracted by the nuclei of both atoms. Chemistry 2019-02-14T00:00:00Z Each of its four hydrogen atoms forms a single covalent bond with the carbon atom by sharing a pair of electrons. Biology for AP Courses 2022-06-09T00:00:00Z The silicon ion shares one of its four valence electrons with each of the four oxygen ions in a covalent bond to create a symmetrical geometric four-sided pyramid figure. An Introduction to Geology 2017-01-01T00:00:00Z In a single covalent bond, a single electron is shared between two atoms, while in a double covalent bond, two pairs of electrons are shared between two atoms. Anatomy and Physiology 2013-06-19T00:00:00Z In the mineral diamond, the carbon atoms are linked together in a three-dimensional framework, where one carbon atom is bonded to four other carbon atoms and every bond is a very strong covalent bond. Physical Geology 2015-01-01T00:00:00Z The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Chemistry 2019-02-14T00:00:00Z Interaction between cysteine side chains forms disulfide linkages in the presence of oxygen, the only covalent bond forming during protein folding. Biology for AP Courses 2022-06-09T00:00:00Z This was in the correct position to form a strong covalent bond with the amino acid previously attached to the second strand. Origin of Life Theory Involving RNA–Protein Hybrid Gets New Support 2022-05-18T04:00:00Z A disulfide bond is a covalent bond between sulfur atoms in a polypeptide. Anatomy and Physiology 2013-06-19T00:00:00Z In a second step, the covalent bond is broken through a hydrolysis reaction, releasing the product of the enzymatic reaction and restoring the reactive nucleophile for a second round of catalysis. Enzymes engineered to trap reaction intermediates 2018-12-11T05:00:00Z A coordinate covalent bond also results when an ammonia molecule combines with a hydrogen ion to form an ammonium ion. Chemistry 2019-02-14T00:00:00Z A monomer joins with another monomer with the release of a water molecule, leading to the formation of a covalent bond. Biology for AP Courses 2022-06-09T00:00:00Z Like other nerve agents, it would form a stable covalent bond with a serine group in the cleft. U.K. attack shines spotlight on deadly nerve agent developed by Soviet scientists 2018-03-19T04:00:00Z A peptide bond is a covalent bond between two amino acids that forms by dehydration synthesis. Anatomy and Physiology 2013-06-19T00:00:00Z But non-covalency had yet to be accepted along with covalent bond formation as a tool of equal synthetic capability. Lindau 2013: Supramolecular chemistry - Moving away from synthesis and toward design 2013-07-03T15:15:05.943Z We refer to this as a pure covalent bond. Chemistry 2019-02-14T00:00:00Z Each amino acid is attached to another amino acid by a covalent bond, known as a peptide bond, which is formed by a dehydration reaction. Biology for AP Courses 2022-06-09T00:00:00Z Each sugar-phosphate unit is joined to the next by a tough covalent bond, which needs a lot of energy to break. DNA: the 'smartest' molecule in existence? 2013-04-24T16:55:10Z Locklin and his colleagues sprayed the substance onto materials and exposed them to ultraviolet light, which causes a covalent bond with the host material. New Antibacterial Clothing: Secret Ingredient Revealed 2011-07-09T13:33:59Z The great advantage of non-covalent association is that, unlike covalent bond formation, it is reversible. Lindau 2013: Supramolecular chemistry - Moving away from synthesis and toward design 2013-07-03T15:15:05.943Z In the case of Cl2, each atom starts off with seven valence electrons, and each Cl shares one electron with the other, forming one covalent bond: Chemistry 2019-02-14T00:00:00Z Ionic bond involves the transfer of electrons whereas covalent bond involves the sharing of electrons. Biology for AP Courses 2022-06-09T00:00:00Z This unequal distribution of electrons is known as a polar covalent bond, characterized by a partial positive charge on one atom and a partial negative charge on the other. Chemistry 2019-02-14T00:00:00Z Electrons in a polar covalent bond are shifted toward the more electronegative atom; thus, the more electronegative atom is the one with the partial negative charge. Chemistry 2019-02-14T00:00:00Z We measure the strength of a covalent bond by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Chemistry 2019-02-14T00:00:00Z Since the bonding atoms are identical, Cl2 also features a pure covalent bond. Chemistry 2019-02-14T00:00:00Z An ionic bond involves the transfer of electrons whereas a covalent bond involves the van der Waals force of interaction. Biology for AP Courses 2022-06-09T00:00:00Z For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. Chemistry 2019-02-14T00:00:00Z The energy required to break a specific covalent bond in one mole of gaseous molecules is called the bond energy or the bond dissociation energy. Chemistry 2019-02-14T00:00:00Z The mutual attraction between this negatively charged electron pair and the two atoms’ positively charged nuclei serves to physically link the two atoms through a force we define as a covalent bond. Chemistry 2019-02-14T00:00:00Z When the atoms linked by a covalent bond are different, the bonding electrons are shared, but no longer equally. Chemistry 2019-02-14T00:00:00Z Ionic bond involves the van der Waals force of interaction whereas covalent bond involves the sharing of electrons. Biology for AP Courses 2022-06-09T00:00:00Z For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. Chemistry 2019-02-14T00:00:00Z Ionic bond involves the sharing of electrons whereas a covalent bond involves the transfer of electrons. Biology for AP Courses 2022-06-09T00:00:00Z In a polar covalent bond, shown in this figure, the electrons are unequally shared by the atoms and are attracted more to one nucleus than the other. Biology for AP Courses 2022-06-09T00:00:00Z |
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