英国诺丁汉代写作业:柠檬烯

2020-01-25 19:28

女王学院的研究表明，柠檬烯是一种非极性的液体共价烃，聚苯乙烯也是一种非极性的共价烃聚合物。由于这两种物质都是非极性物质，所以它们的分子中电子的分布更对称，因此在相对的两边没有电荷的聚集，因此电荷相互抵消。它们有弱的分子间作用力，叫做范德华力。范德华力是临时偶极子之间的引力，它是分子内部电子密度的临时变化，导致临时偶极子的形成，从而使另一个分子的另一个原子产生临时偶极子。非极性物质不能溶于水或其它极性物质，但它们会溶于非极性物质。这是基于“同类溶解同类”规则，它指的是极性和非极性溶剂和溶质。例如，如果水是极性的而油是非极性的，水就不会溶解油。非极性物质不溶于极性物质，因为溶剂分子之间的吸引力要大于非极性溶质分子之间的吸引力。然而，在非极性溶剂如柠檬烯中，与其他非极性溶质如聚苯乙烯有相似的强度，使得聚苯乙烯与柠檬烯之间有了新的相互作用。因此，溶质聚苯乙烯溶于溶剂柠檬烯中。由于聚苯乙烯泡沫塑料主要是由空气组成的，所以溶解使其降解并坍缩到一个小得多的体积。最后，产品是一种像胶水一样的物质，具有粘性，可以把东西粘在一起。
英国诺丁汉代写作业:柠檬烯
From research in Queen’s College, Limonene is a non-polar liquid covalent hydrocarbon, and Styrofoam is also a non-polar covalent hydrocarbon polymer. Since both two are non-polar substances, they are where the molecules have electrons that are distributed more symmetrically and therefore do not have a congregation of charges at the opposite sides and thus the charges all cancel out each other. They have weak intermolecular forces called Van Der Waals forces. Van Der Waals force is an attraction between temporary dipoles, and it is where there is temporarily changing electron density within molecules resulting in the formation of a temporary dipole which can induce a temporary dipole on another atom of another molecule. Non-polar substances cannot be dissolved in water and other polar, but they will be dissolved in non-polar substance. This is based on ‘like dissolves like’ rule, and it refers to polar and non-polar solvents and solutes. For example, if water is polar and oil is non-polar, water will not dissolve oil. Non-polar substances don’t dissolve in polar substance, because the attraction between the solvent molecules is stronger than the attraction between the nonpolar solute molecules. However, in non-polar solvent such as limonene, has similar strength with other non-polar solutes like Styrofoam allowing to have new interactions between the Styrofoam and limonene. Therefore, solute Styrofoam dissolves in the solvent limonene. The dissolution makes Styrofoam be degraded and collapse to a much lower volume since it is mostly made up of air. At the end, the product is a substance like glue which is sticky and stick things together.