Crystal structure melting point affected

Hydrogen bonds play an important part in determining such properties as solubility, melting points, and boiling points, and in affecting the form and stability of crystal structures. They play a crucial role in biological systems. For ex-... 

Comparing and Contrasting Nonionic compounds do not exist in crystal lattice structures but rather as individual particles, which are affected by other particles. In other words, nonionic compounds experience forces between particles. Based on what you learned in Part B about the melting points of ionic versus nonionic compounds, how do you think the attractive energy between particles compares with the energy of the crystal lattice ... 

Knowledge about the detailed structures of the triglycerides present in palm oil is important because they define some of the physical characteristics of the oil. The melting points of triglycerides are dependent on the structures and position of the component acids present. They also affect the crystallization behavior of the oil. The semisolid nature of palm oil at room temperature has been attributed to the presence of the oleo-disaturated fraction. 

To date, we have identified homologous series of monomethylalkanes, n-alkylcyclohexanes, methyl-M-alkylcyclohexanes, -alkylcyclopen-tanes, n-alkylbenzenes, -alkyltoluenes and n-alkylxylenes, in waxy crude oils. Each of these compounds has unique physical properties, and will affect the overall behaviour of an oil (e.g. melting point properties and wax crystal arrangement). Identification of these compounds will improve any efforts to model or predict the wax deposition potential of oils. As we come to know the exact structure of constituents in the HMWHC fraction, we will be able to gain better insights into the origin and mechanisms for the formation of HMWHCs in crude oils and source rocks. 

Ionic solutions are formed when the solute ionizes in water. The ions of the molecule separate in water and are surrounded or hydrated by the water molecules. Ionic molecules greatly influence the mobility of water molecules surrounding them and affect the colligative properties of solvent water. The degree to which the structure of bulk water is disrupted depends on the valence, size, and concentration of the ion in solution. In ice, the presence of ions interferes with intermolecular forces between water molecules and disrupts the crystal lattice structure. Hence the presence of salt decreases the melting point of water. 

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