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ert207 analytical chemistry
ert207 analytical chemistry

... 2) How much is it (Quantitative) ...
Unit 2 Assignments Answers
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... Unlike gases, molecules in liquid phase have significantly less spaces between them. Hence, there is not enough room to compact these molecules to a smaller volume. Therefore, liquids are incompressible. Surface tension is the amount of energy required to stretch or increase the surface of a liquid ...
Exp7. Birefringence in Calcite Crystals
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... As illustrated in the figure, when the beam of polarized light is incident on the surface of crystal, the refractive indices are different since the light has both parallel and perpendicular electric field component on the optical axis. Hence, every point on the wave-front propagates as elliptic wav ...
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... freezing point of -0.102 degrees celcius. The sorbitol contains 39.56% C, 7.75% H and 52.7% O by mass. What are the molar mass and molecular formula of sorbitol? ...
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Liquid crystal



Liquid crystals (LCs) are matter in a state that has properties between those of conventional liquid and those of solid crystal. For instance, a liquid crystal may flow like a liquid, but its molecules may be oriented in a crystal-like way. There are many different types of liquid-crystal phases, which can be distinguished by their different optical properties (such as birefringence). When viewed under a microscope using a polarized light source, different liquid crystal phases will appear to have distinct textures. The contrasting areas in the textures correspond to domains where the liquid-crystal molecules are oriented in different directions. Within a domain, however, the molecules are well ordered. LC materials may not always be in a liquid-crystal phase (just as water may turn into ice or steam).Liquid crystals can be divided into thermotropic, lyotropic and metallotropic phases. Thermotropic and lyotropic liquid crystals consist of organic molecules. Thermotropic LCs exhibit a phase transition into the liquid-crystal phase as temperature is changed. Lyotropic LCs exhibit phase transitions as a function of both temperature and concentration of the liquid-crystal molecules in a solvent (typically water). Metallotropic LCs are composed of both organic and inorganic molecules; their liquid-crystal transition depends not only on temperature and concentration, but also on the inorganic-organic composition ratio.Examples of liquid crystals can be found both in the natural world and in technological applications. Most contemporary electronic displays use liquid crystals. Lyotropic liquid-crystalline phases are abundant in living systems. For example, many proteins and cell membranes are liquid crystals. Other well-known examples of liquid crystals are solutions of soap and various related detergents, as well as the tobacco mosaic virus.
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