Interpretation:
Whether temperature increases or decreases in phase transition when cholesteryl benzoate is mixed with chloelsteryl oleyl carbonate should be determined.
Concept introduction:
Liquid crystals are defined as a phase in which substance exhibits properties of both liquids and solids. Liquid crystal flow like liquid but their arrangement of molecule as well as intermolecular forces is like solid.
Liquid crystal molecules are made up of six-membered rings with on terminal polar group, a linkage group and a side chain of carbon atoms. Each carbon atom in liquid crystal molecules has trigonal planar geometry.
The molecules are rigid. The rigidity is increased due to presence of double-bonded linkage groups such as
The terminal polar groups exhibit strong intermolecular forces such as strong dipole-dipole interaction or dipole−induced dipole interaction and hydrogen bond.
Types of liquid crystal are as follows:
- Nematic Liquid crystal.
- Smectic Liquid crystal.
1. Nematic Liquid crystal: The molecules in the nematic phase are in same direction and can move around freely very much like that of liquid. In this, the axis is parallel but the ends are not aligned.
2. Smectic Liquid crystal: The molecules in the smectic phase are perpendicular to the plane and are aligned in layers. In these, long axis is parallel and also their ends are aligned.
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CHEMISTRY-TEXT
- A chemistry student is given 250. mL of a clear aqueous solution at 44.° C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 28.° C. At that point, the student sees that a precipitate has formed. He transfers the liquid to a clean new beaker and throws away the precipitate. The student then evaporates the water from the liquid in the new beaker under vacuum. It weighs 2.0 g. Using only the information above, can you calculate the solubility of Xin water at 28.° C ? If you said yes, calculate it. Be sure your answer has a unit symbol and the right number of significant digits. I Don't Know T Submit 8.0 888 O yes O no 0 0.0 X H 010 « 7² 4 S © 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy DII ? A olo Ar Privacy Center | Accessibility Centerarrow_forwardThe normal boiling point of cyclohexane is 81 °C. What's the vapor pressure of cyclohexane at 81 °C?arrow_forwardSulfur does not dissolve in water, but it does dissolve in carbon disulfide; potassium nitrate does not dissolve in carbon disulfide, but does in water; and carbon does not dissolve in either of these liquids. using the above data, outline a process for separating these three components of gunpowder.arrow_forward
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- Introductory Chemistry: A FoundationChemistryISBN:9781337399425Author:Steven S. Zumdahl, Donald J. DeCostePublisher:Cengage Learning