Domanda del libro di testo
Two compounds (labeled I and II) have a liquid crystal state. Predict which compound has a higher temperature associ- ated with the solid to liquid crystal phase change. Explain your reasoning.
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Ch.11 - Liquids & Phase Changes
McMurry8th EditionChemistryISBN: 9781292336145
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TOC.tableOfContents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Capitolo 11, Problema 70
Intermolecular forces are important in creating ordered arrangements in liquid crystals. What types of intermolecu- lar forces exist in a sample of the following compound? 
Guida verificata passo dopo passo1
Identify the functional groups present in the compound. In this case, the compound has a benzene ring with a methoxy group (-OCH3), an amino group (-NH2), and a carboxylic acid group (-COOH).
Determine the types of intermolecular forces each functional group can participate in. The methoxy group can engage in dipole-dipole interactions and London dispersion forces. The amino group can participate in hydrogen bonding, dipole-dipole interactions, and London dispersion forces. The carboxylic acid group can engage in hydrogen bonding, dipole-dipole interactions, and London dispersion forces.
Consider the overall structure of the molecule and how these functional groups might interact with each other and with other molecules. The benzene ring can participate in π-π interactions, which are a type of London dispersion force.
Summarize the types of intermolecular forces present in the compound. These include hydrogen bonding (from the -NH2 and -COOH groups), dipole-dipole interactions (from the -OCH3, -NH2, and -COOH groups), London dispersion forces (from the entire molecule, including the benzene ring), and π-π interactions (from the benzene ring).
Conclude that the compound exhibits a combination of hydrogen bonding, dipole-dipole interactions, London dispersion forces, and π-π interactions, which contribute to the ordered arrangements in liquid crystals.
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Intermolecular Forces
Intermolecular forces are the attractive forces between molecules that influence physical properties such as boiling and melting points. The main types include hydrogen bonding, dipole-dipole interactions, and London dispersion forces. Understanding these forces is crucial for analyzing the behavior of substances, particularly in states of matter like liquids and solids.
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Percorso guidato
01:59
Intermolecular vs Intramolecular Forces
Hydrogen Bonding
Hydrogen bonding is a strong type of dipole-dipole interaction that occurs when hydrogen is covalently bonded to highly electronegative atoms like oxygen, nitrogen, or fluorine. In the compound shown, the presence of the -COOH (carboxylic acid) and -NH2 (amine) groups allows for significant hydrogen bonding, which contributes to the compound's solubility and structural properties in liquid crystals.
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Percorso guidato
01:22Hydrogenation Reactions
Liquid Crystals
Liquid crystals are materials that exhibit properties between those of liquids and solid crystals. They have ordered molecular arrangements that can change in response to temperature or electric fields. The intermolecular forces present in liquid crystals, such as hydrogen bonding and van der Waals forces, play a critical role in maintaining their unique phases and behaviors, making them essential in applications like displays and sensors.
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Percorso guidato
03:04The crystal field splitting pattern for octahedral complexes has the d orbitals on or along the axes as having the higher energy.
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Domanda del libro di testo
The chlorofluorocarbon refrigerant trichlorofluoromethane, CCl3F, has Pvap = 100.0 mm Hg at -23 °C and ΔHvap
= 24.77 kJ>mol.
(b) What is ΔSvap for trichlorofluoromethane?
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Domanda del libro di testo
Benzene has a melting point of 5.53 °C and a boiling point of 80.09 °C at atmospheric pressure. Its density is0.8787 g>cm3 when liquid and 0.899 g>cm3 when solid; it has Tc = 289.01 °C, Pc = 48.34 atm, Tt = 5.52 °C, and Pt = 0.0473 atm. Starting from a point at 200 K and
66.5 atm, trace the following path on a phase diagram. (1) First, increase T to 585 K while keeping P constant.
(2) Next, decrease P to 38.5 atm while keeping T constant.
(3) Then, decrease T to 278.66 K while keeping P constant.
(4) Finally, decrease P to 0.0025 atm while keeping T
constant.
What is your starting phase, and what is your final phase?
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Domanda del libro di testo
The compound cholesteryl benzoate is a rod-like molecule that undergoes a phase change from the solid to the liq- uid crystal phase at 145.5 °C. When cholesteryl benzoate is mixed with cholesteryl oleyl carbonate, a molecule with a curved shape, the temperature of the solid to liquid crys- tal transition changes. Predict if the transition temperature increases or decreases and explain your reasoning.
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