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How can the mechanical and thermal properties of polymer-based composites be optimized for specific aerospace applications such as aircraft components or spacecraft structures?
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3 days
ago
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Polymer Chemistry
1
answer
26
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Calculate the standard enthalpy change and the standard entropy change for the reaction: 2HCl(g) + Mg(s) → MgCl2(s) + H2(g) Given the following standard enthalpy of formation values: - HCl(g) = -92.31 kJ/mol - MgCl2(s) = -641.8 kJ/mol - H2(g) = 0 kJ/mol - Mg(s) = 0 kJ/mol Also given the following standard molar entropy values:- HCl(g) = 186.9 J/Kmol - MgCl2(s) = 138.53 J/Kmol - H2(g) = 130.7 J/Kmol - Mg(s) = 32.85 J/Kmol
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Feb 3
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Inorganic Chemistry
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54
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What is the dipole moment of carbon dioxide (CO2)? Show your calculations and explain how the molecular geometry and polarity contribute to the overall dipole moment of the molecule.
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Jan 31
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Chemical bonding
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55
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What is the predicted geometry and polarity of the XeF2 molecule based on the VSEPR theory?
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Jan 31
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Inorganic Chemistry
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7
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A cylinder with a volume of 2.5 L contains 1.5 moles of an ideal gas at a pressure of 5 atm. The gas is allowed to expand isothermally against a constant external pressure of 1 atm until the volume doubles. Calculate the work done by the gas during the expansion process.
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Jan 22
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Physical Chemistry
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31
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Why was the intergroup contact theory developed?
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Jan 20
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Psychology
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33
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What is a key factor in resolving intergroup conflict?
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Jan 20
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Psychology
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25
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What are some critiques of behaviourism?
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Jan 17
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Psychology
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18
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What are defense mechanisms?
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Jan 13
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Psychology
1
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62
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What is the just-world hypothesis?
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Jan 10
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Psychology
1
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33
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What are daily changes in the level of ocean water called?
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Jan 2
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Science
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59
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Human actions such as plowing, logging, construction and other actions contribute to what kind of erosion?
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Dec 30, 2024
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Science
1
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30
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Where are about 75% of the tar sands in the world located?
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Dec 28, 2024
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Science
1
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12
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What is the study of the chemical elements necessary for plant growth called?
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Dec 27, 2024
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Science
1
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10
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Overproduction of offspring, combined with limited resources, results in what?
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Dec 27, 2024
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Science
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41
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What does the central cell develop into after double fertilization?
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Dec 27, 2024
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Science
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