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What is the optimal reaction conditions (temperature, pressure, concentration) for the preparation of 2,4,6-trinitrotoluene from toluene and nitric acid, and what is the yield of the reaction under these conditions?
answered
Feb 22
in
Chemical synthesis
0
votes
49
views
How does the arrangement and structure of supramolecular assemblies affect their photochemical properties? Provide examples of supramolecular assemblies and their corresponding photochemical properties.
answered
Feb 17
in
PhotoChemistry
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32
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How does surface modification of nanoparticles affect their catalytic activity in a specific chemical reaction?
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Feb 17
in
Surface Chemistry
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35
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What factors affect the rate of inorganic reactions and how can they be manipulated to increase or decrease the rate of the reaction?
answered
Feb 14
in
Inorganic Chemistry
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votes
36
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How does prolonged exposure to high levels of air pollutant particles, such as PM2.5, affect the human respiratory system and overall health?
answered
Feb 14
in
Environmental Chemistry
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votes
44
views
How can the yield and purity of a pharmaceutical drug be optimized in the process of its production using chemical engineering principles and techniques?
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Feb 14
in
Chemical engineering
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votes
40
views
How can the presence of heavy metal contaminants in soil affect the growth and quality of crops, and what techniques can be used to remediate the contaminated soil in order to minimize their negative impact on agriculture?
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Feb 10
in
Environmental Chemistry
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votes
38
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How can the electrical conductivity and stability of graphene be improved for practical application in electronic devices?
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Feb 7
in
Materials Chemistry
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votes
62
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Design a heat exchanger for a specific process involving the heating of ethanol from 20°C to 80°C. The process flow rate of ethanol is 200 L/hr, and the heating medium is water available at 90°C with a flow rate of 500 L/hr. The heat transfer coefficient for the heat exchanger is 1000 W/m²K. Determine the surface area required for the heat exchanger to achieve the desired heating of ethanol using the given data.
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Feb 4
in
Chemical engineering
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111
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What is the rate constant for non-radiative deactivation of the excited state of a given small organic molecule, as determined by ab initio calculations?
answered
Jan 31
in
Computational Chemistry
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69
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Calculate the enthalpy change for the combustion of 1 mole of methane (CH4) gas given that the standard enthalpy of formation of methane is -74.8 kJ/mol, and the standard enthalpies of formation for carbon dioxide (CO2) and water (H2O) are -393.5 kJ/mol and -241.8 kJ/mol respectively. The balanced chemical equation for the reaction is:CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l)
answered
Jan 23
in
Chemical thermodynamics
0
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39
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A student is designing an electrochemical cell using zinc and copper electrodes. The student wants to know the current density (in A/cm²) when the cell operates at a voltage of 1.5 V and a temperature of 25°C. The area of the zinc electrode is 10 cm², and the area of the copper electrode is 5 cm². Assuming a 2:1 ratio for the transfer of electrons between the two electrodes, calculate the current density in the cell.
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Jan 22
in
ElectroChemistry
0
votes
78
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How does increasing the temperature affect the rate of reaction between sodium thiosulfate and hydrochloric acid?
answered
Jan 22
in
Chemical kinetics
0
votes
59
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What is the solubility of calcium sulfate in water at 25°C, given its Ksp value of 4.93 × 10^-5?
answered
Jan 21
in
Inorganic Chemistry
0
votes
132
views
How can positive psychology interventions benefit individuals?
answered
Jan 20
in
Psychology
0
votes
38
views
What is blinding?
answered
Jan 16
in
Psychology
0
votes
65
views
What is the criterion of accuracy in theory evaluation?
answered
Jan 16
in
Psychology
0
votes
62
views
How does the attachment theory explain the development of eating disorders?
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Jan 16
in
Psychology
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45
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According to Ellis, what is the goal of cognitive-behavioural therapy?
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Jan 15
in
Psychology
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75
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What is the developmental niche?
answered
Jan 15
in
Psychology
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