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28
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How does the photochemical behavior of supramolecular assemblies differ from that of individual molecules, and what factors influence this difference?
answered
5 days
ago
in
PhotoChemistry
0
votes
29
views
What is the most efficient solvent extraction method to recover valuable metals such as gold and silver from electronic waste using a continuous-flow system?
answered
6 days
ago
in
Chemical engineering
0
votes
27
views
How does the molecular structure of a polymer affect its mechanical properties for use in biomedical applications, and how can we optimize these properties for specific medical devices or applications such as implants or drug delivery systems?
answered
6 days
ago
in
Materials Chemistry
0
votes
25
views
What are the factors that influence the luminescence properties of luminescent materials under different conditions of photo-excitation?
answered
Feb 20
in
PhotoChemistry
0
votes
30
views
What is the effect of the concentration of a solution on the chemical shift in magnetic resonance spectroscopy? Provide experimental evidence and explain the underlying physical principles.
answered
Feb 18
in
Physical Chemistry
0
votes
35
views
How does the excess input of nutrients from human activities cause eutrophication in aquatic ecosystems, and what are the chemical processes involved in this phenomenon?
answered
Feb 13
in
Environmental Chemistry
0
votes
38
views
What is the role of cobalt in the active site of vitamin B12, a metalloenzyme? How does the coordination chemistry of cobalt in vitamin B12 allow it to facilitate the various enzymatic reactions it is involved in?
answered
Feb 12
in
Coordination Chemistry
0
votes
37
views
How can the stability of polymers be increased or improved to prevent degradation?
answered
Feb 10
in
Polymer Chemistry
0
votes
35
views
How can the molecular weight of polyethylene be controlled during its synthesis from ethylene monomer, and how does this impact the final properties of the polyethylene product?
answered
Feb 10
in
Chemical synthesis
0
votes
44
views
How can the durability and scratch resistance of polymer-based coatings be improved, while maintaining their transparency?
answered
Feb 7
in
Polymer Chemistry
0
votes
40
views
How can chemical modifications be made to existing drugs to improve their efficacy in treating gastrointestinal diseases such as inflammatory bowel disease and gastroesophageal reflux disease?
answered
Feb 4
in
Medicinal Chemistry
0
votes
47
views
Determine the formal charge on the sulfur atom in sulfur hexafluoride (SF6)?
answered
Feb 4
in
Inorganic Chemistry
0
votes
51
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Calculate the standard enthalpy of formation of aluminum oxide from its elements given the following information:2 Al(s) + 3/2 O2(g) → Al2O3(s) ΔH°rxn = - 1675.7 kJ/molStandard enthalpy of formation of Al(s) = 0 kJ/molStandard enthalpy of formation of O2(g) = 0 kJ/mol
answered
Feb 3
in
ThermoChemistry
0
votes
31
views
What is the calculated bandgap of a silicon crystal using Density Functional Theory (DFT) calculations, with a lattice parameter of 5.43 Å? How does the calculated bandgap compare to experimental values reported in the literature?
answered
Jan 31
in
Computational Chemistry
0
votes
93
views
What are the three components that make up a nucleotide? How does the structure of a nucleotide relate to its function in the formation of nucleic acids such as DNA and RNA?
answered
Jan 30
in
BioChemistry
0
votes
84
views
What steps can be taken to maximize the chances of getting a chemistry-related internship or job opportunity given the limited availability in the industry?
answered
Jan 30
in
Chemical education
0
votes
70
views
How can you determine the concentration of copper ions in a given sample of solution using spectrophotometry?
answered
Jan 30
in
Analytical Chemistry
0
votes
49
views
Calculate the enthalpy of ionization of hydrogen gas (H₂) given that it requires 1312 kJ/mol to ionize a single hydrogen atom (H) in the gas phase.
answered
Jan 23
in
ThermoChemistry
0
votes
65
views
Calculate the enthalpy change for the following reaction, using Hess's Law:2H2S(g) + 3O2(g) → 2H2O(l) + 2SO2(g)Given the following enthalpy changes: 2H2(g) + O2(g) → 2H2O(l) ΔH1 = -484 kJ2SO2(g) + O2(g) → 2SO3(g) ΔH2 = -198 kJ2H2(g) + S(s) → H2S(g) ΔH3 = +25kJ
answered
Jan 23
in
Chemical reactions
0
votes
53
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Calculate the enthalpy change for dissolving 10 grams of potassium chloride (KCl) in 200 mL of water, assuming the temperature remains constant at 25°C. The molar mass of KCl is 74.5513 g/mol and the specific heat capacity of water is 4.184 J/g·°C.
answered
Jan 23
in
ThermoChemistry
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