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1
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How do the photochemical properties of dye and pigment molecules affect their performance in coloring materials and their ability to resist fading under different light conditions?
asked
Feb 22
in
PhotoChemistry
0
votes
1
answer
28
views
How does the pH level of acid mine drainage impact the concentration of dissolved heavy metals in water sources downstream?
asked
Feb 22
in
Environmental Chemistry
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votes
1
answer
39
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What is the most effective UV filter substance in commercially available sunscreens, and what is its mechanism of action in protecting the skin from harmful UV radiation?
asked
Feb 21
in
PhotoChemistry
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votes
1
answer
42
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What is the most effective chemical compound for treating chronic obstructive pulmonary disease (COPD) and how can it be synthesized in a cost-effective manner?
asked
Feb 21
in
Medicinal Chemistry
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votes
1
answer
35
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How does the molecular structure of sunscreen agents affect their photochemical properties, and how can this knowledge be used to design more efficient and stable sunscreens that offer optimal UV protection for longer periods of time?
asked
Feb 21
in
PhotoChemistry
0
votes
1
answer
28
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What is the impact of the radioactive waste disposal from nuclear power plants on the surrounding environment and how can it be minimized through effective management practices?
asked
Feb 20
in
Environmental Chemistry
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votes
1
answer
26
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How does the framework topology of a zeolite affect its catalytic properties for the cracking of long-chain alkanes? Use computational methods to analyze and compare the catalytic activity of two different zeolites with different framework topologies.
asked
Feb 20
in
Computational Chemistry
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votes
1
answer
29
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What is the effect of temperature on the conductivity of 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) ionic liquid?
asked
Feb 20
in
Physical Chemistry
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votes
1
answer
32
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How does the coordination chemistry of metalloproteins enable their enzymatic functions, and how can this understanding be applied in the development of new medicines?
asked
Feb 19
in
Coordination Chemistry
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votes
1
answer
84
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What is the coordination geometry and oxidation state of the central metal ion in [Co(en)2Br2]Cl?
asked
Feb 13
in
Coordination Chemistry
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1
answer
70
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What is the effect of changing the magnetic field strength on the chemical shift values in NMR spectroscopy?
asked
Feb 13
in
Physical Chemistry
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votes
1
answer
44
views
How can the efficiency of the conversion process of lignocellulosic biomass to biofuels be improved while minimizing the production of by-products such as furans and organic acids?
asked
Feb 7
in
Chemical engineering
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votes
1
answer
73
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Calculate the standard enthalpy change (in kJ/mol) for the reaction of hydrochloric acid (HCl) and sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water (H2O), given the following balanced chemical equation:HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)Assume the reaction takes place under standard conditions (298 K and 1 atm pressure) and that all solutions have a concentration of 1.0 M. The standard enthalpies of formation for HCl (aq), NaOH (aq), NaCl (aq), and H2O (l) are -92.31 kJ/mol, -469.14 kJ/mol, -407.76 kJ/mol, and -285.83 kJ/mol, respectively.
asked
Feb 3
in
Chemical thermodynamics
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votes
1
answer
128
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What is the effect on the equilibrium position of the H2 + I2 ⇋ 2HI reaction if hydrogen gas is added to the system at constant temperature and pressure, according to Le Chatelier's principle?
asked
Jan 30
in
Chemical reactions
0
votes
1
answer
69
views
How can electrophoresis be used to identify the proteins present in a biological sample and determine their molecular weight?
asked
Jan 29
in
Analytical Chemistry
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1
answer
70
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Calculate the equilibrium constant (K) for the formation of the complex ion [Fe(SCN)₂⁺] when 3.0 x 10⁻³ moles of Fe(NO₃)₃ and 1.5 x 10⁻³ moles of NaSCN are mixed in a 250 mL solution. The solution shows that the concentration of Fe(SCN)₂⁺ is 1.2 x 10⁻³ M at equilibrium.
asked
Jan 23
in
Chemical equilibrium
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votes
1
answer
114
views
When evaluating a theory, what is the criterion for completeness?
asked
Jan 20
in
Psychology
0
votes
1
answer
87
views
According to Richard Lazarus's cognitive appraisal theory, what determines an individual's emotional response to a given situation?
asked
Jan 20
in
Psychology
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1
answer
49
views
According to the false consensus effect, what do people overestimate?
asked
Jan 20
in
Psychology
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votes
1
answer
50
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Why is the attribution theory important to psychology?
asked
Jan 20
in
Psychology
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