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What is the purity of a solid sample of aspirin, and does it meet the purity requirements for use in medicines, if it has a melting point range between 134-136°C?
asked
Feb 22
in
Analytical Chemistry
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votes
1
answer
41
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What is the mechanism involved in the catalytic reaction of hydrogenation of ethylene over a platinum catalyst, and how does the morphology and crystallographic orientation of the platinum catalyst affect its activity and selectivity?
asked
Feb 20
in
Surface Chemistry
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1
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34
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How does the incorporation of different dopants affect the electrical conductivity and mechanical flexibility of conductive polymers, and what is the optimal dopant concentration needed to achieve the desired properties for use in flexible electronics?
asked
Feb 20
in
Materials Chemistry
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1
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What is the effect of different solvents on the photochemical properties (fluorescence and excitation spectra) of a fluorescent dye?
asked
Feb 19
in
PhotoChemistry
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1
answer
27
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What is the effect of different photosensitizers on the rate of photochemical reactions?
asked
Feb 19
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PhotoChemistry
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1
answer
33
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How can the design and synthesis of a polymer-based sensor or actuator be optimized for maximum sensitivity and efficiency?
asked
Feb 6
in
Polymer Chemistry
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1
answer
32
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How can small molecule inhibitors target specific immune cells and modulate their activity to treat autoimmune diseases?
asked
Feb 5
in
Medicinal Chemistry
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49
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Consider the reaction A + B ⇌ C + D, which has an equilibrium constant of 2.0 x 10^-3 at a given temperature. Initially, 0.10 mol of A and 0.20 mol of B are placed in a flask. Calculate the equilibrium concentrations of all species in the flask.
asked
Feb 3
in
Chemical equilibrium
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1
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73
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Calculate the surface tension of water at a temperature of 25°C using the capillary rise method, given that the diameter of the capillary tube is 0.8 mm and the rise of water in the tube is 3 cm.
asked
Feb 3
in
Surface Chemistry
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60
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Calculate the standard entropy change for the reaction below at a temperature of 298 K:CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) The standard molar entropies are as follows: S(CH4) = 186.3 J K^-1 mol^-1S(O2) = 205.0 J K^-1 mol^-1S(CO2) = 213.7 J K^-1 mol^-1S(H2O) = 188.8 J K^-1 mol^-1
asked
Feb 3
in
Chemical thermodynamics
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1
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36
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Calculate the equilibrium constant, Kc, at 298 K for the reaction 2 SO2(g) + O2(g) ⇌ 2 SO3(g) when the initial concentrations of SO2, O2, and SO3 are 0.100 M, 0.200 M, and 0.300 M, respectively.
asked
Jan 23
in
Chemical equilibrium
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1
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98
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Who funded Dr. Amanda Biggs' study?
asked
Jan 20
in
Psychology
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1
answer
46
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Where was the first study on ketoconazole Nizoral conducted for anxiety?
asked
Jan 20
in
Psychology
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1
answer
46
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What is the name of the experiment in which participants were placed in a dark room with a small light and reported seeing various images?
asked
Jan 20
in
Psychology
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1
answer
105
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Who is associated with the triarchic theory of intelligence?
asked
Jan 20
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Psychology
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1
answer
52
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According to the evolutionary approach, why do humans have emotions?
asked
Jan 17
in
Psychology
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1
answer
46
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When evaluating theories in existential psychology, what is the importance of evidence?
asked
Jan 16
in
Psychology
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answer
35
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When evaluating the relevance of a theory, what needs to be considered?
asked
Jan 16
in
Psychology
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1
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61
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What is behavioural psychology?
asked
Jan 14
in
Psychology
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1
answer
34
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What is the difference between bipolar disorder and major depressive disorder?
asked
Jan 14
in
Psychology
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