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What are the specific steps involved in the preparation of p-nitroaniline from aniline and nitric acid, and what are the optimal reaction conditions required to obtain a high yield of the desired product?
answered
Feb 22
in
Chemical synthesis
0
votes
37
views
What is the most efficient way of synthesizing graphene oxide-based nanocomposites for use in water purification and how do the physical and chemical characteristics of the resulting material affect its performance?
answered
Feb 21
in
Materials Chemistry
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votes
30
views
What is the effect of different solvents on the photochemical properties (fluorescence and excitation spectra) of a fluorescent dye?
answered
Feb 19
in
PhotoChemistry
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votes
31
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What is the bond enthalpy of the carbon-carbon double bond in ethene (C2H4) if it requires 615 kJ/mol of energy to break the bond?
answered
Feb 18
in
Chemical bonding
0
votes
40
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How does plasma treatment affect the surface properties and wettability of biomaterials used in medical implant devices?
answered
Feb 14
in
Surface Chemistry
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votes
35
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What is the effect of metal substitution on the electrochemical and spectroscopic properties of metalloporphyrins and metallophthalocyanines? Provide examples and explain the trends observed.
answered
Feb 13
in
Coordination Chemistry
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votes
37
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How can the insufficient emphasis on practical applications of chemistry in the classroom be addressed to better prepare students for real-world applications in the field of chemistry?
answered
Feb 7
in
Chemical education
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votes
83
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Determine the standard enthalpy change for the precipitation reaction of 10.0 g of calcium chloride (CaCl2) with excess sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3) and sodium chloride (NaCl). Given the following standard enthalpies of formation: ΔHf°(CaCl2) = -795.8 kJ/mol, ΔHf°(Na2CO3) = -1130.1 kJ/mol, ΔHf°(CaCO3) = -1206.9 kJ/mol, and ΔHf°(NaCl) = -411.2 kJ/mol.
answered
Feb 4
in
Chemical thermodynamics
0
votes
47
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How does the acetylation of histone proteins affect the binding of transcription factors to DNA, and what role does this play in regulating gene expression?
answered
Jan 30
in
BioChemistry
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50
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How can the practical applications of chemistry, such as developing new drugs or creating sustainable energy sources, be highlighted more effectively in chemistry education to motivate students to pursue careers in these areas?
answered
Jan 30
in
Chemical education
0
votes
139
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A student needs to calculate the current density (in Amperes per square meter) of a copper electrode (Area = 10 cm²) in an electrochemical cell where the half-cell reaction is Cu²⁺ + 2e⁻ → Cu and the cell voltage is 1.1 V. The concentration of Cu²⁺ in the cell is 0.1 M.
answered
Jan 22
in
ElectroChemistry
0
votes
90
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Please compare the trait and biological theories of personality.
answered
Jan 20
in
Psychology
0
votes
36
views
How did Pavlov's dog experiment demonstrate classical conditioning?
answered
Jan 20
in
Psychology
0
votes
60
views
According to falsifiability, what must scientific theories be?
answered
Jan 15
in
Psychology
0
votes
70
views
What is the purpose of the superego in psychoanalytic theory?
answered
Jan 14
in
Psychology
0
votes
39
views
What is the key argument of Carol Gilligan's theory of moral development?
answered
Jan 14
in
Psychology
0
votes
130
views
What is the nurture vs. nature debate in psychology?
answered
Jan 13
in
Psychology
0
votes
67
views
What type of reproduction results in genetically unique offspring?
answered
Jan 8
in
Science
0
votes
79
views
What type of radio waves exist in the 540 to 1600 khz frequency range?
answered
Jan 8
in
Science
0
votes
87
views
What occurs when two nonpolar liquids are mixed?
answered
Jan 7
in
Science
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