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What is the optimum reaction conditions (temperature, pressure, catalyst, etc.) for the synthesis of polystyrene from styrene monomer to yield a maximum percentage yield and molecular weight?
answered
Feb 22
in
Chemical synthesis
0
votes
33
views
How does the molecular structure of a dye or pigment affect its photochemical properties and behavior under different light intensities?
answered
Feb 21
in
PhotoChemistry
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27
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What is the predicted reactivity trend for the halogens (Group 17) in terms of their electronic configuration, and how does this trend relate to their ability to gain electrons?
answered
Feb 20
in
Inorganic Chemistry
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votes
34
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How can the mechanical and thermal properties of different polymers be optimized for their use in 3D printing applications?
answered
Feb 7
in
Materials Chemistry
0
votes
52
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How can the desired mechanical and thermal properties of a polymer material be optimized through controlling the manufacturing process parameters such as temperature, pressure, and cooling rate during polymer processing?
answered
Feb 7
in
Polymer Chemistry
0
votes
35
views
How can chemistry students effectively supplement limited opportunities for hands-on experimentation in order to enhance their understanding of chemical concepts and processes?
answered
Feb 4
in
Chemical education
0
votes
80
views
What is the coordination number of the metal ion in the active site of carbonic anhydrase, given its crystal structure and the ligands present?
answered
Jan 31
in
Coordination Chemistry
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votes
67
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How can the composition and crystalline structure of a mineral sample be determined using X-ray diffraction analysis?
answered
Jan 29
in
Analytical Chemistry
0
votes
79
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Calculate the corrosion current density of a metal M in a 0.5 M H2SO4 solution with a pH of 2.5, where the half-cell potential of the metal M is -0.8V and the standard hydrogen electrode potential is 0V. The temperature of the solution is 25°C and the density of the metal is 7.85 g/cm³.
answered
Jan 23
in
ElectroChemistry
0
votes
71
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Calculate the amount of energy required to completely desorb 2 moles of hydrogen molecules from a metal surface if the enthalpy of desorption for each H2 molecule is 436 kJ/mol.
answered
Jan 23
in
ThermoChemistry
0
votes
127
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A chemistry student needs to calculate the standard enthalpy change for the combustion reaction of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) at 298 K. The student is given the following information: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l) ΔH°rxn = -890.4 kJ/molThe enthalpy of formation of CH4(g) and H2O(l) are -74.8 kJ/mol and -285.8 kJ/mol, respectively. Using this data, what is the standard enthalpy change for the combustion reaction of methane (CH4) to produce carbon dioxide (CO2) and water (H2O) at 298 K?
answered
Jan 22
in
Chemical thermodynamics
0
votes
36
views
What is the impact of attention on social interactions?
answered
Jan 17
in
Psychology
0
votes
46
views
What is the difference between confirmation and disconfirmation in theory evaluation?
answered
Jan 16
in
Psychology
0
votes
43
views
When evaluating social learning theory, what is a major strength of the theory?
answered
Jan 16
in
Psychology
0
votes
74
views
What is spatial release from masking?
answered
Jan 15
in
Psychology
0
votes
58
views
What is the difference between a script and a schema?
answered
Jan 14
in
Psychology
0
votes
51
views
Which gas is responsible for global warming?
answered
Jan 8
in
Science
0
votes
18
views
Which type of substance is considered a proton donor in a reaction?
answered
Jan 8
in
Science
0
votes
82
views
Which element has atomic number 87?
answered
Jan 8
in
Science
0
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42
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What type of seeds come from plants that were traditionally grown in human populations, as opposed to the seeds used for large-scale agricultural production?
answered
Jan 8
in
Science
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