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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
5 days
ago
in
Chemical synthesis
0
votes
26
views
How does the molecular structure of a dye or pigment affect its photochemical properties and behavior under different light intensities?
answered
6 days
ago
in
PhotoChemistry
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votes
19
views
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
28
views
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
48
views
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
32
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
63
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
0
votes
60
views
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
61
views
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
55
views
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
105
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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
29
views
What is the impact of attention on social interactions?
answered
Jan 17
in
Psychology
0
votes
24
views
What is the difference between confirmation and disconfirmation in theory evaluation?
answered
Jan 16
in
Psychology
0
votes
34
views
When evaluating social learning theory, what is a major strength of the theory?
answered
Jan 16
in
Psychology
0
votes
47
views
What is spatial release from masking?
answered
Jan 15
in
Psychology
0
votes
43
views
What is the difference between a script and a schema?
answered
Jan 14
in
Psychology
0
votes
29
views
Which gas is responsible for global warming?
answered
Jan 8
in
Science
0
votes
14
views
Which type of substance is considered a proton donor in a reaction?
answered
Jan 8
in
Science
0
votes
61
views
Which element has atomic number 87?
answered
Jan 8
in
Science
0
votes
35
views
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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