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0
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1
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18
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How does the size and shape of a gold nanoparticle affect its stability and reactivity in a molecular dynamics simulation?
asked
1 day
ago
in
Computational Chemistry
0
votes
1
answer
23
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What is the maximum adsorption capacity of nitrogen gas on a certain adsorbent material at a temperature of 25°C and a pressure of 5 atm, based on the Langmuir adsorption isotherm with a constant K of 0.2 L/mol?
asked
5 days
ago
in
Surface Chemistry
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votes
1
answer
19
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What is the effect of nanoparticle size on the mechanical properties of polymer nanocomposites?
asked
6 days
ago
in
Polymer Chemistry
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1
answer
26
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How does the chemical composition and structure of polymer-based packaging materials affect their biodegradability and environmental impact?
asked
Feb 18
in
Polymer Chemistry
0
votes
1
answer
24
views
What is the balanced chemical equation for the neutralization reaction between hydrochloric acid and sodium hydroxide?
asked
Feb 17
in
Chemical reactions
0
votes
1
answer
36
views
What is the oxidation state of sulfur in the compound Na2SO4?
asked
Feb 13
in
ElectroChemistry
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1
answer
45
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What is the hybridization of the central atom in the molecule SF6 (sulfur hexafluoride)?
asked
Feb 13
in
Inorganic Chemistry
0
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1
answer
36
views
How effective are environmental regulations in preventing or reducing pollution of water bodies in the United States?
asked
Feb 13
in
Environmental Chemistry
0
votes
1
answer
35
views
How do chaperones aid in the folding process of proteins and what are the consequences of misfolded proteins in the human body?
asked
Feb 12
in
BioChemistry
0
votes
1
answer
36
views
How can the bandgap of a semiconductor be calculated and manipulated for optimal performance in electronic devices?
asked
Feb 6
in
Materials Chemistry
0
votes
1
answer
28
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How can computational chemistry and molecular modeling be used to predict the potential energy surface for a chemical reaction and determine the corresponding reaction mechanism?
asked
Feb 5
in
Physical Chemistry
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1
answer
52
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Design a chemical reactor to produce 500kg of ammonia per hour from hydrogen and nitrogen gases. You are given the rate equation for the reaction as follow: N2(g) + 3H2(g) → 2NH3(g) The reaction is exothermic and a temperature range of 400-500°C is recommended for optimal production rate. The pressure of the system should be between 150-200 atm. You are required to determine the required size of the reactor and the flow rates of hydrogen and nitrogen gas.
asked
Feb 3
in
Chemical engineering
0
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1
answer
65
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Calculate the standard enthalpy change (∆H°) and standard entropy change (∆S°) for the reaction between solid aluminum and gaseous oxygen to form solid aluminum oxide, given the following balanced chemical equation:4Al(s) + 3O2(g) → 2Al2O3(s) The standard enthalpies of formation of Al(s), O2(g), and Al2O3(s) are -394.4 kJ/mol, 0 kJ/mol, and -1675.7 kJ/mol, respectively. The standard entropy change for the reaction of O2(g) to form Al2O3(s) is -159.6 J/K·mol.
asked
Feb 3
in
Inorganic Chemistry
0
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1
answer
58
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What is the concentration of iron (Fe) in a sample of river water using spectrophotometric analysis with a known calibration curve and absorbance of 0.25 at a wavelength of 510 nm? The molar absorptivity of Fe at 510 nm is 8.70 x 10^3 M^-1cm^-1 and the path length of the cuvette used is 1.0 cm.
asked
Jan 30
in
Analytical Chemistry
0
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1
answer
71
views
What is the concentration of copper ions in a water sample obtained from an abandoned mine using polarographic analysis?
asked
Jan 30
in
Analytical Chemistry
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1
answer
62
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A chemistry student needs to analyze a water sample to determine the concentration of a certain contaminant. The student knows the initial concentration of the contaminant in the source water and the volume of the source water used to produce the final sample. Can the student use mass balance calculations to determine the concentration of the contaminant in the final water sample? If so, what is the concentration of the contaminant in the final sample?
asked
Jan 22
in
Analytical Chemistry
0
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1
answer
30
views
What is the pre-contemplation stage?
asked
Jan 20
in
Psychology
0
votes
1
answer
32
views
Who developed the Iowa Gambling Task?
asked
Jan 20
in
Psychology
0
votes
1
answer
27
views
Please evaluate the arousal theory of motivation.
asked
Jan 20
in
Psychology
0
votes
1
answer
31
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Where did the concept of the unconscious mind originate?
asked
Jan 20
in
Psychology
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