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User NinaDimattia
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0
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23
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What is the relationship between the size and shape of nanoparticles and their photochemical properties? Specifically, how does the absorption and emission spectra of gold nanoparticles change as their size and shape are varied?
answered
1 day
ago
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PhotoChemistry
0
votes
19
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What forces or interactions stabilize the secondary protein structure, particularly the alpha-helix and beta-sheet conformations?
answered
1 day
ago
in
BioChemistry
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20
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What is the mechanism of the formation of an ester from a carboxylic acid and an alcohol?
answered
6 days
ago
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Organic Chemistry
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30
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What is the effect of changing the concentration of reactants on the reaction rate and sustainability in the decomposition of hydrogen peroxide catalyzed by potassium iodide?
answered
6 days
ago
in
Chemical kinetics
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votes
18
views
What is the coordination geometry of the [Th(NO3)6]2- complex ion?
answered
6 days
ago
in
Coordination Chemistry
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votes
25
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How does the chemical composition of polymer-based optical materials affect their optical properties such as refractive index, transparency, and fluorescence?
answered
Feb 18
in
Polymer Chemistry
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votes
27
views
How does temperature affect the degradation and stability of polyethylene?
answered
Feb 17
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Polymer Chemistry
0
votes
33
views
How does the excess input of nutrients from human activities cause eutrophication in aquatic ecosystems, and what are the chemical processes involved in this phenomenon?
answered
Feb 13
in
Environmental Chemistry
0
votes
39
views
How can the electrical conductivity of graphene be optimized for use in electronic devices, and what methods can be employed to achieve this?
answered
Feb 7
in
Materials Chemistry
0
votes
30
views
How can the chemical X be purified from impurities A, B, and C using the least possible amount of solvent and equipment?
answered
Feb 6
in
Chemical engineering
0
votes
62
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Does changing the concentration of reactants affect the reaction rate and ultimately, the profitability of the reaction in the synthesis of a particular chemical compound? If so, what is the optimal concentration of reactants that maximizes both the reaction rate and profitability?
answered
Feb 4
in
Chemical kinetics
0
votes
57
views
Determine the heat capacity of a 50-g sample of iron that is heated from 25°C to 100°C using 500 J of heat.
answered
Feb 4
in
Chemical thermodynamics
0
votes
82
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What is the amount of copper in a sample of an unknown compound if 25.0 mL of a 0.050 M EDTA solution is required to titrate a 0.100 g sample of the compound using coulometry?
answered
Jan 30
in
Analytical Chemistry
0
votes
41
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Calculate the lattice energy of sodium chloride (NaCl) using Born-Haber cycle and Hess's law. Given the following data:- Enthalpy of sublimation of sodium (Na): +108.6 kJ/mol- Enthalpy of dissociation of chlorine (Cl2): +243.0 kJ/mol- Bond energy of Na-Cl bond: -412.0 kJ/mol- Ionization energy of sodium (Na): +496.0 kJ/mol- Electron affinity of chlorine (Cl): -349.0 kJ/mol- Heat of formation of sodium chloride (NaCl): -411.0 kJ/mol.
answered
Jan 23
in
Inorganic Chemistry
0
votes
59
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Calculate the corrosion potential of iron (Fe) in a 0.1 M HCl solution at 25°C, given that the standard electrode potential for the Fe2+/Fe redox couple is -0.44 V and the standard hydrogen electrode potential at the same temperature and pressure is 0 V. What is the likelihood of iron corrosion in this environment?
answered
Jan 23
in
ElectroChemistry
0
votes
56
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A student wishes to determine the standard reduction potential of an unknown metal electrode in a half-cell. They set up an electrochemical cell using a known standard hydrogen electrode (SHE) as the reference electrode and the unknown metal electrode as the working electrode. A voltmeter is used to measure the potential difference between the two electrodes. The reading is +0.45 V. What is the standard reduction potential of the unknown metal electrode in volts?
answered
Jan 22
in
Physical Chemistry
0
votes
43
views
Where did the idea of mindfulness-based interventions originate?
answered
Jan 20
in
Psychology
0
votes
33
views
According to the social comparison theory, how do individuals evaluate their own abilities and attitudes?
answered
Jan 17
in
Psychology
0
votes
13
views
What is a false alarm in signal detection theory?
answered
Jan 17
in
Psychology
0
votes
29
views
What is a CBPR partnership?
answered
Jan 17
in
Psychology
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