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Questions by Steffen8339
0
votes
1
answer
14
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How does the selectivity of oxidation of hydrocarbons on metal surfaces change when the size of the metal nanoparticles is varied?
asked
1 day
ago
in
Surface Chemistry
0
votes
1
answer
19
views
How does the reaction rate of a chemical reaction affect its safety?
asked
3 days
ago
in
Chemical kinetics
0
votes
1
answer
22
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What are the optimal reaction conditions (temperature, pressure, and concentration) required for the preparation of 2,4-dichloronitrobenzene from nitrobenzene and chlorine gas, and how do these conditions affect the yield of the reaction?
asked
3 days
ago
in
Chemical synthesis
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votes
1
answer
21
views
How does the molecular weight of a polymer affect its rheological properties when it is in a molten state?
asked
4 days
ago
in
Polymer Chemistry
0
votes
1
answer
27
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What is the pH of a 0.1 M solution of hydrochloric acid (HCl)? Given the ionization constant of HCl is 1.3 × 10^-6.
asked
5 days
ago
in
Inorganic Chemistry
0
votes
1
answer
24
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What is the effect of different solvents (methanol, ethanol, and water) on the fluorescence emission of luminescent materials?
asked
6 days
ago
in
PhotoChemistry
0
votes
1
answer
31
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What is the critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS) at a temperature of 25°C in water? How does the CMC vary with temperature? Also, explain the formation of micelles and their role in soap solutions.
asked
6 days
ago
in
Surface Chemistry
0
votes
1
answer
37
views
How does the binding of a transcription factor to DNA affect gene expression? Please provide a detailed explanation of the biochemical processes involved and any relevant examples.
asked
Feb 17
in
BioChemistry
0
votes
1
answer
21
views
What is the balanced chemical equation for the preparation of 2,4-dichloronitrobenzene from nitrobenzene and chlorine gas, and how much of each reagent is required to produce 10 grams of the final product?
asked
Feb 17
in
Chemical synthesis
0
votes
1
answer
14
views
What is the balanced chemical equation for the combustion of propane (C3H8)?
asked
Feb 17
in
Chemical reactions
0
votes
1
answer
35
views
What is the predicted boiling point of a compound with a molecular weight of 100 g/mol and only London dispersion forces as the predominant intermolecular force?
asked
Feb 14
in
Chemical bonding
0
votes
1
answer
24
views
How can we predict the catalytic activity and selectivity of a given catalyst using quantum chemistry calculations?
asked
Feb 14
in
Quantum Chemistry
0
votes
1
answer
42
views
What are the major air pollutants that can harm human health, and how can their concentration be measured and minimized in urban areas?
asked
Feb 13
in
Environmental Chemistry
0
votes
1
answer
41
views
How does the density functional theory predict the electronic transport properties of a given material and what factors influence the conductivity of the material?
asked
Feb 12
in
Computational Chemistry
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votes
1
answer
40
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Calculate the standard enthalpy change for the reaction between calcium oxide (CaO) and water (H2O) to form calcium hydroxide (Ca(OH)2), given that all species are in their standard state and that the balanced chemical equation is:CaO(s) + H2O(l) → Ca(OH)2(s)The standard enthalpies of formation of CaO(s), H2O(l) and Ca(OH)2(s) are -635.1 kJ/mol, -285.8 kJ/mol, and -986.2 kJ/mol respectively.
asked
Feb 3
in
Chemical thermodynamics
0
votes
1
answer
43
views
Calculate the standard enthalpy change for the neutralization of 50.0 mL of 0.100 M hydrochloric acid with 50.0 mL of 0.100 M sodium hydroxide, assuming that the specific heat capacity of the resulting solution is 4.18 J/g °C and the density of the solution is 1.00 g/mL.
asked
Feb 3
in
Chemical thermodynamics
0
votes
1
answer
71
views
How can chemistry students work with school administrators and local government officials to advocate for increased funding for chemistry education and resources? What specific steps and arguments can be made to demonstrate the importance of chemistry education in preparing students for future careers and contributing to scientific advancement?
asked
Jan 30
in
Chemical education
0
votes
1
answer
58
views
Calculate the lattice energy of magnesium oxide (MgO) given that the magnesium ion has a charge of +2 and the oxide ion has a charge of -2. The lattice energy can be calculated using the Born-Haber cycle and the following data:- The enthalpy of sublimation of magnesium (Mg) is 147 kJ/mol- The first ionization energy of magnesium is 738 kJ/mol- The enthalpy of formation of MgO is -601 kJ/mol- The electron affinity of oxygen is -141 kJ/mol- The enthalpy of dissociation of oxygen molecules is 498 kJ/mol.
asked
Jan 23
in
Inorganic Chemistry
0
votes
1
answer
11
views
Calculate the anodic Tafel slope for a reaction with an exchange current density of 2x10^-4 A cm^-2 if the current density at an anodic potential of 0.1V vs the standard hydrogen electrode (SHE) is 0.5 mA cm^-2 and at 0.2V vs SHE is 2.0 mA cm^-2. Assume a linear relationship between current density and overpotential.
asked
Jan 23
in
ElectroChemistry
+1
vote
1
answer
11
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How can we use the knowledge of the chemical makeup of different viruses to design drugs that target their specific characteristics and prevent infection?
asked
Jan 22
in
Medicinal Chemistry
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