Recent activity by Maura45O7086

1 answer 18 views

What is the relationship between Zeta potential and the stability of colloidal suspensions? How can Zeta potential be measured and manipulated to control the stability of colloidal suspensions?

asked 1 day ago in Surface Chemistry

1 answer 13 views

What is the optimal reaction conditions (temperature, pressure, concentration) for the preparation of 2,4,6-trinitrotoluene from toluene and nitric acid, and what is the yield of the reaction under these conditions?

answered 3 days ago in Chemical synthesis

1 answer 22 views

What are the optimal reaction conditions for synthesizing polyurethane from diisocyanate and polyol, such that a high molecular weight and desirable material properties are achieved?

answered 3 days ago in Chemical synthesis

1 answer 15 views

What is the change in the formation constant of a complex ion when the concentration of the ligand is increased by a factor of 10 and the concentration of the metal ion remains constant?

asked 5 days ago in Chemical equilibrium

1 answer 20 views

What is the effect of the structural modifications on the fluorescence properties of a specific dye molecule investigated in the literature of photochemistry of fluorescent dyes?

answered 5 days ago in PhotoChemistry

1 answer 22 views

What is the effect of different metal ion geometries on the formation and properties of coordination polymers and metal-organic frameworks? Provide specific examples and discuss their potential applications in catalysis or gas storage.

asked 5 days ago in Coordination Chemistry

1 answer 31 views

How does the choice of polymer type and 3D printing parameters (e.g., temperature, speed, layer thickness) affect the mechanical properties (e.g., strength, flexibility) of the printed object?

answered 6 days ago in Polymer Chemistry

1 answer 24 views

How does the choice of catalytic material and reaction conditions affect the conversion efficiency and selectivity of a heterogeneous catalyst for a specific chemical reaction?

asked 6 days ago in Surface Chemistry

1 answer 25 views

What is the balanced chemical equation for the double replacement reaction that occurs between lead(II) nitrate and potassium iodide?

asked Feb 17 in Chemical reactions

1 answer 25 views

What are the key molecular targets for developing new treatments for hypertension and what are the different strategies that medicinal chemists can use to design effective drugs that target these molecular targets?

asked Feb 13 in Medicinal Chemistry

1 answer 44 views

How can we develop a green synthesis method for producing metal nanoparticles that avoids the use of toxic chemicals and maintains the properties of the nanoparticles for diverse applications in materials chemistry?

asked Feb 12 in Materials Chemistry

1 answer 33 views

How can the photochemical properties of luminescent materials be optimized to enhance their efficiency in light-emitting devices?

answered Feb 10 in PhotoChemistry

1 answer 43 views

How can the adsorption of proteins on solid surfaces be controlled and optimized for maximum efficiency in applications such as drug delivery and biomaterials?

asked Feb 6 in Surface Chemistry

1 answer 32 views

How can chemistry students overcome the challenges of insufficient funding for chemistry education in their institutions?

answered Feb 5 in Chemical education

1 answer 39 views

Calculate the standard enthalpy change for the complete combustion of 2 moles of methane gas under standard conditions, where all reactants and products are in their standard states. The balanced chemical equation for the combustion of methane is CH4(g) + 2O2(g) → CO2(g) + 2H2O(l), and the standard enthalpy of formation ΔH°f for methane, carbon dioxide, and water are -74.8 kJ/mol, -393.5 kJ/mol, and -285.8 kJ/mol, respectively.

answered Feb 3 in Chemical thermodynamics

1 answer 110 views

How does the pH of acid mine drainage impact the solubility of toxic metals into surface water and what methods can be used to neutralize the acidity and prevent contamination of surrounding water sources?

asked Jan 30 in Environmental Chemistry

1 answer 40 views

Calculate the molar mass of barium nitrate (Ba(NO3)2).

answered Jan 23 in Inorganic Chemistry

1 answer 69 views

Calculate the Gibbs free energy change for the combustion of methane gas to produce carbon dioxide and water vapor at a temperature of 298K and a pressure of 1 atm, given the equation:CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g) ΔG°f = -394.36 kJ/mol (CO2); ΔG°f = -237.13 kJ/mol (H2O); ΔG°f = -50.8 kJ/mol (CH4); ΔG°f = 0 kJ/mol (O2)

answered Jan 23 in Chemical thermodynamics

1 answer 46 views

Calculate the Gibbs free energy change (ΔG) for the following chemical reaction at 25°C and constant pressure of 1 atm:2H2(g) + O2(g) → 2H2O(l)Given the following standard Gibbs free energy of formation values (ΔfG°) at 25°C:H2(g) = 0 kJ/molO2(g) = 0 kJ/molH2O(l) = -237 kJ/mol

asked Jan 23 in Chemical thermodynamics

1 answer 72 views

Calculate the enthalpy of polymerization for the reaction of ethylene (C2H4) to polyethylene (C2H4)n, given that the enthalpy of combustion for ethylene is -1411 kJ/mol and the number of moles of ethylene used in the reaction is 4.5 mol. Assume that the reaction is exothermic and that the enthalpy change is constant over the extent of the reaction.

asked Jan 23 in ThermoChemistry

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