Recent activity by StuartCarson

1 answer 27 views

How does the presence of electron-donor or electron-acceptor groups in a photovoltaic material affect its photochemical properties, specifically its efficiency in converting light energy to electrical energy?

asked 3 days ago in PhotoChemistry

1 answer 16 views

What is the most efficient and eco-friendly method for synthesizing metal nanoparticles with a narrow size distribution and high stability, and how does the synthesis route affect the physical and chemical properties of the resulting nanoparticles?

asked 4 days ago in Materials Chemistry

1 answer 6 views

What is the most effective analytical method to determine pesticide residues in food samples and how do these residues affect human health over a long period of time?

answered 4 days ago in Environmental Chemistry

1 answer 32 views

How does the increase in the concentration of greenhouse gases such as CO2 affect the global temperature? Provide an explanation for the chemical mechanism behind this phenomenon and suggest potential solutions to reduce greenhouse gas emissions.

asked 5 days ago in Environmental Chemistry

1 answer 14 views

What mass of NaOH (in grams) is needed to react completely with 25.0 g of HCl according to the following balanced chemical equation?2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l)

answered 5 days ago in Chemical reactions

1 answer 23 views

What is the mechanism of the catalytic reaction between hydrogen and carbon monoxide on a platinum surface in the Fischer-Tropsch process?

asked 5 days ago in Surface Chemistry

1 answer 20 views

What is the bond enthalpy of the H-H bond in the H2 molecule?

asked Feb 18 in Chemical bonding

1 answer 30 views

How can we optimize the process parameters of the production of a specific pharmaceutical drug to achieve the highest yield and purity while minimizing cost and waste?

asked Feb 14 in Chemical engineering

1 answer 37 views

What are the different types of liquid crystals and how do their physical properties vary from each other?

answered Feb 13 in Physical Chemistry

1 answer 32 views

What is the effect of increasing the pH of a solution containing the redox system, Fe2+/ Fe3+ on the equilibrium concentration of Fe2+ at 25°C?

answered Feb 13 in Chemical equilibrium

1 answer 41 views

How can the synthesis of metal-organic frameworks be optimized to increase the yield and purity of the final product?

asked Feb 11 in Materials Chemistry

1 answer 8 views

How can the production of a specific cosmetic product be optimized through the design of a chemical engineering system, while ensuring that the product meets all necessary quality and safety standards?

asked Feb 10 in Chemical engineering

1 answer 35 views

How can limited opportunities for hands-on experimentation in chemistry affect a student's overall understanding and appreciation of the subject?

answered Feb 5 in Chemical education

1 answer 43 views

Calculate the standard enthalpy change for the precipitation reaction of 50.0 grams of barium chloride and 75.0 grams of potassium sulfate to form solid barium sulfate and aqueous potassium chloride, given that the heat of formation of solid barium sulfate is -1474 kJ/mol and aqueous potassium chloride is -436 kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 50 views

Calculate the standard enthalpy change for the formation of ammonium chloride (NH4Cl) from its constituent elements, nitrogen (N2), hydrogen (H2), and chlorine (Cl2), given the following information:Reaction equation: N2(g) + 4H2(g) + 2Cl2(g) → 2NH4Cl(s)Standard enthalpy of formation for NH4Cl: -314.4 kJ/molStandard enthalpy of formation for N2(g): 0 kJ/molStandard enthalpy of formation for H2(g): 0 kJ/molStandard enthalpy of formation for Cl2(g): 0 kJ/mol Express your answer in kilojoules per mole (kJ/mol).

answered Feb 3 in Chemical thermodynamics

1 answer 38 views

How does changing the pH of a solution affect the formation of a complex ion using the example of [Cu(H2O)6]2+ forming [Cu(NH3)4(H2O)2]2+ at different pH values? Provide an explanation based on Le Chatelier's principle.

asked Feb 3 in Chemical equilibrium

1 answer 53 views

What is the dipole moment of carbon dioxide (CO2) molecule?

asked Jan 31 in Chemical bonding

1 answer 52 views

Calculate the enthalpy change of combustion for ethane (C2H6) given that the standard enthalpy of formation for ethane is -84.68 kJ/mol, the standard enthalpy of formation for CO2 is -393.5 kJ/mol, and the standard enthalpy of formation for H2O is -241.8 kJ/mol.

answered Jan 23 in ThermoChemistry

1 answer 65 views

Calculate the activation energy of a reaction that has a rate constant of 8.23 x 10^-4 s^-1 at 300 K and a rate constant of 1.56 x 10^-2 s^-1 at 350 K.

asked Jan 23 in Chemical kinetics

1 answer 69 views

What is the major product of the elimination reaction between 2-chlorobutane and potassium ethoxide in ethanol solvent?

asked Jan 21 in Organic Chemistry

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