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How does the variation of lattice constant of perovskite materials affect their band gap energy and optical properties, as calculated through quantum chemistry methods?

asked Feb 28 in Quantum Chemistry by TheScientist (138k points)

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What are the factors affecting the adsorption of gases on solid surfaces and how can we experimentally determine the surface area of adsorbents such as activated carbon?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How does the use of different surfactants in detergents affect their cleaning efficiency on different types of stains?

asked Feb 28 in Surface Chemistry by TheScientist (138k points)

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What is the enthalpy change of hydrolysis for 10 grams of sucrose (C12H22O11) dissolved in 100 mL of water at 25°C? Given that the enthalpy of hydrolysis for sucrose is -564.8 kJ/mol.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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How does the type of amino acid residues in protein binding pockets affect the stability and dynamics of DNA-protein interactions in molecular dynamics simulations?

asked Feb 28 in Computational Chemistry by TheScientist (138k points)

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What is the enthalpy change of dissolving 10.0 g of NaCl in 500 mL of water at 25°C, assuming the solution has a specific heat capacity of 4.18 J/g°C?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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Sure! Here's a precise problem:Calculate the cell potential for the following electrochemical reaction: Fe(s) + Cu2+(aq) → Fe2+(aq) + Cu(s) Assume that the concentrations of Fe2+(aq) and Cu2+(aq) are both 1.00 M and the temperature is 25°C.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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How does the type of solvent used affect the rate of a chemical reaction between X and Y?

asked Feb 28 in Chemical kinetics by TheScientist (138k points)

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What is the cell potential for the following electrochemical reaction at 25°C? Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)Given: E° (Zn²⁺/Zn) = -0.76 VE° (Cu²⁺/Cu) = +0.34 V

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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How does the type of solvent affect the reaction rate of a chemical reaction, and what is the mechanism behind this effect?

asked Feb 28 in Chemical kinetics by TheScientist (138k points)

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Using standard enthalpies of formation, calculate the enthalpy change for the reduction of iron(III) oxide (Fe2O3) to iron metal (Fe).

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the heat capacity of a 50 g sample of iron at 25°C, given that the specific heat capacity of iron is 0.45 J/g °C?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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What is the current density (in A/cm²) of a copper electrode in contact with a 1 M solution of CuSO₄ at 25°C, assuming that the reduction of Cu²⁺ to Cu has an exchange current density of 10⁻⁶ A/cm² and a concentration overpotential of 20 mV?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the VSEPR geometry of methane (CH4)? How many electron groups surround the central carbon atom and what is the hybridization of the carbon atom in methane?

asked Feb 28 in Chemical bonding by TheScientist (138k points)

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How does the method of Time-Dependent Density Functional Theory (TDDFT) calculate electronic excited states and optical properties, and how is it different from other methods like Configuration Interaction (CI) and Coupled Cluster (CC)?

asked Mar 1 in Quantum Chemistry by TheScientist (138k points)

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1 answer 83 views

What is the step-by-step mechanism for the synthesis of nylon-6,6 from adipic acid and hexamethylenediamine, and how does changing the reaction conditions affect the yield and properties of the resulting polymer?

asked Feb 28 in Chemical synthesis by TheScientist (138k points)

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How does the zeta potential of a colloidal solution change with pH and ionic strength? Provide experimental evidence and explain the underlying electrokinetic phenomenon responsible for the observed trend.

asked Feb 28 in Surface Chemistry by TheScientist (138k points)

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1 answer 69 views

What are the metabolic changes that occur in a cell when exposed to a specific drug, and what is the mechanism that causes these changes?

asked Mar 1 in BioChemistry by TheScientist (138k points)

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What is the relationship between the magnitude of the zeta potential and the stability of colloidal particles? Use experimental evidence to support your answer.

asked Feb 28 in Surface Chemistry by TheScientist (138k points)

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What is the standard enthalpy change for the neutralization of 50mL of 1M HCl solution with 50mL of 1M NaOH solution at 25°C?

asked Mar 1 in Chemical thermodynamics by TheScientist (138k points)

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