Recent activity by ModestaDavey

1 answer 30 views

How do the photochemical properties of metal nanoparticles differ from those of semiconductor nanoparticles, and how can these differences be attributed to their electronic structures?

answered Feb 22 in PhotoChemistry

1 answer 30 views

What is the optimum ratio of aniline to nitric acid for the preparation of p-nitroaniline in the chemical synthesis process?

answered Feb 22 in Chemical synthesis

1 answer 33 views

How does the incorporation of specific metal ions into a metal-organic framework (MOF) affect the predicted electronic and magnetic properties of the MOF?

answered Feb 20 in Quantum Chemistry

1 answer 26 views

What is the effect of concentration on the reaction rate of the reaction between potassium iodate and sodium sulfite, and how does this affect the overall sustainability of the reaction?

asked Feb 19 in Chemical kinetics

1 answer 45 views

How does the catalytic mechanism of the enzyme aldolase differ from a synthetic aldol reaction, based on computational studies of enzyme catalysis?

asked Feb 18 in Computational Chemistry

1 answer 42 views

Identify the type of bonding present in sodium chloride (NaCl), diamond (C), and copper (Cu) and explain the difference in their physical properties based on their bonding type.

asked Feb 14 in Chemical bonding

1 answer 58 views

What are the primary sources of nutrient pollution that lead to eutrophication in aquatic ecosystems, and how do they impact the nitrogen and phosphorus cycles?

asked Feb 14 in Environmental Chemistry

1 answer 61 views

What is the effect of increasing the pH on the equilibrium position of the following acid-base reaction: CH3COOH (aq) + H2O (l) ⇌ CH3COO- (aq) + H3O+ (aq) How does the equilibrium shift and what is the new equilibrium constant at a given pH?

answered Feb 13 in Chemical equilibrium

1 answer 72 views

How can the process parameters of polymer production be optimized to achieve high yield and quality of the resulting polymer product?

answered Feb 10 in Chemical engineering

1 answer 56 views

How can the mechanical properties (such as tensile strength, elongation, and hardness) of polyurethane be optimized by controlling the reaction parameters in the synthesis process using different diisocyanate and polyol combinations?

asked Feb 10 in Chemical synthesis

1 answer 44 views

How can quantum chemical calculations help explain the strength and stability of non-covalent interactions between molecules such as hydrogen bonding, van der Waals forces, and π-π stacking in biological systems? Provide specific examples from published literature where these calculations have been used to investigate non-covalent interactions in biomolecules such as proteins, nucleic acids, or carbohydrates.

answered Feb 5 in Computational Chemistry

1 answer 33 views

Consider the reaction: 2NOBr(g) <=> 2NO(g) + Br2(g), which has an equilibrium constant of 1.5 x 10^-5 at a certain temperature. If you start with 0.10 M of NOBr and let the reaction reach equilibrium, find the equilibrium concentrations of NOBr, NO, and Br2.

asked Feb 3 in Chemical equilibrium

1 answer 94 views

Calculate the standard enthalpy change (∆H°) for the dissolution of 5.00 g of solid NaOH in 100.0 mL of water, given that the temperature of the solution increased from 25.0°C to 27.5°C. The density of the solution is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/(g°C). The molar mass of NaOH is 40.00 g/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 85 views

Calculate the standard electrode potential for the following redox reaction in acidic medium using the standard reduction potentials given below:Fe2+(aq) + MnO4-(aq) + H+(aq) → Fe3+(aq) + Mn2+(aq) + H2O(l)Standard reduction potentials:Fe3+(aq) + e- → Fe2+(aq) Eo = +0.77 VMnO4-(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l) Eo = +1.51 V

asked Feb 3 in Chemical thermodynamics

1 answer 81 views

Calculate the overpotential of an electrochemical cell where Zinc metal is used as an anode and Copper metal as a cathode. The concentration of Zinc ions in the half-cell is 1 M and Copper ions in the half-cell is 0.1 M. The temperature of the system is 25°C. (Given: Standard Reduction Potentials - Zn²⁺ + 2e⁻ → Zn(s) = -0.76 V and Cu²⁺ + 2e⁻ → Cu(s) = +0.34 V)

answered Feb 3 in ElectroChemistry

1 answer 81 views

What is the effect of changes in pH on the secondary structure of proteins?

answered Jan 31 in BioChemistry

1 answer 49 views

What functional group(s) are present in the given compound and at what wavelength do they absorb maximum in UV-Vis spectroscopy?

asked Jan 30 in Analytical Chemistry

1 answer 85 views

Calculate the cell potential for a given electrochemical reaction where the half-cell reactions are:* Fe3+(aq) + e- → Fe2+(aq) E° = 0.77 V* Ag+(aq) + e- → Ag(s) E° = 0.80 VAssume 1.0 M solutions and standard state conditions. Determine whether the reaction is spontaneous or non-spontaneous under standard conditions.

answered Jan 23 in ElectroChemistry

1 answer 64 views

Calculate the activation energy required for a chemical reaction to occur, given that the rate constant at 298 K is 4.70 x 10^-3 s^-1 and the rate constant at 313 K is 1.20 x 10^-2 s^-1. (Assume the Arrhenius equation applies.)

answered Jan 23 in Chemical reactions

1 answer 87 views

A student synthesized two coordination compounds containing the same metal ion, ligands, and donor atoms. However, the student found that the two compounds exhibited different physical and chemical properties. Explain the possible types of isomerism that could exist in these coordination compounds and how they can be distinguished.

answered Jan 22 in Coordination Chemistry

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