Recent activity by YvetteLink0

1 answer 25 views

How does pH affect the stability and size of silver nanoparticles in a colloidal solution?

1 answer 26 views

How does the pH of the solution affect the rate of the photochemical reaction between a specific photosensitizer and a particular substrate, and how can we optimize the pH to obtain the maximum reaction rate?

answered Feb 22 in PhotoChemistry

1 answer 36 views

What is the optimal molar ratio of salicylic acid to acetic anhydride for synthesizing aspirin with a high yield?

answered Feb 21 in Chemical synthesis

1 answer 31 views

What is the coordination number and geometry of the metal ion in the active site of hemoglobin, a metalloprotein that carries oxygen in the blood? How does the coordination of the heme group with the iron ion contribute to the protein's function?

asked Feb 20 in Coordination Chemistry

1 answer 40 views

What is the mechanism involved in the long-range transportation of POPs and their subsequent deposition in remote locations, and how does this contribute to the persistence of POPs in the environment?

answered Feb 20 in Environmental Chemistry

1 answer 29 views

How does the length and saturation of fatty acid chains in a lipid bilayer affect membrane structure and properties as observed through molecular dynamics simulations?

asked Feb 20 in Computational Chemistry

1 answer 25 views

What is the effect of temperature on the rate of photochemical reactions that involve the isomerization of a molecule from the cis- to trans- configuration?

asked Feb 20 in PhotoChemistry

1 answer 22 views

What is the crystallographic structure of NaCl and how does it affect the physical properties of the substance? How does the crystal structure of NaCl differ from that of CsCl or diamond?

answered Feb 19 in Physical Chemistry

1 answer 32 views

What effect does temperature have on the reaction rate and efficiency of the reaction between hydrochloric acid and sodium thiosulfate?

asked Feb 17 in Chemical kinetics

1 answer 33 views

What are the key photochemical properties of photosensitive materials used in photography, and how do these properties determine the quality and characteristics of the final image produced?

asked Feb 14 in PhotoChemistry

1 answer 96 views

How can we use infrared spectroscopy to determine the identity of a functional group in a given organic compound?

answered Feb 13 in Physical Chemistry

1 answer 68 views

What is the mechanism of the nucleophilic addition reaction of ethanol with propanal in the presence of an acid catalyst, and how does the resulting product differ from the product formed if a base catalyst were used instead?

answered Feb 13 in Organic Chemistry

1 answer 57 views

Identify the type of intermolecular forces present in water and ammonia, and explain how these forces contribute to their physical properties.

answered Feb 13 in Chemical bonding

1 answer 44 views

How does the structure of hemoglobin influence its function as an oxygen transporter in the human body?

answered Feb 13 in Organic Chemistry

1 answer 50 views

How can the efficiency of the production process for biofuels be optimized through the use of catalysts and other chemical additives?

answered Feb 7 in Chemical engineering

1 answer 74 views

Given the following data for the electrochemical reaction A + B → C, where A and B are electrons:- The anodic Tafel slope is 50 mV per decade of current density.- The cathodic Tafel slope is 70 mV per decade of current density.Calculate the exchange current density (i0) for the reaction.

answered Feb 4 in ElectroChemistry

1 answer 71 views

Determine the standard enthalpy change of the precipitation reaction between aqueous solutions of copper (II) sulfate and calcium hydroxide, given that the reaction produces copper (II) hydroxide, solid calcium sulfate and water as the products. The initial concentrations of the solutions are 0.1 M for copper (II) sulfate and 0.05 M for calcium hydroxide, and the reaction takes place at constant pressure and temperature of 25°C.

asked Feb 4 in Chemical thermodynamics

1 answer 100 views

Calculate the standard enthalpy change for the following reaction involving liquids at 298 K: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l)Given the standard enthalpies of formation of C2H5OH(l), CO2(g) and H2O(l) are −277.6 kJ/mol, −393.5 kJ/mol and −285.8 kJ/mol respectively.

answered Feb 3 in Chemical thermodynamics

1 answer 58 views

Calculate the standard enthalpy change for the combustion of ethene gas (C2H4(g)) to form carbon dioxide gas (CO2(g)) and water vapor (H2O(g)), given the following thermochemical equations: C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(g) ΔH°=-1411 kJ/mol2H2(g) + O2(g) → 2H2O(g) ΔH°=-484 kJ/mol

asked Feb 3 in Chemical thermodynamics

1 answer 90 views

How does changing the concentration of reactants affect the rate of a reaction with a multi-step reaction mechanism?

asked Feb 3 in Chemical kinetics

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