Recent activity by TommyBarfiel

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What is the effect of solvent polarity on the strength of intermolecular interactions between a solute and solvent in a solution, and how can this be quantified using quantum chemistry calculations?

answered 5 days ago in Quantum Chemistry

1 answer 39 views

What spectroscopic techniques can be used to distinguish between isomers in coordination compounds? Provide examples and explain how they work.

answered Feb 14 in Coordination Chemistry

1 answer 30 views

How does prolonged exposure to high levels of air pollutant particles, such as PM2.5, affect the human respiratory system and overall health?

answered Feb 14 in Environmental Chemistry

1 answer 30 views

How do we predict the outcome of a redox reaction and determine the electron transfer rate for a given reaction using quantum chemical methods?

answered Feb 14 in Quantum Chemistry

1 answer 29 views

How does the molecular geometry and structure of a particular compound affect its reactivity in certain chemical reactions, and how can computational chemistry and molecular modeling be used to predict and optimize these reactions?

answered Feb 13 in Physical Chemistry

1 answer 40 views

What is the volume of 0.2 M hydrochloric acid that will completely react with 25 ml of 0.1 M sodium hydroxide in a neutralization reaction?

answered Feb 13 in Chemical reactions

1 answer 30 views

Using retrosynthesis, propose a viable pathway for the synthesis of Ibuprofen from readily available starting materials.

asked Feb 13 in Organic Chemistry

1 answer 39 views

How can the stability of an emulsion be improved using a specific surfactant?

asked Feb 10 in Surface Chemistry

1 answer 24 views

How can the efficiency of the production process for the pharmaceutical drug be optimized with the use of catalysts?

asked Feb 7 in Chemical engineering

1 answer 41 views

Calculate the polarization that occurs in an electrochemical cell when a current of 2 A flows through it for 10 minutes. The electrode area is 25 cm², and the current efficiency is 95%. The activation energy is 80 kJ/mol, and the reaction quotient is 2.5 x 10⁻⁵. The temperature of the cell is 25°C. Find the polarization resistance and the total polarization of the cell.

asked Feb 3 in ElectroChemistry

1 answer 44 views

How does changing the stoichiometric ratio of reactants affect the reaction rate of the chemical reaction between acid and calcium carbonate?

asked Feb 3 in Chemical kinetics

1 answer 74 views

What is the structure of the unknown compound X, based on its nuclear magnetic resonance spectrum, which shows a singlet at δ 7.8 ppm and a triplet at δ 1.2 ppm?

answered Jan 31 in Analytical Chemistry

1 answer 68 views

What is the chemical structure of an unknown compound based on its infrared spectrum, where a peak is observed at 3500 cm^-1 and no peaks are observed between 1600-1800 cm^-1?

asked Jan 31 in Physical Chemistry

1 answer 12 views

What is the concentration of copper ions present in a sample if the absorbance value is 0.345 and the path length is 1 cm? The molar absorptivity of copper ions is known to be 4.58 x 10^4 L mol^-1 cm^-1 at a wavelength of 600 nm in spectrophotometry.

asked Jan 30 in Analytical Chemistry

1 answer 91 views

How can X-ray fluorescence spectroscopy be used to identify the presence of specific elements in a sample with a high degree of accuracy and precision?

asked Jan 30 in Analytical Chemistry

1 answer 61 views

Calculate the enthalpy of adsorption of 1 mole of hydrogen gas on the surface of activated charcoal from the given data:- The heat of combustion of hydrogen gas at constant volume is -285.8 kJ/mol- The heat of combustion of hydrogen gas at constant pressure is -241.8 kJ/mol- The heat of vaporization of hydrogen gas at its boiling point (20.3 K) is 0.452 kJ/mol- The surface area of activated charcoal is 500 m²/g- The weight of activated charcoal used is 0.5 g.

asked Jan 23 in ThermoChemistry

1 answer 64 views

Calculate the enthalpy change for the following reaction, using Hess's Law:2H2S(g) + 3O2(g) → 2H2O(l) + 2SO2(g)Given the following enthalpy changes: 2H2(g) + O2(g) → 2H2O(l) ΔH1 = -484 kJ2SO2(g) + O2(g) → 2SO3(g) ΔH2 = -198 kJ2H2(g) + S(s) → H2S(g) ΔH3 = +25kJ

asked Jan 23 in Chemical reactions

1 answer 61 views

Calculate the enthalpy change for the adsorption of nitrogen gas on the surface of activated charcoal, given that the adsorption pressure is 1 atm at a temperature of 298 K. The quantity of nitrogen gas adsorbed is 0.01 moles per gram of charcoal, and the heat of combustion of the same amount of charcoal is -35.4 kJ/mol.

answered Jan 23 in ThermoChemistry

1 answer 52 views

Calculate the bond length between a fluorine atom (F) and a carbon atom (C) in a molecule of CF4, given that the bond energy is 544 kJ/mol and the force constant is 455 N/m.

answered Jan 23 in Chemical bonding

1 answer 78 views

A student needs to determine the enthalpy change (ΔH) for the reaction between ammonium nitrate (NH4NO3) and water (H2O) using Hess's Law calculations. Given the following information: - ΔHf° (NH4NO3) = -365.4 kJ/mol- ΔHf° (HNO3) = -207.3 kJ/mol- ΔHf° (NH4+) = -132.5 kJ/mol- ΔHf° (NO3-) = -206.1 kJ/mol- ΔHf° (H2O) = -285.83 kJ/molFormulate the thermochemical equation for the reaction by using the given data and Hess's Law calculations, and then calculate the enthalpy change for the reaction.

asked Jan 22 in ThermoChemistry

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