Recent activity by AdaFennescey

1 answer 27 views

What are the effects of solvent viscosity on the folding/unfolding dynamics of a particular protein using molecular dynamics simulations?

asked Feb 20 in Computational Chemistry

1 answer 28 views

What is the critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS) in a 0.1 M NaCl solution, and how does it vary with temperature?

asked Feb 19 in Surface Chemistry

1 answer 40 views

How does the concentration of reactants and products at equilibrium affect the rate of a chemical reaction, and how can we experimentally investigate this effect?

answered Feb 19 in Chemical kinetics

1 answer 23 views

How does the concentration of pollutants and the specific surface area of activated carbon affect the adsorption efficiency of pollutants on activated carbon?

asked Feb 17 in Surface Chemistry

1 answer 26 views

How does temperature affect the ordering of liquid crystals modeled using Monte Carlo simulations?

answered Feb 17 in Computational Chemistry

1 answer 39 views

How can we predict the crystal structure of inorganic solids using experimental data and theoretical calculations, and what are the factors that affect the stability and formation of these structures?

answered Feb 14 in Inorganic Chemistry

1 answer 62 views

How does increasing the intensity of light affect the rate of photochemical reactions involving a specific molecule?

asked Feb 13 in PhotoChemistry

1 answer 13 views

How does cholesterol affect the fluidity of the cell membrane? Provide a detailed explanation with examples.

asked Feb 12 in BioChemistry

1 answer 77 views

Here's an example problem for the student to solve:When 0.10 moles of a weak acid HA are dissolved in 1.00 L of water, the pH of the resulting solution is measured to be 4.20. Calculate the equilibrium constant (Ka) for the dissociation of HA if the acid is known to be 10% ionized.

answered Feb 4 in Chemical equilibrium

1 answer 72 views

Design a heat exchanger for a specific process in which a 50,000 kg/day of a mixture with a specific heat capacity of 3.5 kJ/kg.K needs to be heated from 20°C to 70°C using a hot stream of 100,000 kg/day of a fluid with a temperature of 150°C. The heat exchanger needs to operate with a heat transfer coefficient of at least 400 W/m2.K and the pressure drop across the heat exchanger should be no more than 0.5 bar. What type of heat exchanger would be most suitable and what are the dimensions required to achieve the desired performance?

asked Feb 4 in Chemical engineering

1 answer 40 views

Consider the following reactions:1. Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g) ΔH₁ = -454.9 kJ/mol2. MgO(s) + 2HCl(aq) → MgCl₂(aq) + H₂O(l) ΔH₂ = -131.3 kJ/mol3. H₂(g) + ½O₂(g) → H₂O(l) ΔH₃ = -285.8 kJ/molUsing Hess's Law, calculate the enthalpy change for the following reaction:MgO(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g) given that the enthalpy change for the reaction Mg(s) + ½O₂(g) → MgO(s) is ΔH = -601.6 kJ/mol.

asked Feb 3 in ThermoChemistry

1 answer 69 views

Calculate the standard enthalpy change for the vaporization reaction of 25.0 g of water at 100°C and atmospheric pressure (1 atm).

asked Feb 3 in Chemical thermodynamics

1 answer 82 views

What are the electronic transport properties of a particular organic compound in its ground state as predicted by Density Functional Theory calculations? How do these properties vary with different temperatures and electric field strengths?

answered Jan 31 in Computational Chemistry

1 answer 87 views

How does an increase or decrease in temperature affect the fluidity of the cell membrane?

answered Jan 31 in BioChemistry

1 answer 106 views

Identify the major functional groups present in the biomolecule adenosine triphosphate (ATP) and explain their role in the biochemical reactions.

asked Jan 30 in Organic Chemistry

1 answer 104 views

What is the effect of adding a small amount of nickel to a titanium alloy on the strength and corrosion resistance of the alloy, and how does this influence its suitability for aerospace applications?

asked Jan 30 in Materials Chemistry

1 answer 30 views

How can the chemical engineer design a safe and cost-effective system for the production of cosmetics such as lotions and creams which align with regulatory standards and offer desirable shelf-life?

asked Jan 30 in Chemical engineering

1 answer 93 views

How can we use voltammetry to determine the concentration of lead in a water sample collected from a contaminated source?

answered Jan 30 in Analytical Chemistry

1 answer 64 views

Calculate the internal energy and entropy change for a gas that undergoes an isothermal expansion from 2.0 L to 3.0 L at a constant temperature of 300 K.

answered Jan 23 in Physical Chemistry

1 answer 77 views

Calculate the enthalpy of polymerization of ethylene from the following data: Ethylene, C2H4(g) polymerizes to form polyethylene, (C2H4)n(s) with ΔHrxn = -44.0 kJ/mol at 298 K. Additionally, it is known that the standard enthalpies of formation of C2H4(g) and polyethylene (C2H4)n(s) are 52.3 kJ/mol and -128.2 kJ/mol, respectively. Assuming the enthalpy of polymerization is independent of temperature, calculate ΔHºp for the reaction.

asked Jan 23 in ThermoChemistry

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