Recent activity by LesleyTharp

1 answer 31 views

How does the presence of a protein affect the structural stability and flexibility of DNA in molecular dynamics simulations, and what are the underlying molecular mechanisms of this interaction at the atomic level?

asked Feb 22 in Computational Chemistry

1 answer 30 views

How does the intensity of light affect the rate of photochemical reactions in the presence of a photosensitizer or catalyst?

asked Feb 20 in PhotoChemistry

1 answer 39 views

How does the absorption of light by a molecule lead to the excited state dynamics and what is the role of ab initio calculations in understanding this process?

answered Feb 17 in Computational Chemistry

1 answer 36 views

What is the effect of surface coverage on the electronic properties of a metal surface, as predicted by density functional theory calculations?

answered Feb 14 in Computational Chemistry

1 answer 33 views

What is the difference between primary, secondary, and tertiary amines, and how does their basicity compare? Additionally, give an example of a common amine that is used in everyday products and explain its function.

answered Feb 14 in Organic Chemistry

1 answer 42 views

How does the process of photosynthesis involve the fixation of carbon dioxide and what is the significance of the enzyme rubisco in this process?

asked Feb 14 in BioChemistry

1 answer 46 views

What is the role of metal ions in the metalloenzyme carbonic anhydrase and how does this relate to its function in the human body?

asked Feb 13 in Coordination Chemistry

1 answer 61 views

What are the photochemical properties of Eu(DBM)3Phen in solution, and how does the presence of oxygen affect its photoluminescence behavior?

answered Feb 13 in PhotoChemistry

1 answer 66 views

How can we design an efficient and cost-effective system for extracting valuable metals like gold, silver, and platinum from electronic waste using chemical engineering principles?

asked Feb 12 in Chemical engineering

1 answer 48 views

How can the photochemical degradation of pollutants in the environment be optimized using advanced oxidation processes and what are the mechanisms involved?

answered Feb 10 in PhotoChemistry

1 answer 51 views

How can the mechanical properties of a polymer product be improved during the manufacturing process?

asked Feb 10 in Polymer Chemistry

1 answer 42 views

How can the design of a heat exchanger be optimized to increase the efficiency of the process in a chemical plant that produces ethylene using a catalytic cracker? Consider the specific heat transfer requirements, flow rates, pressure drops, and heat exchange surfaces for the system.

answered Feb 6 in Chemical engineering

1 answer 32 views

How can coordination chemistry principles be applied to design more efficient chelating agents for the treatment of heavy metal poisoning in humans?

answered Feb 5 in Coordination Chemistry

1 answer 44 views

How can chemistry be applied to address economic and societal challenges, such as developing sustainable and environmentally-friendly technologies, improving healthcare systems, and creating new materials for various industries?

answered Feb 4 in Chemical education

1 answer 63 views

How does changing the reactant concentration affect the rate of reaction in a reaction with a fixed stoichiometry?

asked Feb 3 in Chemical kinetics

1 answer 62 views

How does changing the concentration of the reactants affect the reaction rate and efficiency in the chemical reaction between sodium thiosulfate and hydrochloric acid?

answered Feb 3 in Chemical kinetics

1 answer 110 views

What is the concentration of iron (Fe) in a sample of water collected from a nearby river using spectrophotometric analysis?

asked Jan 30 in Analytical Chemistry

1 answer 19 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.

answered Jan 30 in Analytical Chemistry

1 answer 97 views

Calculate the enthalpy of solution for the dissolution of 15g of potassium chloride (KCl) in 100g of water (H2O) given that the temperature change was -12.5°C. The enthalpy of fusion for KCl is 17.2 kJ/mol and the specific heat capacity of water is 4.18 J/g•°C.

answered Jan 23 in ThermoChemistry

1 answer 41 views

A sample of nitrogen dioxide is placed in a container at 250°C and 1 atm, where it decomposes according to the following equation: 2NO2(g) ↔ 2NO(g) + O2(g)The initial concentration of NO2 is 0.10 M, and the equilibrium constant (Kc) at this temperature is 4.0 x 10^-3. If the volume of the container is suddenly decreased to one-half of its original volume, causing the pressure to double, what will happen to the amount of NO and O2 present at equilibrium? Calculate the new equilibrium concentrations of NO and O2.

answered Jan 22 in Chemical equilibrium

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