Recent activity by MalcolmUribe

1 answer 31 views

How do changes in the size and shape of nanoparticles affect their electronic and optical properties and how can these properties be calculated using quantum chemistry methods?

answered Feb 24 in Quantum Chemistry

1 answer 35 views

What is the most effective method for the remediation of a chlorinated solvent plume in a groundwater system, and how can it be optimized?

asked Feb 21 in Environmental Chemistry

1 answer 39 views

How does the molecular weight and branching of a polymer affect its suitability for use in 3D printing, and how can these properties be optimized for improved printing quality and mechanical strength of the printed object?

answered Feb 21 in Materials Chemistry

1 answer 31 views

What is the effect of temperature on the adsorption of gas molecules on a solid surface? Is the adsorption process exothermic or endothermic? Support your answer with experimental data and a suitable equation.

answered Feb 19 in Physical Chemistry

1 answer 33 views

What is the dipole moment of carbon dioxide (CO2) molecule?

asked Feb 19 in Chemical bonding

1 answer 38 views

How does the change in temperature affect the rate of electron transfer in a redox reaction between iron and copper ions in an aqueous solution, according to the principles of quantum chemistry?

answered Feb 18 in Quantum Chemistry

1 answer 32 views

How do quantum chemical calculations help in predicting the strengths of non-covalent interactions in different chemical systems? Provide specific examples of chemical systems where accurate predictions have been made using quantum chemical calculations.

asked Feb 14 in Computational Chemistry

1 answer 31 views

How can we optimize the synthesis process of metal-organic frameworks to achieve higher purity and yield?

asked Feb 14 in Materials Chemistry

1 answer 66 views

How can the surface chemistry of adhesives and coatings be manipulated to achieve strong and durable bonding on different types of substrates, such as metals, plastics, and composites?

answered Feb 11 in Surface Chemistry

1 answer 39 views

How can magnetic resonance spectroscopy be used to determine the purity and concentration of a sample of aspirin? Provide a step-by-step explanation of the process and discuss the factors that can affect the accuracy of the results.

answered Feb 5 in Physical Chemistry

1 answer 38 views

How can chemistry students in low-resource areas access quality textbooks and resources to enhance their understanding of complex topics?

answered Feb 5 in Chemical education

1 answer 84 views

Design a process for the purification of 500 grams of crude aspirin containing impurities such as acetic acid and sulfuric acid. The final product must have a purity of at least 99.5%. Describe the steps involved in the purification process, including the necessary equipment, reagents, and conditions for each step. Also, calculate the percent yield of the final product based on the initial mass of crude aspirin.

answered Feb 4 in Chemical engineering

1 answer 69 views

What is the effect of changing the surface functionalization of gold nanoparticles on their stability and reactivity in water, as predicted by molecular dynamics simulations?

answered Feb 3 in Computational Chemistry

1 answer 102 views

How do changes in the primary structure of a protein affect its function? Using hemoglobin as an example, explain how a single amino acid substitution can affect its ability to transport oxygen.

asked Jan 31 in BioChemistry

1 answer 75 views

What is the chemical process involved in carbon fixation during photosynthesis, and how does it contribute to the conversion of carbon dioxide gas into organic compounds?

asked Jan 31 in BioChemistry

1 answer 176 views

How does the mechanism of action of aspirin differ from that of ibuprofen, and how does this difference affect their efficacy as pain relievers?

asked Jan 31 in Medicinal Chemistry

1 answer 98 views

What is the electronic structure and composition of the first excited state of the ethylene molecule (C2H4) using time-dependent density functional theory?

asked Jan 31 in Computational Chemistry

1 answer 106 views

What is the effect of altering the concentration of reactants and products on the equilibrium constant and reaction rate of a reversible reaction?

answered Jan 31 in Chemical kinetics

1 answer 55 views

Calculate the lattice energy of magnesium oxide (MgO) given that the lattice enthalpy of magnesium (Mg) is 3944 kJ/mol and that of oxygen (O) is 751 kJ/mol.

asked Jan 23 in Inorganic Chemistry

1 answer 69 views

Assuming complete reaction, a chemistry student added 32 grams of reactant A to a reaction mixture that should produce 28 grams of product B. However, the actual yield of B was only 22 grams. What is the percent yield of product B for this chemical reaction?

asked Jan 22 in Chemical reactions

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