Questions by RobertoLafla

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1 answer 25 views

What is the mechanism behind the photo-induced isomerization of [Ru(bpy)3]2+ (tris(bipyridine)ruthenium(II)) and why does the process occur rapidly in solution but slowly in solid state?

asked Feb 22 in Quantum Chemistry

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1 answer 33 views

What is the optimal ratio of diisocyanate and polyol in the synthesis of polyurethane to achieve the desired mechanical properties and durability of the resulting material?

asked Feb 21 in Chemical synthesis

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1 answer 32 views

How does the metabolism of lipids affect the signaling pathways involved in insulin resistance, and how can this understanding be used in the development of new drugs for the treatment of diabetes?

asked Feb 20 in BioChemistry

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1 answer 28 views

How does the depth and concentration of a catalyst affect the reaction rate and ultimately the profitability of a chemical reaction?

asked Feb 19 in Chemical kinetics

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1 answer 33 views

How does the choice of the type and size of the solid catalyst affect the rate of the catalytic reaction in surface chemistry?

asked Feb 18 in Surface Chemistry

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1 answer 35 views

How does the choice of dopant and host materials affect the photochemical properties and efficiency of luminescent materials in organic light-emitting diodes (OLEDs)?

asked Feb 18 in PhotoChemistry

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1 answer 29 views

What is the bond angle of water molecule (H2O) according to the VSEPR theory and how does it affect the molecule's structure and properties?

asked Feb 18 in Chemical bonding

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1 answer 40 views

How can the photochemical degradation of pollutants in the environment be enhanced using different types of visible light-activated catalysts?

asked Feb 10 in PhotoChemistry

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1 answer 43 views

How can the design of the transportation system for hazardous chemicals be improved to minimize the risk of accidents and ensure safe transport and storage? Include factors such as container design, transportation route, emergency preparedness, and regulatory compliance in your analysis.

asked Feb 7 in Chemical engineering

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1 answer 42 views

How can chemistry departments in schools secure more funding and resources to improve the quality and relevance of chemistry education for their students?

asked Feb 4 in Chemical education

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1 answer 74 views

Here is a precise problem for the student to solve:Using ab initio calculations, determine the electronic structure and energetics of a transition metal complex, specifically a ruthenium-based complex with ligands consisting of two bipyridine molecules and one 2,2'-bipyridine-4,4'-dicarboxylic acid molecule. Compare the calculated properties to experimental data and discuss the accuracy of the theoretical approach used.

asked Feb 4 in Computational Chemistry

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1 answer 79 views

Calculate the weight-average molecular weight of a polymer sample with the following information:- The polydispersity index (PDI) of the sample is 1.5.- The number-average molecular weight (Mn) of the sample is 20,000 g/mol. - The weight fraction (w) of the polymer with a molecular weight of 30,000 g/mol is 0.2, and the weight fraction of the polymer with a molecular weight of 10,000 g/mol is 0.8.

asked Feb 3 in Physical Chemistry

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1 answer 68 views

What is the effect of changing the molecular structure of a liquid crystal on its thermal properties, such as melting point and heat capacity, as predicted by Monte Carlo simulations?

asked Feb 3 in Computational Chemistry

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1 answer 95 views

What is the boiling point of a substance with a molecular formula of C6H14 if it experiences dipole-dipole interactions and London dispersion forces? Show your calculation and explain your reasoning.

asked Jan 31 in Chemical bonding

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1 answer 60 views

How can the presence of functional groups in an unknown sample of organic compound be identified using infrared spectroscopy? Provide a step-by-step approach to interpret an infrared spectrum and identify the functional groups present in the compound.

asked Jan 29 in Analytical Chemistry

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1 answer 67 views

Calculate the change in enthalpy (ΔH) for the combustion of methane gas (CH4) at 25°C and constant pressure of 1 atm. The equation for the combustion of methane is:CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) Given the standard enthalpies of formation at 25°C are:ΔHf[CH4 (g)] = -74.87 kJ/mol ΔHf[CO2 (g)] = -393.5 kJ/mol ΔHf[H2O (l)] = -285.8 kJ/mol Assume that water is in its liquid phase at the end of the reaction.

asked Jan 23 in Physical Chemistry

+1 vote

1 answer 103 views

A chemistry student needs to quantify the amount of iron (II) ions in a sample using colorimetry. The sample was prepared by dissolving a known mass of iron (II) sulfate in water, and the solution was diluted to a known volume. The student needs to determine the concentration of iron (II) ions in the original solution by measuring the absorbance of the sample using a colorimeter, and then using calibration curves to convert the absorbance to concentration. The student also needs to calculate the percentage error of the experiment and suggest ways to improve the accuracy of the results.

asked Jan 22 in Analytical Chemistry

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1 answer 108 views

What is the product obtained when 2-methyl-2-butene reacts with HBr in the presence of peroxide?

asked Jan 21 in Organic Chemistry

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1 answer 89 views

When was the Stroop effect discovered?

asked Jan 20 in Psychology

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1 answer 43 views

What is the role of social psychology in communities?

asked Jan 20 in Psychology

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