Questions by DannieGuf001

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1 answer 20 views

What is the ideal molar ratio of adipic acid to hexamethylenediamine needed for the synthesis of nylon-6,6 with the highest possible yield and quality?

asked 5 days ago in Chemical synthesis

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1 answer 15 views

What is the heat of sublimation for dry ice (solid carbon dioxide) given that its enthalpy of fusion is 9.2 kJ/mol and its enthalpy of vaporization is 25.1 kJ/mol?

asked 5 days ago in ThermoChemistry

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1 answer 17 views

What is the effect of substrate roughness on the adhesion strength of a polymer coating?

asked 6 days ago in Polymer Chemistry

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1 answer 17 views

What is the coordination number of the Eu(III) ion in the complex [Eu(NO3)3(H2O)9]? Explain the factors that determine the coordination number of lanthanide ions in coordination complexes.

asked 6 days ago in Coordination Chemistry

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1 answer 23 views

How does the coordination chemistry of metalloproteins and metalloenzymes influence their functionality in biological systems?

asked 6 days ago in Coordination Chemistry

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1 answer 25 views

How does the composition of glasses affect their refractive index and dispersion, and how can this knowledge be applied to develop glasses with specific optical properties for use in applications such as lenses, fiber optics, and display technology?

asked Feb 18 in Materials Chemistry

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1 answer 24 views

How does the choice of adhesive or coating affect the surface properties of a material, and how can these properties be optimized for specific applications?

asked Feb 18 in Surface Chemistry

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1 answer 35 views

What factors determine the bond strength of a molecule and how can we predict its bond strength using those factors? Give an example of a molecule with a weak bond and a molecule with a strong bond, and explain why their bond strengths differ.

asked Feb 18 in Chemical bonding

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1 answer 28 views

What is the balanced chemical equation for the combustion of ethane (C2H6) in the presence of oxygen (O2) to produce carbon dioxide (CO2) and water (H2O)?

asked Feb 17 in Chemical reactions

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1 answer 9 views

How do specific amino acid residues affect the stability of DNA-protein complexes? Provide experimental evidence using in vitro assays.

asked Feb 14 in BioChemistry

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1 answer 34 views

How does the molecular geometry of a molecule impact its electronic structure, and how can this be calculated using molecular orbital theory?

asked Feb 13 in Quantum Chemistry

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1 answer 40 views

What is the effect of inhibitor concentration on the reaction rate of the enzyme catalyzed reaction and how can it be described by Michaelis-Menten kinetics?

asked Feb 13 in BioChemistry

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1 answer 35 views

What are the effects of doping on the electrical and optical properties of semiconductors, and how does the dopant concentration affect these properties?

asked Feb 12 in Materials Chemistry

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1 answer 34 views

How can the chemical structure of existing medications for gastrointestinal diseases be modified to increase their effectiveness and reduce their side effects?

asked Feb 6 in Medicinal Chemistry

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1 answer 40 views

How can one determine if a molecule exhibits positional isomerism or functional isomerism? Provide examples of each type of isomerism, and explain the structural differences between the isomers.

asked Feb 5 in Chemical bonding

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1 answer 60 views

Calculate the standard enthalpy change (∆H°) for the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) given the following information:- Balanced chemical equation: HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)- ∆H°f of NaCl(aq) = -407.3 kJ/mol- ∆H°f of H2O(l) = -285.8 kJ/mol- Heat capacity of the system, Cp = 4.18 J/g.K- Mass of the HCl solution used = 50.0 g- Concentration of HCl solution = 0.100 M- Volume of NaOH solution used = 100.0 mL- Concentration of NaOH solution = 0.200 MAssume that the specific heat of the solution is equal to that of water at 4.18 J/g.K and that the density o

asked Feb 3 in Chemical thermodynamics

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1 answer 35 views

How can the practical applications of chemistry, such as developing new drugs or creating sustainable energy sources, be highlighted more effectively in chemistry education to motivate students to pursue careers in these areas?

asked Jan 30 in Chemical education

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1 answer 61 views

How can we determine the concentration of caffeine in a sample of coffee using liquid chromatography?

asked Jan 29 in Analytical Chemistry

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1 answer 68 views

Calculate the lattice energy of LiF using the Born-Haber cycle, given the following enthalpies of formation and sublimation energies: ΔH°sub (Li) = 161 kJ/mol ΔH°sub (F2) = 155 kJ/mol ΔH°f (LiF) = - 590 kJ/mol IE (Li) = 520 kJ/mol EA (F) = -328 kJ/mol.

asked Jan 23 in Inorganic Chemistry

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1 answer 41 views

Calculate the heat of formation of Methane (CH4), given the following enthalpy changes:- Enthalpy change of combustion of methane = -890.4 kJ mol^-1- Enthalpy change of formation of water = -285.8 kJ mol^-1- Enthalpy change of formation of carbon dioxide = -393.5 kJ mol^-1

asked Jan 23 in Chemical bonding

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