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What is the effect of molecular weight and concentration of a polymer on its viscosity and shear rate in melt processing?

asked Feb 28 in Polymer Chemistry by TheScientist (138k points)

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What is the corrosion current density of Zinc (Zn) metal in a galvanic couple with Copper (Cu) in a 0.1 M KCl electrolyte solution at 25 °C, given that the open circuit potential of the couple is -0.439 V and the polarization resistance is 625 Ω?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the enthalpy of combustion of ethane (C2H6), given that the complete combustion of 2.00 grams of ethane in excess oxygen produces 11.2 kJ of heat?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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How does the temperature affect the reaction rate and profitability of the reaction between hydrochloric acid and magnesium ribbon?

asked Feb 28 in Chemical kinetics by TheScientist (138k points)

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What are the most effective methods to optimize the durability and surface properties of polyurethane-based coatings?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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What is the heat of neutralization of hydrochloric acid (HCl) and sodium hydroxide (NaOH) when 50 mL of 2.0 M HCl is reacted with 50 mL of 2.0 M NaOH, given that the initial and final temperatures of the solution are 25°C and 39°C, respectively?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the optimum reaction conditions (temperature, pressure, catalyst, etc.) for the synthesis of polyvinylpyrrolidone from vinylpyrrolidone monomer to achieve the highest yield and desired molecular weight?

asked Feb 28 in Chemical synthesis by TheScientist (138k points)

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What factors affect the adhesion of coatings to surfaces, and how can these factors be controlled to optimize the performance of the coating?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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Identify the type of bonding in sodium chloride and explain using evidence from its structure and properties.

asked Feb 28 in Chemical bonding by TheScientist (138k points)

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How does the temperature affect the rate of a gas-phase reaction, and how can Monte Carlo simulations be used to study the reaction at different temperatures?

asked Feb 28 in Computational Chemistry by TheScientist (138k points)

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How does the use of different types of polymer-based packaging materials affect the environment, and what measures can be taken to minimize their negative impact?

asked Feb 28 in Polymer Chemistry by TheScientist (138k points)

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What is the molar yield of the 2,4,6-trinitrotoluene product obtained from the reaction of 100 grams of toluene with excess nitric acid?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What are the factors affecting the adsorption of gases on solid surfaces and how can we experimentally determine the surface area of adsorbents such as activated carbon?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How does the wavelength of light affect the rate of a photochemical reaction? Provide a detailed experimental design to investigate this relationship, including the necessary equipment and reagents needed.

asked Feb 28 in Physical Chemistry by TheScientist (138k points)

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How does the temperature affect the rate of gas phase reaction between hydrogen gas and iodine gas, represented as H2(g) + I2(g) ⇌ 2HI(g)? Develop a kinetic model that can explain this relationship of temperature and the rate constant of this reaction.

asked Feb 28 in Physical Chemistry by TheScientist (138k points)

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How does the Ubiquitin-Proteasome System selectively target specific proteins for degradation, and what are the chemical mechanisms involved in this process?

asked Feb 28 in BioChemistry by TheScientist (138k points)

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What types of polymers are commonly used in the production of membranes for water treatment, and how do their chemical properties affect their filtration performance?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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How does the variation of ligand field strength affect the electronic and magnetic properties of transition metal complexes? Provide a theoretical explanation supported by experimental evidence.

asked Feb 28 in Quantum Chemistry by TheScientist (138k points)

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Sure! Here's a precise problem:Calculate the cell potential for the following electrochemical reaction: Fe(s) + Cu2+(aq) → Fe2+(aq) + Cu(s) Assume that the concentrations of Fe2+(aq) and Cu2+(aq) are both 1.00 M and the temperature is 25°C.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the synthesis pathway for the heterocyclic compound pyrrole, and what reagents and conditions are required for this reaction to occur?

asked Mar 1 in Organic Chemistry by TheScientist (138k points)

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