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How can the synthesis of quantum dots be improved by adjusting the reaction conditions (such as temperature, solvent, and precursor concentration) and how does this affect the optical and electronic properties of the quantum dots produced?

asked Feb 28 in Materials 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 modifications can be made to the chemical structure of polymer-based adhesives and sealants to improve their adhesion and moisture resistance properties?

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

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What are the different types of chemical reactions and their associated equations? Provide examples of each type of reaction and explain how to identify them.

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

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What is the heat capacity of a 50 g copper block when heated from 25°C to 95°C, given that the specific heat capacity of copper is 0.385 J/g·°C? Calculate the amount of heat energy required to raise the temperature of the copper block by 70°C.

asked Mar 1 in ThermoChemistry 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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What is the theoretical yield of 2,4-dinitrobenzoic acid that can be obtained from the reaction of 10 grams of benzoic acid with excess nitric acid, if the reaction has a 75% yield?

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

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What is the heat of neutralization of sulfuric acid (H2SO4) with sodium hydroxide (NaOH) at constant pressure if 50 mL of 2.0 M H2SO4 is reacted with 50 mL of 2.0 M NaOH?

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

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What is the heat of mixing when 50 mL of 1 M HCl is added to 50 mL of 1 M NaOH at 25°C assuming no heat loss to the surroundings? Given, the enthalpy of neutralization of 1 M HCl by 1 M NaOH is -55.9 kJ/mol.

asked Mar 1 in ThermoChemistry 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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How does the temperature affect the orientational order parameter of a liquid crystal using Monte Carlo simulations?

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

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What is the anodic Tafel slope for an electrochemical reaction where the current density increases by a factor of 10 as the overpotential increases from 0.1 V to 0.3 V? The exchange current density at the electrode is 1.0 x 10^-5 A/cm^2.

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

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What is the activation energy for the electrochemical reaction between copper and zinc ions using a copper-zinc galvanic cell at 25°C and a potential difference of 1.8V?

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

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1 answer 68 views

What is the enthalpy change for the reduction of iron(III) oxide to iron using hydrogen gas, given that the reaction produces 2 moles of water and the standard enthalpy of formation for iron(III) oxide is -824 kJ/mol and for water is -286 kJ/mol?

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

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1 answer 69 views

What is the diffusion coefficient of oxygen in air at a temperature of 298 K and a pressure of 1 atm? Show the calculation and units used.

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

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Using molecular orbital theory, calculate the bond order of the carbon monoxide (CO) molecule.

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

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What is the enthalpy change for the isomerization of 2-butene to 1-butene at constant pressure, given that the standard enthalpy of formation of 2-butene is -118.0 kJ/mol and the standard enthalpy of formation of 1-butene is -133.9 kJ/mol?

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

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1 answer 71 views

What is the balanced redox equation for the reaction between potassium dichromate (K2Cr2O7) and ethanol (C2H5OH) in acidic medium? Calculate the oxidation number of chromium in the dichromate ion before and after the reaction.

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

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1 answer 77 views

What is the VSEPR geometry of a molecule with four bonded atoms and one lone pair of electrons on the central atom?

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

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What is the VSEPR geometry of a molecule with the following electron geometry: tetrahedral and no lone pairs?

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

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