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What are the factors that affect the selectivity of a chemical reaction and how can quantum chemistry be used to predict and enhance selectivity in organic synthesis?

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

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How does the synthesis method affect the characteristics and performance of new materials used in fuel cells?

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

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What is the enthalpy change for the combustion of methane gas in a bomb calorimeter?

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

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What is the formal charge on the sulfur atom in SO4^(2-)?

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

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What is the standard enthalpy change for the fusion of solid sodium chloride at 25°C and 1 atm, given the following reaction: NaCl(s) → Na(l) + Cl2(g)?

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

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What is the standard entropy change of the combustion reaction of methane gas under standard conditions?

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

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What is the pH of a 0.1 M hydrochloric acid solution at 25°C, determined using a calibrated pH meter with a sensitivity of 0.01 pH units?

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

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How many resonance structures can be drawn for the nitrate ion (NO3-) and what are their respective bond lengths and partial charges on the atoms involved?

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

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What is the value of the corrosion potential (E_corr) for a silver metal electrode in 0.1M silver nitrate (AgNO3) solution of pH 5.5 and temperature 25°C, assuming the electrode as standard hydrogen electrode (SHE) reference?

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

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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 enthalpy change in kJ/mol when 2.00 g of methane (CH4) reacts with excess oxygen to form 1.50 g of carbon dioxide (CO2) and 0.75 g of water (H2O)? (Assume all reactants and products are in their standard states at 25°C and 1 atm pressure.)

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

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What is the theoretical yield of 2,4-dinitrophenylhydrazine that can be obtained from the reaction between 0.25 grams of hydrazine and 0.45 grams of 2,4-dinitrochlorobenzene, assuming a 100% conversion efficiency and complete reaction?

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

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What is the amount of heat energy required to melt 25 grams of ice at 0°C, given that the enthalpy of fusion of water is 6.01 kJ/mol?

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

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How can the Williamson ether synthesis be used to synthesize a symmetrical ether from two different alkyl halides? Provide a stepwise mechanism for the reaction.

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

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What would be the amount of heat energy required to change 100 grams of ice at -10°C into liquid water at 20°C? Given, the enthalpy of fusion of ice = 6.01 kJ/mol and the specific heat capacity of liquid water = 4.18 J/g°C.

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

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What is the effect of temperature on the behavior of a polymer chain using Monte Carlo simulations? Analyze the changes in the radius of gyration of the polymer chain as temperature is varied.

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

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What is the formal charge of the nitrogen atom in the molecule NO₂?

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

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What is the amount of heat absorbed by 25 g of ice at -10°C when it is converted to water at 20°C? Given the enthalpy of fusion of ice is 6.01 kJ/mol and the specific heat capacity of water is 4.18 J/g°C.

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

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What is the mechanism of the Williamson ether synthesis reaction, and how does changing the reaction conditions affect the yield and selectivity of the desired ether product?

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

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What is the amount of energy required to vaporize 50 grams of water at its boiling point, given that the enthalpy of vaporization of water is 40.7 kJ/mol?

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

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