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What is the energy difference between the ground state and first excited state of the hydrogen atom using quantum chemical calculations?

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

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What is the change in enthalpy (ΔH) for the combustion of 10 grams of methane (CH4) at standard conditions, given the following balanced equation: CH4 + 2O2 → CO2 + 2H2O?

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

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What is the theoretical yield of acetylsalicylic acid that can be obtained from the reaction of 5 grams of salicylic acid and 10 mL of acetic anhydride, assuming complete reaction and 100% yield?

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

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What is the activation energy for the electrochemical reaction occurring between zinc and copper ions, given that the reaction has a rate constant of 1.5 x 10^-4 mol L^-1 s^-1 at 25°C and a rate constant of 6.2 x 10^-3 mol L^-1 s^-1 at 40°C?

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

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What are the main factors that contribute to the difficulty in understanding complex chemical concepts, and how can a chemistry student overcome those challenges in order to improve their understanding and performance in the subject?

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

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What is the maximum achievable monolayer coverage of a gas on a solid surface at a temperature of 25°C and a pressure of 1 atmosphere, given that the Langmuir constant is 0.05 L/mol?

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

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What is the exchange current density for the oxidation of iron in a 0.1 M Fe2+(aq) solution at 25°C, assuming the standard electrode potential for the Fe2+/Fe3+ couple is +0.77 V? The rate constant for the reaction is 1.2x10^-5 cm/s.

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

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What is the surface area of a powdered sample of activated carbon if the amount of nitrogen gas adsorbed at -196°C is 25.6 mL/g and the cross-sectional area of nitrogen molecule is 16.2 Å²?

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

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What is the polarization in an electrochemical cell when the current density is 200 A/m², the effective surface area of the electrode is 50 cm², the electrode potential is -0.5V and the electrolyte resistance is 10 Ω?

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

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What is the surface area of a sample of activated carbon if it adsorbed 2.5 moles of nitrogen gas at 77 K and 1 atm pressure? The cross-sectional area of nitrogen gas is known to be 16.2 square angstroms.

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

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What is the Gibbs free energy change for the reaction where 2 moles of hydrogen gas (H2) react with 1 mole of oxygen gas (O2) to form 2 moles of water vapor (H2O) at standard conditions (298 K and 1 atm pressure)?

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

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What chemical modifications can be made to the structure of conductive polymers in order to improve their conductivity and make them suitable for use in flexible electronic devices?

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

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What is the pH of a solution with 0.1 M HNO3 (nitric acid)?

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

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What is the standard enthalpy change for the phase transition reaction of ice to water at 1 atm and 25°C? Given the enthalpies of fusion and vaporization of water as 6.01 kJ/mol and 40.67 kJ/mol, respectively.

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

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What is the Gibbs free energy change for the electrochemical reaction involving the oxidation of copper, Cu, to copper (II) ions, Cu2+, in a solution of CuSO4 with a potential of 0.78 V at 25°C?

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

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What are the chemical compounds present in polluted water that cause harmful effects on aquatic life, and how can we effectively remove or minimize their presence in order to restore and maintain the health of the aquatic ecosystem?

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

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What is the pH level of a 0.1 M solution of hydrochloric acid (HCl) measured using a pH meter?

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

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

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

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What are the factors that affect the rate of corrosion on a metal surface and how can passivation be used to prevent it? Provide an example of a metal that is commonly passivated to protect it from corrosion.

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

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What is the formal charge on the nitrogen atom in the ammonium ion, NH4+?

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

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