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How can theoretical methods of quantum chemistry be used to predict the electronic and magnetic properties of molecular magnets, and what factors influence their magnetic behavior?

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

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What is the formal charge of the nitrogen atom in the molecule HNO<sub>3</sub>?

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

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What is the amount of energy required to vaporize 50 grams of water at its normal boiling point? The enthalpy of vaporization of water is 40.7 kJ/mol.

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

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What is the amount of energy required to melt 50 grams of ice at 0 °C to water at the same temperature? Given the enthalpy of fusion of water is 6.01 kJ/mol.

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

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What is the change in entropy when 2 moles of hydrogen gas react with 1 mole of oxygen gas to form 2 moles of water vapor at 298 K and 1 atm pressure?

asked Mar 1 in Chemical thermodynamics 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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What is the activation energy for the reaction between 2 M of HCl and 2 M of NaOH at a temperature of 25°C when a voltage of 1.5 V is applied?

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

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What is the enthalpy change of isomerization of butene-1 to cis-butene-2 at 25°C and 1 atm? Given that the molar enthalpy of combustion of butene-1 is -2657 kJ/mol and the molar enthalpy of combustion of cis-butene-2 is -2670 kJ/mol.

asked Mar 1 in ThermoChemistry 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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What is the electrical conductivity (in S/cm) of a 0.1 M solution of potassium chloride (KCl) at 25 degrees Celsius?

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

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What is the activation energy in Joules for a chemical reaction that has a rate constant of 2.7 x 10^-3 s^-1 and a temperature of 298 K? The activation energy can be calculated using the Arrhenius equation.

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

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How can we encourage and support underrepresented minority groups to pursue careers in chemistry and increase their representation in the field?

asked Mar 1 in Chemical education 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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How does the wavelength of light and the nature of the organic compound influence the mechanism of a photochemical reaction?

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

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What are the most effective strategies for improving understanding and retention of complex chemical concepts, and how can they be applied to specific areas of the subject, such as organic chemistry or physical chemistry?

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

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What is the diffusivity of oxygen gas in air at 25°C and 1 atm pressure? Assume ideal gas behavior and provide your answer in SI units.

asked Mar 1 in Physical Chemistry 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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What is the effect of pH on the zeta potential of colloidal particles, and how can the zeta potential measurement technique be employed to investigate this relationship?

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

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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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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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