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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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What surface modifications can be made to biomaterials to enhance their biocompatibility and reduce the risk of adverse reactions when used in medical implants?

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

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Using standard enthalpies of formation, calculate the enthalpy change for the reduction of iron(III) oxide (Fe2O3) to iron metal (Fe).

asked Mar 1 in ThermoChemistry 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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How does the average chain length and chain flexibility affect the thermodynamic behavior of polyethylene using Monte Carlo simulations?

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

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What is the enthalpy change for the reaction: 2H2(g) + O2(g) → 2H2O(l) given the following bond enthalpy values: H-H: 436 kJ/mol, O=O: 495 kJ/mol, H-O: 464 kJ/mol (assume that all gases are at standard conditions)?

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

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How does the use of computational methods in quantum chemistry allow for the accurate prediction of reaction pathways and the selectivity of reactions?

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

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What are the common misconceptions that students have when trying to understand the organization of the periodic table? How can these misconceptions be overcome to better understand the properties and trends of chemical elements within the table?

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

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What is the effect of pH on the zeta potential of a dispersed system? Use a specific example from surface chemistry to explain the relationship between pH, zeta potential, and surface charge.

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

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What is the VSEPR geometry of NH3 (ammonia) molecule?

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

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How does the use of synthetic fertilizers in sustainable agriculture impact the quality of soil and water resources in the surrounding environment?

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

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What are the common misconceptions about chemical bonding and molecular structure that students often have, and how can they be addressed effectively in the classroom to improve understanding and retention of these concepts?

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

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What will be the corrosion rate of iron in a hydrochloric acid solution if a piece of iron with a surface area of 10 cm² loses 0.5 grams of mass after being immersed in the solution for 24 hours? Show your calculation with correct units.

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

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Sure, here's a question for you to solve:Calculate the bond energy required to break the H-O bond in water (H2O). Given that the bond energy of the H-H bond is 436 kJ/mol and O=O bond is 495 kJ/mol.

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

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What spectroscopic techniques can be used to study the coordination geometry and bonding of transition metal complexes? Provide specific examples and discuss the advantages and limitations of each technique.

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

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What is the bond energy required to break the bond between two nitrogen atoms (N2) if the bond length is 109.76 pm?

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

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What is the equilibrium constant at a temperature of 298 K for the reaction 2NOCl(g) ⇌ 2NO(g) + Cl2(g) if the initial concentrations at equilibrium are [NOCl] = 0.200 M, [NO] = 0.0250 M, and [Cl2] = 0.0250 M?

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

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What is the VSEPR geometry of a molecule that has a central atom with four electron domains and two of them are lone pairs?

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

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