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What is the effect of a change in pH on the zeta potential of a colloidal suspension? Provide experimental evidence to support your answer.

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

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How does the chemical structure of thymine differ from uracil and why is it important in DNA replication and repair?

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

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What are the factors that affect the strength of chemical bonds and how do these factors contribute to the properties of different molecular structures?

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

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What is the VSEPR geometry of a molecule consisting of one central atom and five atoms attached to it, where the central atom has two lone pairs of electrons?

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

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How does the zeta potential of a colloidal solution change with pH and ionic strength? Provide experimental evidence and explain the underlying electrokinetic phenomenon responsible for the observed trend.

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

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Identify the type of intermolecular force present in water (H2O).

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

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How does the use of a catalyst affect the rate of the reaction between hydrogen peroxide and potassium iodide?

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

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What is the optimal temperature and catalyst mixture for the synthesis of polypropylene from propylene monomer? Determine the yield and properties of the resulting polymer under these conditions.

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

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What is the standard enthalpy change for the neutralization of 50mL of 1M HCl solution with 50mL of 1M NaOH solution at 25°C?

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

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What is the lattice energy of CaF2 in kilojoules per mole given that the distance between the calcium ion and fluoride ion is 2.01 Å and the charges on the ions are +2 and -1 respectively?

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

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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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What is the formal charge on the carbon atom and the nitrogen atom in the molecule NH₄⁺? Show your calculations and explain how you arrived at your answer using the formula for calculating formal charge.

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

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What is the anodic Tafel slope for the oxidation of iron in a solution with a pH of 3? Given that the corrosion current density is 2.5 x 10^-6 A/cm2 and the overpotential is 0.2 V.

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

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How does the viscosity of ionic liquids change with the length of their alkyl chains?

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

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What are the factors affecting the rate of crystallization of polymers and how does each factor affect the overall morphology of the polymer crystal structure?

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

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Question: The heat of sublimation of iodine is 62.44 kJ/mol. Calculate the amount of heat required for subliming 20 g of iodine at its melting point of 387 K.

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

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How can the yield of the synthesis of nylon-6,6 from adipic acid and hexamethylenediamine be improved by modifying the reaction parameters and what impact does the modification have on the properties of the resulting polymer?

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

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What is the formal charge on the nitrogen atom in the compound ammonium chloride (NH4Cl)? Show your work in calculating the formal charge.

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

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What is the amount of heat released when burning 5.00 grams of methane (CH4) in excess oxygen under standard conditions?

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

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How does the understanding of the role of chemistry in society and the economy affect the development of new products and technologies? Provide specific examples of chemical advancements that have impacted these areas.

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

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