Recent activity by LawrenceShel

1 answer 35 views

How do the size and shape of quantum dots affect their photochemical properties, such as absorption and emission spectra, quantum yield, and stability?

answered Feb 24 in PhotoChemistry

1 answer 25 views

What is the Faraday constant and how can it be calculated from experimental data of electrolysis of nickel (II) sulfate using a current of 2.0 A for a duration of 2.5 hours, where the mass of nickel deposited on the cathode is known to be 0.245 g?

asked Feb 20 in ElectroChemistry

1 answer 35 views

How does the electrokinetic potential affect the stability of colloidal systems and what is the mechanism behind it?

asked Feb 20 in Surface Chemistry

1 answer 35 views

What is the mechanism of the conversion of 2-methylpropylbenzene and carbon dioxide into ibuprofen in the presence of a catalyst, and how can the yield of ibuprofen be optimized?

answered Feb 19 in Chemical synthesis

1 answer 32 views

What is the balanced chemical equation for the combustion of methane (CH4)?

answered Feb 17 in Chemical reactions

1 answer 32 views

How does the addition of a strong base affect the percentage of ionization of a weak acid, such as acetic acid, in a solution with an initial concentration of 0.1 M?

answered Feb 17 in Chemical equilibrium

1 answer 36 views

How does the addition of a strong acid or base affect the ionization of a weak acid or base and what is the resulting change in equilibrium concentration of ions in a solution? Provide an example with relevant calculations.

answered Feb 17 in Chemical equilibrium

1 answer 32 views

How does surface modification of polymers using plasma treatment impact the surface energy and wettability of the polymer?

answered Feb 17 in Surface Chemistry

1 answer 44 views

What methods can be used to predict the crystal structure of inorganic solids, and how can these methods be confirmed experimentally?

answered Feb 14 in Inorganic Chemistry

1 answer 45 views

How does histone modification affect DNA-protein interactions and gene expression?

answered Feb 13 in BioChemistry

1 answer 73 views

What are the critical steps and parameters to consider when developing a process for the production of a pharmaceutical drug using chemical engineering principles? How can we ensure the final product is safe, effective, and cost-efficient?

answered Feb 12 in Chemical engineering

1 answer 40 views

How can different types of diisocyanates and polyols be optimally combined to synthesize polyurethane with desirable mechanical, thermal, and chemical properties?

answered Feb 5 in Chemical synthesis

1 answer 72 views

How can a chemist selectively protect an amine group in the presence of hydroxyl and carboxyl groups when synthesizing a complex organic molecule using protecting groups?

asked Feb 4 in Organic Chemistry

1 answer 85 views

Certainly! Here's a question for the student to solve related to the topic:What is the mechanism of the Pinacol-Pinacolone rearrangement reaction?

asked Feb 3 in Organic Chemistry

1 answer 98 views

What is the percent composition of carbon, hydrogen, and nitrogen in a 10 gram sample of caffeine? Use elemental analysis to determine the answer.

asked Jan 31 in Analytical Chemistry

1 answer 104 views

How do the different factors such as temperature, pressure, and nature of the gas affect the adsorption behavior of a gas on a solid surface? Provide experimental data and theoretical explanations to support your answer.

answered Jan 31 in Physical Chemistry

1 answer 141 views

What steps can be taken in the chemistry field to encourage and support underrepresented groups, such as women and minorities, to pursue careers in chemistry and increase diversity in the field?

answered Jan 30 in Chemical education

1 answer 65 views

Calculate the enthalpy change for the oxidation of 1 mole of methane gas to form carbon dioxide and water vapor, given the following balanced chemical equation: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)(enthalpy of formation: ΔHf(CH4)=-74.81 kJ/mol, ΔHf(CO2)=-393.51 kJ/mol, ΔHf(H2O)= -241.83 kJ/mol)

asked Jan 23 in ThermoChemistry

1 answer 109 views

A student needs to determine the standard electrode potential for the following reaction: Fe3+ + e- → Fe2+ Using the standard electrode potentials of Fe3+/Fe2+ and Ag+/Ag, calculate the standard cell potential for the following reaction: 2Ag+ (aq) + Fe(s) → 2Ag(s) + Fe2+ (aq) Determine if this reaction is spontaneous or nonspontaneous under standard conditions.

answered Jan 22 in ElectroChemistry

1 answer 64 views

What is the difference between stress and stressors?

answered Jan 20 in Psychology

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