Recent activity by QAMSibyl4514

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How does the photochemical properties of dyes and pigments affect their coloring abilities and photostability?

1 answer 20 views

How does the photochemical activity of silver nanoparticles with different sizes vary, and how does this affect their potential application in photocatalysis?

answered 4 days ago in PhotoChemistry

1 answer 14 views

What is the optimum Si/Al ratio needed for the catalytic cracking of hydrocarbons in zeolites using computational chemistry techniques?

answered 4 days ago in Computational Chemistry

1 answer 28 views

What is the maximum theoretical yield of aspirin that can be obtained from the reaction between salicylic acid and acetic anhydride, and how does the presence of impurities affect the actual yield achieved in the reaction?

answered 5 days ago in Chemical synthesis

1 answer 31 views

What is the maximum amount of work that can be obtained from a chemical reaction at constant temperature and pressure, assuming perfect reversibility and no external work?

answered 5 days ago in Physical Chemistry

1 answer 27 views

How does the electrophilic addition of HBr to propene occur in the presence of a peroxide catalyst and what is the mechanism behind it?

answered 6 days ago in Organic Chemistry

1 answer 18 views

What would be the effect on the equilibrium constant (Kc) for a reaction if the temperature is increased from 25°C to 35°C? Provide reasons for the observed effect based on Le Chatelier's Principle.

asked 6 days ago in Chemical equilibrium

1 answer 22 views

What is the coordination geometry of the complex [Cu(NH3)4]SO4? Use UV-Vis spectroscopy to determine the nature of the ligand-metal coordination bond and its bonding energy.

answered 6 days ago in Coordination Chemistry

1 answer 26 views

What is the balanced redox reaction for the combustion of methane (CH4) in the presence of oxygen (O2) to form carbon dioxide (CO2) and water (H2O)?

answered Feb 17 in Chemical reactions

1 answer 44 views

What is the hybridization state of the carbon atoms in benzene and how does it contribute to the stability of the molecule?

answered Feb 13 in Organic Chemistry

1 answer 10 views

How can we design drugs with high specificity to target a particular enzyme or receptor site, while avoiding potential off-target effects?

answered Feb 12 in Medicinal Chemistry

1 answer 32 views

How can the synthesis and purification of essential oils through steam distillation be optimized to develop a cost-effective process for the production of fragrances in the chemical industry?

asked Feb 11 in Chemical engineering

1 answer 29 views

How can chemistry teachers provide adequate support for students with learning disabilities to ensure they have equal opportunities to succeed in the subject?

answered Feb 6 in Chemical education

1 answer 35 views

How can researchers modify existing antibiotics to combat drug-resistant bacteria and what are the challenges associated with this approach?

asked Feb 5 in Medicinal Chemistry

1 answer 23 views

How can benzyl chloride and ammonia be reacted to synthesize phenylalanine, and what are the specific conditions (such as temperature and pressure) required for this reaction to occur?

answered Feb 4 in Chemical synthesis

1 answer 62 views

Does changing the concentration of reactants affect the reaction rate and ultimately, the profitability of the reaction in the synthesis of a particular chemical compound? If so, what is the optimal concentration of reactants that maximizes both the reaction rate and profitability?

asked Feb 4 in Chemical kinetics

1 answer 66 views

Calculate the standard heat of mixing when 50 mL of 1 M HCl is mixed with 100 mL of 1 M NaOH at 25°C. The standard heat of neutralization of 1 M HCl and 1 M NaOH is -57.32 kJ/mol.

asked Feb 3 in ThermoChemistry

1 answer 58 views

How can a chemistry student effectively learn and practice laboratory techniques when access to laboratory equipment and facilities is limited?

answered Jan 30 in Chemical education

1 answer 59 views

Calculate the enthalpy of solution (in kJ/mol) for dissolving 10.0 g of NaOH(s) in 100.0 g of water at 25°C, given that the final temperature of the solution is 28.5°C and the heat capacity of the solution is 4.18 J/g°C.

answered Jan 23 in ThermoChemistry

1 answer 57 views

What is the main criticism of existential psychology?

asked Jan 17 in Psychology

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