Recent activity by JanisMontane

1 answer 24 views

What is the relationship between the size and shape of nanoparticles and their photochemical properties? Specifically, how does the absorption and emission spectra of gold nanoparticles change as their size and shape are varied?

asked 2 days ago in PhotoChemistry

1 answer 26 views

What is the optimum reaction conditions (temperature, pressure, catalyst, etc.) for the synthesis of polystyrene from styrene monomer to yield a maximum percentage yield and molecular weight?

answered 5 days ago in Chemical synthesis

1 answer 19 views

What is the most efficient and effective method to prepare phenylalanine from benzyl chloride and ammonia, and how can you achieve the highest yield possible?

asked 5 days ago in Chemical synthesis

1 answer 26 views

How does the molecular structure of a dye or pigment affect its photochemical properties and behavior under different light intensities?

answered 6 days ago in PhotoChemistry

1 answer 19 views

What is the predicted reactivity trend for the halogens (Group 17) in terms of their electronic configuration, and how does this trend relate to their ability to gain electrons?

answered Feb 20 in Inorganic Chemistry

1 answer 29 views

What is the effect of different polymer structures on the efficiency of polymer-based photovoltaic cells?

asked Feb 20 in Polymer Chemistry

1 answer 27 views

What is the bond enthalpy of the carbon-carbon double bond (C=C) in ethene (C2H4) when 120 kJ/mol of energy is required to break the bond?

asked Feb 18 in Chemical bonding

1 answer 28 views

How can the yield of polyacrylonitrile production be improved by optimizing reaction conditions, such as temperature, catalyst type and concentration, and monomer feed rate?

asked Feb 13 in Chemical synthesis

1 answer 40 views

How does the doping of graphene affect its electrical conductivity and thermal stability, and how can this information be utilized to enhance its performance as a material for electronic devices?

asked Feb 12 in Materials Chemistry

1 answer 61 views

How can the process of extrusion be optimized to enhance the strength and durability of polymer materials during manufacturing?

asked Feb 10 in Polymer Chemistry

1 answer 28 views

How can the mechanical and thermal properties of different polymers be optimized for their use in 3D printing applications?

answered Feb 7 in Materials Chemistry

1 answer 49 views

How can the efficiency of the process for the production of nitrogen gas be improved without compromising the purity of the final product?

asked Feb 7 in Chemical engineering

1 answer 48 views

How can the desired mechanical and thermal properties of a polymer material be optimized through controlling the manufacturing process parameters such as temperature, pressure, and cooling rate during polymer processing?

answered Feb 7 in Polymer Chemistry

1 answer 37 views

How can polymer chain length distribution be determined using gel permeation chromatography and what are the limitations and advantages of this technique?

asked Feb 5 in Polymer Chemistry

1 answer 32 views

How can chemistry students effectively supplement limited opportunities for hands-on experimentation in order to enhance their understanding of chemical concepts and processes?

answered Feb 4 in Chemical education

1 answer 40 views

Determine the equilibrium constant (Kc) for the chemical reaction: 2 SO2(g) + O2(g) ⇌ 2 SO3(g)Given that at a certain temperature, the concentrations of SO2, O2, and SO3 are 0.25 M, 0.15 M, and 0.40 M, respectively, at equilibrium.

asked Feb 4 in Chemical thermodynamics

1 answer 63 views

What is the coordination number of the metal ion in the active site of carbonic anhydrase, given its crystal structure and the ligands present?

answered Jan 31 in Coordination Chemistry

1 answer 68 views

What is the most stable conformation of 1,2-dichloroethane and how does it affect the molecule's dipole moment? Use computational chemistry and molecular modeling to calculate the energy of different conformations and analyze their dipole moments.

asked Jan 31 in Physical Chemistry

1 answer 92 views

What is the concentration of copper ions (Cu2+) in a water sample if a voltammetry experiment showed a peak current of 0.25 mA at a potential of 0.5 V vs. Ag/AgCl electrode, and the calibration plot showed a linear relationship between peak current and concentration of Cu2+ in the range of 5-50 µM?

asked Jan 30 in Analytical Chemistry

1 answer 60 views

How can the composition and crystalline structure of a mineral sample be determined using X-ray diffraction analysis?

answered Jan 29 in Analytical Chemistry

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