Recent activity by SelmaBumgarn

1 answer 15 views

What is the power output of a lithium-ion battery if the battery has an electrode potential of 3.7 volts and a current flow of 2 amperes?

answered 3 days ago in ElectroChemistry

1 answer 17 views

What is the optimal reaction temperature and reaction time required for the synthesis of polyvinyl chloride from vinyl chloride monomer with the highest possible yield and purity?

asked 4 days ago in Chemical synthesis

1 answer 15 views

What is the net ATP yield from the complete oxidation of one molecule of glucose in glycolysis?

answered 4 days ago in BioChemistry

1 answer 25 views

How does the molecular structure of conductive polymers affect their conductivity and mechanical properties, and how can this knowledge be applied to the design of more efficient and durable flexible electronic devices?

asked 4 days ago in Materials Chemistry

1 answer 19 views

How do the magnetic properties (i.e. coercivity, remanence, and hysteresis) of different materials (e.g. iron oxide, cobalt, nickel) affect their suitability for use in data storage?

answered 5 days ago in Materials Chemistry

1 answer 30 views

What are the possible resonance structures for the carbonate ion (CO3^2-)? Draw all the structures and explain why resonance occurs in this molecule.

answered Feb 18 in Chemical bonding

1 answer 35 views

How does temperature affect the reaction rate and mechanism of a chemical reaction, as predicted by quantum mechanical calculations?

answered Feb 17 in Quantum Chemistry

1 answer 33 views

How does the surface modification of polymers affect their hydrophobicity and adhesion properties?

asked Feb 17 in Surface Chemistry

1 answer 32 views

What are the mechanical and thermal properties of polymer nanocomposites filled with Carbon Nanotubes and how do they differ from traditional polymer composites filled with micro fillers?

answered Feb 14 in Polymer Chemistry

1 answer 49 views

How does an increase in nutrient levels contribute to eutrophication in aquatic ecosystems, and what are the chemical processes involved? How can these chemical processes be harnessed to mitigate the effects of eutrophication on the environment?

asked Feb 13 in Environmental Chemistry

1 answer 10 views

How can the production efficiency of surfactants be improved by designing an optimized system that enhances the mixing, heat transfer, and chemical reactions within the reactor?

asked Feb 10 in Chemical engineering

1 answer 40 views

How can the efficiency of the production process for detergents be optimized while minimizing environmental impact?

asked Feb 7 in Chemical engineering

1 answer 61 views

Here is a problem related to BET theory of multilayer adsorption for a chemistry student to solve:How many layers of nitrogen molecules can be adsorbed on the surface of a given amount of activated carbon if the monolayer coverage is 100 m²/g and the specific surface area of activated carbon is 1500 m²/g according to the BET theory?

asked Feb 4 in Surface Chemistry

1 answer 46 views

Calculate the standard enthalpy change for the vaporization of 25.0 g of water at 100°C, given that the molar enthalpy of vaporization of water is 40.7 kJ/mol. (The molar mass of water is 18.015 g/mol.)

asked Feb 3 in Chemical thermodynamics

1 answer 85 views

What are the lipid components of cell membranes and how do they contribute to the membrane's structure and function?

answered Jan 31 in BioChemistry

1 answer 91 views

What actions can be taken by chemistry students and educators to address the limited availability of chemistry textbooks and resources in developing countries?

asked Jan 30 in Chemical education

1 answer 66 views

What is the amount (in moles) of calcium carbonate in a 7.25 g sample of limestone if the gravimetric analysis found that the sample contained 65.2% calcium carbonate?

answered Jan 30 in Analytical Chemistry

1 answer 47 views

Calculate the heat released when 50 ml of 0.1 M HCl is neutralized with 50 ml of 0.1 M NaOH, assuming that the specific heat capacity of the mixture is 4.18 J/g°C and the density of the final solution is 1.0 g/mL.

answered Jan 23 in ThermoChemistry

1 answer 59 views

Calculate the Gibbs free energy change for the electrochemical reaction where Fe(s) is oxidized to Fe3+(aq) and Br2(l) is reduced to Br-(aq) with the help of the following half-reactions: Fe3+(aq) + e- ⇌ Fe2+(aq) E° = 0.771 VBr2(l) + 2e- ⇌ 2Br-(aq) E° = 1.087 V

answered Jan 23 in ElectroChemistry

1 answer 43 views

Calculate the enthalpy change (in kJ/mol) for dissolving 10 grams of NaOH in 100 mL of water at 25°C, given that the molar heat of solution for NaOH is -444.6 kJ/mol.

asked Jan 23 in ThermoChemistry

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