Recent activity by NicholeBlade

1 answer 17 views

What is the optimal ratio of diisocyanate and polyol required for the synthesis of polyurethane with desired mechanical and thermal properties?

asked 3 days ago in Chemical synthesis

1 answer 19 views

What is the most effective process for producing ammonium nitrate fertilizer from nitrogen gas and ammonia gas, and what are the optimal operating conditions for this process (i.e. temperature, pressure, catalysts, etc.)?

asked 3 days ago in Chemical engineering

1 answer 5 views

What are the most commonly used pesticides in food production and what are their potential negative effects on human health due to pesticide residue buildup in the food chain?

answered 4 days ago in Environmental Chemistry

1 answer 22 views

How does the liver affect the metabolism of different drugs in the body, and what are the specific enzymes involved in this process? Provide a detailed explanation and include examples of drugs that are primarily metabolized by the liver.

answered 4 days ago in Medicinal Chemistry

1 answer 26 views

What is the electronegativity difference between the hydrogen and chlorine atoms in an HCl molecule, and what type of bond do they form?

answered 5 days ago in Chemical bonding

1 answer 20 views

How does the degree of polymerization affect the physical properties of polystyrene, specifically its melting point and glass transition temperature?

answered 5 days ago in Physical Chemistry

1 answer 26 views

How does the coordination chemistry of metalloenzymes and metalloproteins affect their biological function?

answered 6 days ago in Coordination Chemistry

1 answer 38 views

What would be the balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid, and what are the products formed in a double replacement reaction?

asked Feb 17 in Chemical reactions

1 answer 27 views

What is the role of ribosomes in the process of protein synthesis during RNA transcription and translation? Explain the molecular mechanism behind how a ribosome reads the instructions encoded in mRNA and assembles amino acids into a polypeptide chain.

answered Feb 14 in BioChemistry

1 answer 36 views

What is the effect of changing the size and shape of a ligand on the rate of ligand substitution reactions in coordination chemistry?

answered Feb 13 in Coordination Chemistry

1 answer 23 views

What is the standard electrode potential of a copper electrode if it is combined with a zinc electrode in a galvanic cell, and the measured cell potential is 1.10 V at 298 K? Given: E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = 0.34 V.

asked Feb 13 in Physical Chemistry

1 answer 38 views

What is the pH of a 0.1 M solution of HClO4 at 25°C?

asked Feb 13 in Inorganic Chemistry

1 answer 36 views

How can the molecular structure of a drug be modified in the design process to increase its ability to cross the blood-brain barrier and effectively treat neurological disorders?

answered Feb 10 in Medicinal Chemistry

1 answer 44 views

How can the durability and scratch resistance of polymer-based coatings and paints be improved?

asked Feb 7 in Polymer Chemistry

1 answer 38 views

How can the concentration of Persistent organic pollutants (POPs) in water bodies be effectively measured and reduced to mitigate their impact on aquatic organisms and the overall ecosystem?

asked Feb 6 in Environmental Chemistry

1 answer 34 views

How can a heat exchanger be designed for a specific industrial process involving the heating and cooling of a liquid stream with a flow rate of 500L/min and a specific heat capacity of 4.2 kJ/kg K? The temperature of the hot and cold streams are 120°C and 25°C respectively, and the process requires a heat transfer rate of at least 200 kW. What should be the surface area and overall heat transfer coefficient of the heat exchanger to meet the process requirements?

asked Feb 4 in Chemical engineering

1 answer 59 views

Given that the enthalpy of vaporization of water is 40.7 kJ/mol at its boiling point of 100°C, calculate the amount of energy required to boil 500g of water starting from 25°C.

asked Feb 4 in ThermoChemistry

1 answer 48 views

Design a heat exchanger for a specific process that involves heating a liquid from 20°C to 60°C. The liquid has a flow rate of 500 L/hr, and it will be heated by steam at a pressure of 3 bar. The heat transfer coefficient for the steam is 3000 W/(m²·K), and the overall heat transfer coefficient for the heat exchanger is 500 W/(m²·K). Determine the surface area required for the heat exchanger and the flow rate of steam required to heat the liquid.

asked Feb 4 in Chemical engineering

1 answer 38 views

Calculate the standard enthalpy change (∆H°) of combustion for methane gas (CH4) given that the heat of formation (∆Hf°) for methane is -74.87 kJ/mol and the heat of formation (∆Hf°) for carbon dioxide (CO2) is -393.51 kJ/mol, and the heat of formation (∆Hf°) for water (H2O) is -285.83 kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 61 views

What are the vibrational frequencies of carbon dioxide and how do they relate to the molecular geometry of the molecule?

answered Jan 31 in Physical Chemistry

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