Recent activity by MariettaU10

1 answer 15 views

How do the photochemical properties of R- and S-enantiomers differ from each other and how can these differences be utilized in photodriven processes such as chiral synthesis or resolution?

asked 3 days ago in PhotoChemistry

1 answer 6 views

How does the insulin signaling pathway regulate carbohydrate metabolism in liver cells, and what role do enzymes such as hexokinase and glycogen synthase play in this process?

asked 5 days ago in BioChemistry

1 answer 20 views

What is the coordination number of the complex formed between Ni2+ and ethylenediamine (en)? What is the structure of the complex and is it likely to be tetrahedral or octahedral?

asked 6 days ago in Coordination Chemistry

1 answer 21 views

How does the band gap of a semiconductor material change when doping with impurities such as boron or phosphorus, as predicted by density functional theory calculations?

asked Feb 17 in Computational Chemistry

1 answer 16 views

How does the addition of a catalyst affect the reaction rate of the decomposition of hydrogen peroxide?

asked Feb 17 in Chemical kinetics

1 answer 31 views

What factors affect the rate of a catalytic reaction and how do they impact the performance of the catalyst? Provide examples of different catalytic reactions and explain how the factors at play in each reaction affect the rate of the reaction.

asked Feb 14 in Physical Chemistry

1 answer 33 views

What is the role of hydrogen bonding in maintaining the stability of the double helix structure of DNA?

answered Feb 13 in BioChemistry

1 answer 10 views

How can we design a drug to target the abnormal metabolic processes associated with type 2 diabetes without disrupting other metabolic pathways in the body?

answered Feb 12 in Medicinal Chemistry

1 answer 48 views

How does the coordination chemistry of copper ions in cytochrome c oxidase facilitate the transfer of electrons during the process of aerobic respiration?

asked Feb 12 in Coordination Chemistry

1 answer 32 views

How can the principles of chemical engineering be applied to design a cost-effective and efficient system for treating heavy metal-contaminated wastewater from the electroplating industry? What strategies can be employed to ensure maximum removal of metals such as chromium, cadmium, and lead from the wastewater before it is discharged into the environment?

asked Feb 10 in Chemical engineering

1 answer 29 views

How can the formulation of drug delivery systems be optimized to improve the targeted delivery of therapeutics to specific tissues or organs, while reducing potential adverse effects on non-targeted tissues?

asked Feb 7 in Medicinal Chemistry

1 answer 35 views

How can gel permeation chromatography (GPC) be used to determine the molecular weight distribution of a polymer sample? What are the advantages and limitations of using GPC compared to other polymer characterization techniques?

asked Feb 6 in Polymer Chemistry

1 answer 37 views

How can gel permeation chromatography (GPC) be used to determine the molecular weight distribution of a polymer sample? What are the advantages and limitations of using GPC compared to other polymer characterization techniques?

asked Feb 5 in Polymer Chemistry

1 answer 40 views

Develop a polymer-based composite that can withstand extreme heat and high stress conditions, making it suitable for use in turbine engine components in aerospace applications.

asked Feb 4 in Polymer Chemistry

1 answer 83 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.

answered Jan 31 in Analytical Chemistry

1 answer 60 views

Calculate the enthalpy of adsorption when 2.5 grams of hydrogen gas is adsorbed onto a surface at a temperature of 298 K. The equilibrium pressure of hydrogen gas at this temperature is 1.5 atm and the surface area of the adsorbent is 50 cm². (Assume ideal gas behavior and that the adsorption occurs under standard conditions.)

asked Jan 23 in ThermoChemistry

1 answer 51 views

Calculate the corrosion rate of a copper metal when it is placed in a galvanic couple with zinc metal. The potential difference between the two metals is measured to be 1.5 V and the surface area of the copper metal is 2 cm². The density of copper is 8.96 g/cm³ and its atomic weight is 63.546 g/mol. The atomic weight of zinc is 65.38 g/mol and its density is 7.14 g/cm³. At constant temperature and pressure, assume that the Faraday constant is 96,485 Coulombs/mol and that one mole of electrons is equivalent to one Faraday.

answered Jan 23 in ElectroChemistry

1 answer 63 views

Calculate the bond length between two carbon atoms in ethene (C2H4), given that the distance between the nuclei of the carbon atoms is 1.33 angstroms and the bond angle between them is 121.7 degrees. Use the formula for calculating bond length based on the bond angle and distance between nuclei.

answered Jan 23 in Chemical bonding

1 answer 80 views

A chemistry student needs to find the percent composition of a compound with the empirical formula CCl. The compound has a molar mass of 98.96 g/mol. What is the percent composition of this compound?

asked Jan 22 in Inorganic Chemistry

1 answer 29 views

What is elaborative rehearsal?

asked Jan 20 in Psychology

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