Recent activity by JaneenBarrie

1 answer 32 views

What are the primary chemicals responsible for ozone depletion in the atmosphere, and what are the key sources of these chemicals? Additionally, what are some ways we can prevent further damage to the ozone layer and promote its recovery?

answered Feb 22 in Environmental Chemistry

1 answer 23 views

How do the photochemical properties of the photovoltaic material affect the efficiency of a solar cell?

answered Feb 22 in PhotoChemistry

1 answer 32 views

What is the optimum reaction conditions for the preparation of 2,4-dinitrophenol from phenol and nitric acid, including the concentration of the reactants, temperature, and reaction time?

answered Feb 22 in Chemical synthesis

1 answer 33 views

What are the optimal composition and thermal treatment conditions for a titanium alloy that exhibits high strength, low density, and excellent corrosion resistance for use in aerospace applications?

asked Feb 21 in Materials Chemistry

1 answer 33 views

How does the inhibition of the enzyme pyruvate kinase affect the metabolic pathway of glycolysis and what are the regulatory mechanisms involved?

asked Feb 20 in BioChemistry

1 answer 36 views

What is the hybridization of the central atom in carbon dioxide (CO2)?

answered Feb 20 in Chemical bonding

1 answer 37 views

What is the effect of substrate concentration on the rate of enzyme-catalyzed reactions, and how does the presence of an inhibitor (competitive or non-competitive) affect this relationship?

answered Feb 19 in BioChemistry

1 answer 41 views

How does the concentration of Chlorofluorocarbons (CFCs) in the atmosphere correlate with the size of the ozone hole and what are the possible effects on the environment and human health?

answered Feb 18 in Environmental Chemistry

1 answer 33 views

What is the structural difference between the heterocyclic compounds pyridine and pyrrole, and how does it affect their physical and chemical properties?

asked Feb 14 in Organic Chemistry

1 answer 28 views

What is the role of the metal ion in the coordination chemistry of metalloenzymes and metalloproteins, and how does its coordination environment affect enzymatic activity?

answered Feb 13 in Coordination Chemistry

1 answer 62 views

What is the role of metal ions in the active sites of metalloenzymes such as cytochrome c oxidase, and how does the coordination chemistry of these metal ions contribute to the enzyme's catalytic activity?

answered Feb 13 in Coordination Chemistry

1 answer 50 views

What are the hybrid orbitals present in the molecule of formaldehyde (CH2O)?

asked Feb 13 in Chemical bonding

1 answer 65 views

What is the net ATP yield in the glycolysis pathway and how does it compare to the ATP yield in the gluconeogenesis pathway?

answered Feb 13 in BioChemistry

1 answer 42 views

How can the synthesis of polyethylene terephthalate from terephthalic acid and ethylene glycol be optimized to achieve a higher yield and purity of the final product?

answered Feb 11 in Chemical synthesis

1 answer 64 views

How can the synthesis and characterization of novel materials be optimized for energy storage applications in batteries, taking into account factors such as cost, efficiency, and environmental impact?

answered Feb 11 in Materials Chemistry

1 answer 72 views

Design a distillation column that can effectively separate a mixture of 75% ethanol and 25% water with a feed rate of 1000 kg/hr. Your column should produce a distillate with a composition of at least 95% ethanol and a bottom product with no more than 5% ethanol. Assume the feed mixture enters the column at its boiling point and you have access to a cooling water supply at 20°C for the condenser. Provide a detailed design and justification of your column's operating conditions including temperatures, pressures, and flow rates.

asked Feb 3 in Chemical engineering

1 answer 142 views

How does changing the molecular weight of a polymer affect its melt viscosity and how can this be quantitatively measured using rheological measurements such as shear rate and shear stress?

asked Feb 3 in Polymer Chemistry

1 answer 79 views

Calculate the enthalpy of formation of water (H2O) given the enthalpies of formation of hydrogen gas (H2) and oxygen gas (O2) are -286 kJ/mol and 0 kJ/mol, respectively.

asked Jan 23 in ThermoChemistry

1 answer 80 views

Calculate the enthalpy change for the hydrolysis of 0.025 moles of ethyl acetate (C4H8O2) in the presence of excess water, given that the enthalpy of reaction is -56.0 kJ/mol.

asked Jan 23 in ThermoChemistry

1 answer 127 views

A certain metal oxide has an enthalpy of formation of -589.3 kJ/mol. When a 5.60 g sample of this oxide is reduced with excess hydrogen gas, the enthalpy change for the reaction is found to be -129.3 kJ/mol. Calculate the enthalpy of reduction per mole of this oxide.

asked Jan 22 in ThermoChemistry

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