Recent activity by ElviaM111599

1 answer 28 views

What is the coordination geometry and number of the metal center in the active site of hemoglobin?

answered Feb 20 in Coordination Chemistry

1 answer 34 views

What is the major product formed when benzene is treated with a mixture of sulfuric and nitric acid in the presence of concentrated sulfuric acid as a catalyst, and how does the reaction mechanism occur?

asked Feb 20 in Organic Chemistry

1 answer 30 views

How does the inhibition of the enzyme acyl-CoA:cholesterol acyltransferase impact the metabolism and transport of lipids in the human body?

answered Feb 20 in BioChemistry

1 answer 29 views

How has the history and evolution of chemistry contributed to our current understanding of the properties and behavior of elements, and how can this knowledge be applied in modern chemistry research and industry?

asked Feb 20 in Chemical education

1 answer 27 views

What is the dipole moment of a water molecule according to ab initio calculations?

asked Feb 19 in Computational Chemistry

1 answer 40 views

What is the mechanism of the acid-catalyzed cleavage of an ether and how does it differ from the base-catalyzed cleavage of an ether? Provide a step-by-step explanation of the mechanism using a specific example.

asked Feb 17 in Organic Chemistry

1 answer 61 views

How does the heavy metal contamination of soil, specifically lead and cadmium, impact the growth and yield of spinach plants?

asked Feb 13 in Environmental Chemistry

1 answer 69 views

How can the thermal properties of a polymer be analyzed using differential scanning calorimetry (DSC) technique?

asked Feb 12 in Polymer Chemistry

1 answer 31 views

How can we design drugs that target specific neuroreceptors and enhance neurotransmitter signaling for the treatment of Alzheimer's disease?

asked Feb 12 in Medicinal Chemistry

1 answer 58 views

How can we design a drug that specifically targets the opioid receptor to treat chronic pain, while avoiding activation of other receptors in the body that may cause harmful side effects?

asked Feb 12 in Medicinal Chemistry

1 answer 76 views

How can the synthesis of polypropylene from propylene monomer using Ziegler-Natta catalyst be optimized to maximize the yield and improve the polymer properties?

answered Feb 11 in Chemical synthesis

1 answer 39 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 40 views

How can the adhesion properties of a polymer-based adhesive be optimized for bonding to both polar and nonpolar surfaces?

asked Feb 6 in Polymer Chemistry

1 answer 71 views

Here is a problem related to Hess's Law for the student to solve:Suppose you are given the following three equations, each with their respective enthalpy change: (1) 2H2(g) + O2(g) --> 2H2O(l) ΔH₁ = -572 kJ/mol (2) 2H2O(l) --> 2H2(g) + O2(g) ΔH₂ = 472 kJ/mol (3) C(s) + O2(g) --> CO2(g) ΔH₃ = -394 kJ/molUse Hess's law to calculate the enthalpy change (in kJ/mol) for the following reaction: C(s) + 2H2(g) --> CH4(g)

asked Feb 4 in Chemical reactions

1 answer 98 views

What is the effect of changing the chemical composition of a polymer-based membrane on its water treatment efficiency?

answered Jan 31 in Polymer Chemistry

1 answer 71 views

How can voltammetry be used to accurately quantify the concentration of a specific substance in a sample, and what are the key factors that affect the accuracy and precision of this measurement technique?

asked Jan 29 in Analytical Chemistry

1 answer 80 views

Calculate the enthalpy change for the combustion of methane, given the following balanced chemical equation:CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)The enthalpies of formation for methane, carbon dioxide, and water are -74.8 kJ/mol, -393.5 kJ/mol, and -241.8 kJ/mol respectively.

answered Jan 23 in Chemical thermodynamics

1 answer 69 views

Calculate the bond enthalpy for the carbon-oxygen bond in carbon dioxide (CO2) using the following data:- Bond enthalpy of carbon-oxygen double bond = 799 kJ/mol- Bond enthalpy of carbon-oxygen single bond = 358 kJ/molShow all calculations and units.

asked Jan 23 in Chemical bonding

1 answer 66 views

Calculate the bond dissociation energy (in kJ/mol) for the O-H bond in water (H2O) given that the enthalpy change for the reaction H2O (g) → H (g) + OH(g) is +495 kJ/mol and the enthalpy change for the reaction H2(g) + 1/2O2(g) → H2O(g) is -241.8 kJ/mol.

answered Jan 23 in ThermoChemistry

1 answer 128 views

A chemistry student needs to determine the rate constant for the reaction between hydrochloric acid and sodium thiosulfate. If the initial concentration of hydrochloric acid is 0.1 M, the initial concentration of sodium thiosulfate is 0.05 M, and the initial rate of the reaction is 8.7 x 10^-5 mol/L.s, what is the rate constant for this reaction?

asked Jan 22 in Chemical kinetics

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