Recent activity by HenryCharles

1 answer 46 views

What is the purity of a solid sample of aspirin, and does it meet the purity requirements for use in medicines, if it has a melting point range between 134-136°C?

asked Feb 22 in Analytical Chemistry

1 answer 43 views

How does the nature of chemical bonding in a molecule affect its molecular structure?

answered Feb 21 in Chemical education

1 answer 41 views

What is the mechanism involved in the catalytic reaction of hydrogenation of ethylene over a platinum catalyst, and how does the morphology and crystallographic orientation of the platinum catalyst affect its activity and selectivity?

asked Feb 20 in Surface Chemistry

1 answer 34 views

How does the incorporation of different dopants affect the electrical conductivity and mechanical flexibility of conductive polymers, and what is the optimal dopant concentration needed to achieve the desired properties for use in flexible electronics?

asked Feb 20 in Materials Chemistry

1 answer 30 views

What is the effect of different solvents on the photochemical properties (fluorescence and excitation spectra) of a fluorescent dye?

asked Feb 19 in PhotoChemistry

1 answer 29 views

What is the effect of different photosensitizers on the rate of photochemical reactions?

asked Feb 19 in PhotoChemistry

1 answer 30 views

How does the coordination chemistry of iron in hemoglobin affect its ability to bind oxygen and transport it throughout the body?

answered Feb 19 in Coordination Chemistry

1 answer 41 views

How does the accuracy of Density Functional Theory (DFT) calculations affect the prediction of surface properties in catalysis reactions?

answered Feb 17 in Computational Chemistry

1 answer 72 views

How can we use gel permeation chromatography (GPC) to determine the molecular weight distribution of a polymer sample?

answered Feb 13 in Polymer Chemistry

1 answer 71 views

How can the process for producing fragrances be optimized to reduce environmental impact and increase efficiency while maintaining the quality of the final product?

answered Feb 10 in Chemical engineering

1 answer 34 views

How can the design and synthesis of a polymer-based sensor or actuator be optimized for maximum sensitivity and efficiency?

asked Feb 6 in Polymer Chemistry

1 answer 36 views

How can computational chemistry and molecular modeling help in predicting the behavior of molecules in reactions and designing new molecules with specific properties?

answered Feb 5 in Physical Chemistry

1 answer 32 views

How can small molecule inhibitors target specific immune cells and modulate their activity to treat autoimmune diseases?

asked Feb 5 in Medicinal Chemistry

1 answer 50 views

Consider the reaction A + B ⇌ C + D, which has an equilibrium constant of 2.0 x 10^-3 at a given temperature. Initially, 0.10 mol of A and 0.20 mol of B are placed in a flask. Calculate the equilibrium concentrations of all species in the flask.

asked Feb 3 in Chemical equilibrium

1 answer 73 views

Calculate the surface tension of water at a temperature of 25°C using the capillary rise method, given that the diameter of the capillary tube is 0.8 mm and the rise of water in the tube is 3 cm.

asked Feb 3 in Surface Chemistry

1 answer 60 views

Calculate the standard entropy change for the reaction below at a temperature of 298 K:CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) The standard molar entropies are as follows: S(CH4) = 186.3 J K^-1 mol^-1S(O2) = 205.0 J K^-1 mol^-1S(CO2) = 213.7 J K^-1 mol^-1S(H2O) = 188.8 J K^-1 mol^-1

asked Feb 3 in Chemical thermodynamics

1 answer 69 views

Calculate the standard electrode potential of the following cell reaction at 25°C: Cu(s) | Cu2+ (0.01 M) || Zn2+ (1.0 M) | Zn(s)

answered Feb 3 in ElectroChemistry

1 answer 107 views

What is the chemical structure of an unknown compound if its proton NMR spectrum displays a triple peak at δ 1.2, a singlet peak at δ 2.0, a doublet peak at δ 3.6, and a quartet peak at δ 7.5?

answered Jan 30 in Analytical Chemistry

1 answer 38 views

Calculate the equilibrium constant, Kc, at 298 K for the reaction 2 SO2(g) + O2(g) ⇌ 2 SO3(g) when the initial concentrations of SO2, O2, and SO3 are 0.100 M, 0.200 M, and 0.300 M, respectively.

asked Jan 23 in Chemical equilibrium

1 answer 102 views

A chemistry student is given an unknown compound and is asked to identify its molecular formula using mass spectrometry. The compound has a molecular ion peak at m/z 86 and fragments at m/z 43 and 58. What is the molecular formula of the unknown compound?

answered Jan 22 in Analytical Chemistry

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