Recent activity by JudithMackni

1 answer 30 views

What is the relationship between light intensity and the rate of photochemical reactions in the presence of a certain photosensitive molecule? How does this relationship vary with changes in the intensity and wavelength of light used?

asked Feb 24 in PhotoChemistry

1 answer 29 views

What is the balanced chemical equation for the preparation of 2,4,6-trinitrotoluene from toluene and nitric acid? Also, calculate the theoretical yield of 2,4,6-trinitrotoluene if 50 grams of toluene and excess nitric acid are used in the reaction.

asked Feb 22 in Chemical synthesis

1 answer 27 views

What is the predicted molecular geometry and polarity of a water molecule?

asked Feb 22 in Inorganic Chemistry

1 answer 32 views

What is the net yield of ATP per one cycle of the Citric Acid Cycle and Oxidative Phosphorylation?

asked Feb 21 in BioChemistry

1 answer 29 views

What is the most efficient method for synthesizing polystyrene from styrene monomer at a large scale while minimizing waste and maximizing yield?

asked Feb 21 in Chemical synthesis

1 answer 36 views

What factors determine the color of inorganic compounds? How can we predict the color of a compound based on its composition and structure?

asked Feb 18 in Inorganic Chemistry

1 answer 34 views

How does the choice of processing technique affect the mechanical properties of a polymer product?

asked Feb 18 in Polymer Chemistry

1 answer 28 views

What is the boiling point of magnesium chloride (MgCl2) if its melting point is -711°C? (Assuming standard pressure and the compound is in its solid form when heated to its boiling point.)

answered Feb 17 in Inorganic Chemistry

1 answer 28 views

How does the adsorption behavior of oxygen molecules on a copper surface change with the surface coverage and the presence of defects, as predicted by density functional theory calculations?

asked Feb 17 in Computational Chemistry

1 answer 25 views

How can we predict the crystal structure of inorganic solids with different compositions and bonding arrangements?

asked Feb 14 in Inorganic Chemistry

1 answer 36 views

How can we design a polymer-based smart material that undergoes a reversible color change in response to changes in temperature?

asked Feb 12 in Polymer Chemistry

1 answer 48 views

How can photochemical processes be utilized to degrade pollutants in the environment such as organic compounds and heavy metals, and what are the factors that affect the efficiency of the degradation process?

asked Feb 5 in PhotoChemistry

1 answer 111 views

Calculate the standard entropy change for the reaction of 2 moles of nitrogen gas reacting with 5 moles of oxygen gas to produce 2 moles of nitrogen monoxide gas at a constant pressure of 1 bar and 298 K. Given the standard molar entropy of nitrogen gas, oxygen gas, and nitrogen monoxide gas to be 191.6 J K-1 mol-1, 205.0 J K-1 mol-1, and 210.6 J K-1 mol-1, respectively.

asked Feb 3 in Chemical thermodynamics

1 answer 56 views

Calculate the standard enthalpy change for the reaction between 50.0 mL of 0.200 M HCl(aq) and 50.0 mL of 0.300 M NaOH(aq) at 25°C. The heat capacity of the calorimeter is 9.60 J/°C and the temperature change observed is 4.00°C. Also, assume that the density of both solutions is 1.00 g/mL and that the heat capacity and density of the final solution are the same as that of water.

answered Feb 3 in Chemical thermodynamics

1 answer 84 views

Calculate the rate constant and the activation energy for the polymerization of styrene at 60°C, given that the rate of polymerization is 2.21 x 10^-3 mol L^-1 s^-1 at an initial concentration of 0.02 mol L^-1 and the activation energy is 101 kJ mol^-1.

asked Feb 3 in Polymer Chemistry

1 answer 83 views

What is the potential toxicity of amoxicillin and how can it be investigated using in vitro and in vivo assays in medicinal chemistry?

asked Jan 31 in Medicinal Chemistry

1 answer 112 views

What is the composition and crystal structure of a mineral sample using X-ray diffraction analysis?

asked Jan 30 in Analytical Chemistry

1 answer 58 views

Calculate the exchange current density for a Zinc electrode immersed in a solution containing 0.1 M Zinc ions at 25 degrees Celsius, given that the standard potential of the Zinc half-reaction is -0.76 V and the transfer coefficient is 0.5. (Assume concentration polarization effects to be negligible.)

answered Jan 23 in ElectroChemistry

1 answer 68 views

Calculate the bond dissociation energy of the carbon-hydrogen bond in methane (CH4), given that the reaction CH4(g) → CH3(g) + H(g) has a ΔH° of 435 kJ/mol.

asked Jan 23 in ThermoChemistry

1 answer 67 views

How does increasing the temperature affect the rate of reaction between sodium thiosulfate and hydrochloric acid?

answered Jan 22 in Chemical kinetics

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