Recent activity by NelleVxq8414

1 answer 26 views

What is the relationship between the photochemical properties of a dye or pigment and its color?

asked Feb 24 in PhotoChemistry

1 answer 43 views

What is the relationship between temperature and surface tension of a liquid, and how can it be measured experimentally using a tensiometer?

answered Feb 24 in Surface Chemistry

1 answer 25 views

How does the photochemical behavior of metal complexes change with the nature of ligands used in their synthesis?

answered Feb 22 in PhotoChemistry

1 answer 32 views

What is the optimum reaction temperature and time required for the synthesis of nylon-6,6 from adipic acid and hexamethylenediamine?

asked Feb 22 in Chemical synthesis

1 answer 31 views

How does the molecular structure of a polymer affect its mechanical properties, and how can this be optimized for use in 3D printing applications?

answered Feb 21 in Materials Chemistry

1 answer 27 views

What is the impact of metal substitution on the electronic and magnetic properties of a given metal-organic framework, and how does this vary based on the coordination geometry of the metal ion and the ligand structure?

asked Feb 20 in Quantum Chemistry

1 answer 29 views

How does the electronic structure of transition metal complexes affect their photochemical properties? Provide examples of well-known transition metal complexes and explain how their electronic structures relate to their photochemical properties.

asked Feb 20 in PhotoChemistry

1 answer 44 views

How does the coordination chemistry of metalloenzymes and metalloproteins affect their catalytic activity and selectivity?

asked Feb 19 in Coordination Chemistry

1 answer 39 views

How can we use quantum chemistry methods to predict the selectivity and efficiency of a catalyst in a specific chemical reaction?

asked Feb 14 in Quantum Chemistry

1 answer 13 views

How do persistent organic pollutants (POPs) affect the soil quality in agricultural areas and what can be done to mitigate their impact on crop production and human health?

asked Feb 14 in Environmental Chemistry

1 answer 60 views

How can we improve the efficiency of polymer-based membranes for water treatment through modification of their surface properties?

asked Feb 13 in Polymer Chemistry

1 answer 37 views

How can the compatibility between two polymer blend components be improved to enhance the mechanical properties of the resulting blend?

asked Feb 6 in Polymer Chemistry

1 answer 67 views

How does changing the pH affect the equilibrium constant (Kf) for the formation of Fe(CN)6 4- complex ion in a solution containing Fe3+ and CN- ions? Provide a detailed explanation of the effect of pH on the equilibrium constant for the reaction.

asked Feb 3 in Chemical equilibrium

1 answer 101 views

What is the molecular structure and geometry of carbon dioxide according to quantum mechanics principles?

asked Jan 31 in Physical Chemistry

1 answer 132 views

Design a heat exchanger to cool down a mixture of water and ethylene glycol from 80°C to 20°C using cooling water from a nearby lake that enters at 15°C. The mixture flow rate is 10 L/min, and the desired outlet temperature is 20°C. The heat transfer coefficient for the heat exchanger is 250 W/(m².K) and the overall heat transfer coefficient is to be assumed as 350 W/(m².K). The heat capacity of the mixture is 3.8 kJ/(kg.K) and the density is 1030 kg/m³. Determine: a) the surface area of the heat exchanger required for this process,b) the volume flow rate of cooling water required, and c) the overall heat transfer rate in kW.

answered Jan 30 in Chemical engineering

1 answer 77 views

What is the concentration in molarity of a hydrochloric acid solution if it requires 25 mL of a 0.1 M sodium hydroxide solution to neutralize 20 mL of the acid solution?

answered Jan 30 in Analytical Chemistry

1 answer 122 views

What functional groups are present in compound X, and what are their respective absorption frequencies in infrared spectroscopy? How can this information be used to determine the identity of compound X?

answered Jan 30 in Analytical Chemistry

1 answer 76 views

Calculate the amount of heat energy needed to melt a 25-g ice cube at its melting point of 0°C. The enthalpy of fusion of water is 6.01 kJ/mol.

asked Jan 23 in ThermoChemistry

1 answer 95 views

What is the pH of 0.1 M solution of HCl knowing that its dissociation constant is 1.3 x 10^-4?

answered Jan 22 in Inorganic Chemistry

1 answer 112 views

What is the oxidation state of carbon in methanol (CH3OH)?

asked Jan 21 in Organic Chemistry

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