Recent activity by EarleneKnott

1 answer 24 views

What is the mechanism for the reaction between ethene and hydrogen bromide, and what is the nature of the intermediate(s) involved in this reaction?

answered 3 days ago in Organic Chemistry

1 answer 12 views

What is the optimal reaction conditions (temperature, pressure, and concentration) for the preparation of phenylalanine from benzyl chloride and ammonia, and how do these conditions affect the yield and purity of the final product?

answered 3 days ago in Chemical synthesis

1 answer 18 views

How does the molecular weight of a polymer affect its suitability for use in 3D printing, and what methods can be used to control and optimize the molecular weight for this application?

answered 4 days ago in Materials Chemistry

1 answer 15 views

How does the metabolic pathway of glucose differ between a normal cell and a cancerous cell, and what potential targets can be identified for cancer treatment based on this difference?

answered 4 days ago in BioChemistry

1 answer 20 views

How does the degradation of microplastics in marine environments affect the release of harmful chemicals and their potential impact on the health of marine species?

answered 6 days ago in Environmental Chemistry

1 answer 31 views

What is the bond dissociation energy of methane (CH4) at standard conditions (25°C and 1 atm)? Given that the enthalpy change of the reaction CH4(g) → C(g) + 4H(g) is 1665 kJ/mol.

answered Feb 18 in ThermoChemistry

1 answer 30 views

How can we predict the absorption spectra of a molecule using quantum chemical calculations of excited states?

asked Feb 14 in Computational Chemistry

1 answer 54 views

How can we improve the compatibility of polystyrene and polypropylene in polymer blends?

asked Feb 13 in Polymer Chemistry

1 answer 25 views

What is the effect of the popular pesticide glyphosate on human health when ingested through food? What is the mechanism of toxicity and how can it be mitigated?

asked Feb 13 in Environmental Chemistry

1 answer 37 views

How can we design a new drug molecule that selectively targets the immune cells responsible for the development of autoimmune diseases and avoids interfering with healthy cells?

answered Feb 12 in Medicinal Chemistry

1 answer 40 views

What type of inorganic solid is copper (II) sulfate, and what properties can be used to identify its classification as ionic, covalent, or metallic?

answered Feb 12 in Inorganic Chemistry

1 answer 7 views

How do Chlorofluorocarbons (CFCs) interact with ozone molecules and what is the impact of this interaction on the ozone layer? Additionally, what methods can be used to mitigate the negative effects of CFCs on the ozone layer?

answered Feb 12 in Environmental Chemistry

1 answer 35 views

How can the mechanical properties, such as the tensile strength and elasticity, of 3D-printed polymer-based materials be optimized for specific applications?

answered Feb 10 in Polymer Chemistry

1 answer 30 views

How can the magnetic properties of a material be altered to make it more suitable for high-density data storage applications?

asked Feb 7 in Materials Chemistry

1 answer 32 views

How can chemistry students overcome the limited availability of chemistry-related internships and job opportunities to gain the necessary experience for their future careers?

answered Feb 5 in Chemical education

1 answer 70 views

Determine the entropy change for the combustion of methane gas (CH4) at constant pressure and 298 K. Given the standard molar entropy values are: S°(CH4) = 186 J/mol.K, S°(O2) = 205 J/mol.K, S°(CO2) = 214 J/mol.K and S°(H2O) = 188 J/mol.K.

answered Feb 4 in Chemical thermodynamics

1 answer 37 views

Calculate the standard enthalpy of formation (ΔH°f) of carbon dioxide (CO2) at 25°C given the following data:CO(g) + 1/2 O2(g) → CO2(g) ΔH° = -283.3 kJ/molC(s) + O2(g) → CO2(g) ΔH° = -393.5 kJ/molΔH°f (C(s)) = 0 kJ/molΔH°f (O2(g)) = 0 kJ/mol

asked Feb 3 in ThermoChemistry

1 answer 45 views

Calculate the standard enthalpy change for the reaction between [Fe(H2O)6]2+ and 2Cl- ions to produce [FeCl4]2- complex ion given that the enthalpy of formation for [FeCl4]2- is -392 kJ/mol and the enthalpies of hydration for Fe2+ and Cl- ions are -340 kJ/mol and -381 kJ/mol, respectively.

answered Feb 3 in Chemical thermodynamics

1 answer 78 views

How can the chemical engineer design a system that minimizes waste and maximizes efficiency in the production of lubricants, while also meeting the required quality standards for the final product?

asked Jan 30 in Chemical engineering

1 answer 61 views

Calculate the enthalpy change of dissolving 5.00 g of NaOH in 100.0 g of water. The temperature of the resulting solution increases from 25.00°C to 31.50°C. The specific heat capacity of the resulting solution is 4.18 J/g°C.

answered Jan 23 in ThermoChemistry

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