Recent activity by CathrynMacMa

1 answer 20 views

What is the major difference between DNA and RNA? Explain the structural features of both biomolecules that account for their different functions in managing genetic information.

asked Feb 20 in Organic Chemistry

1 answer 32 views

What are the key factors affecting the growth of carbon nanotubes using chemical vapor deposition method, and how can they be optimized to produce longer and more uniform nanotubes with desired properties?

asked Feb 20 in Materials Chemistry

1 answer 34 views

What is the effect of metal complexation on the photochemical properties of a dye molecule? Provide examples of metal-dye complexation and compare their photochemical behavior with the respective uncomplexed dyes.

answered Feb 19 in PhotoChemistry

1 answer 33 views

What is the dipole moment of the hydrogen chloride (HCl) molecule and why is the bond polar?

asked Feb 19 in Chemical bonding

1 answer 23 views

What is the coordination number and geometry of the complex formed between Cu2+ and ethylenediamine (en)?

answered Feb 19 in Coordination Chemistry

1 answer 24 views

What is the balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?

asked Feb 17 in Chemical reactions

1 answer 31 views

What chemical modifications occur during RNA splicing, and what impact do they have on the function and stability of the resulting mRNA molecule?

answered Feb 14 in BioChemistry

1 answer 24 views

How do POPs affect the food chain and what are the potential risks to human health from consuming contaminated food?

answered Feb 14 in Environmental Chemistry

1 answer 69 views

What would be the effect of increasing the pH from 2 to 4 on the equilibrium position of the redox reaction between Fe2+ and MnO4- in acidic solution?

asked Feb 13 in Chemical equilibrium

1 answer 62 views

What is the number of electrons transferred in the following electrochemical reaction: Cu(s) + 2Ag+(aq) -> Cu2+(aq) + 2Ag(s) (Note: the standard reduction potentials of Cu2+(aq)/Cu(s) and Ag+(aq)/Ag(s) are 0.34V and 0.80V, respectively)

asked Feb 13 in ElectroChemistry

1 answer 72 views

What is the basicity of ethylamine compared to ammonia? Justify your answer with the help of relevant chemical equations and explain the trend in basicity of primary, secondary and tertiary amines.

answered Feb 13 in Organic Chemistry

1 answer 43 views

How can the surface properties of a biomaterial be modified to enhance its biocompatibility and reduce the risk of rejection by the human body's immune system?

asked Feb 11 in Surface Chemistry

1 answer 47 views

How can the formulation of drug delivery systems be optimized to improve the efficacy of a specific drug for a particular medical condition while minimizing potential side effects?

asked Feb 7 in Medicinal Chemistry

1 answer 42 views

How can the design of a lubricant production system be optimized for the efficient and cost-effective production of high-quality lubricants, while minimizing waste and environmental impact?

answered Feb 6 in Chemical engineering

1 answer 43 views

How can chemistry educators overcome the challenges of insufficient funding to provide sufficient resources and engage students in learning and understanding chemistry concepts?

answered Feb 4 in Chemical education

1 answer 87 views

Calculate the standard enthalpy change for the reaction: CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g) Given the necessary bond enthalpies are: C-H = 411 kJ/molO=O = 495 kJ/molO-H = 463 kJ/molC=O = 799 kJ/mol.

asked Feb 3 in Quantum Chemistry

1 answer 79 views

Calculate the standard enthalpy change (∆H°) for the precipitation reaction between aqueous solutions of lead(II) nitrate [Pb(NO3)2] and potassium iodide (KI) producing solid lead(II) iodide (PbI2) and aqueous potassium nitrate (KNO3) at a temperature of 25°C.

answered Feb 3 in Chemical thermodynamics

1 answer 64 views

Calculate the standard enthalpy change (∆H°) for the formation of ammonia (NH3) at 298 K using the following data: N2(g) + 3H2(g) → 2NH3(g) ∆H° = −92.4 kJ/mol Hint: Standard enthalpy change (∆H°) for a reaction is calculated by taking the sum of the standard enthalpies of the products minus the sum of the standard enthalpies of the reactants.

asked Feb 3 in Chemical thermodynamics

1 answer 66 views

How will changing the pH affect the formation of a complex ion between Fe³⁺ and CN⁻ in a solution containing both species at equilibrium? Provide a theoretical explanation supported by relevant chemical equations and calculations.

answered Feb 3 in Chemical equilibrium

1 answer 94 views

What is the concentration of lead ions in a water sample collected from a contaminated site? Use atomic absorption spectroscopy to quantify the lead ions in the sample and report your results in ppm.

asked Jan 31 in Analytical Chemistry

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