Recent activity by VallieSwaffo

1 answer 28 views

What is the pKa value of acetic acid, and how does it affect its acid strength when compared to other organic acids such as citric acid or benzoic acid? Provide an explanation for your answer using acid-base reaction principles in organic chemistry.

asked Feb 22 in Organic Chemistry

1 answer 27 views

How do the photochemical properties of a dye change when it is exposed to different wavelengths of light?

asked Feb 22 in PhotoChemistry

1 answer 27 views

What is the most efficient and optimal method for the preparation of 2,4-dinitrophenylhydrazine from hydrazine and 2,4-dinitrochlorobenzene, considering yield, purity, and safety measures?

answered Feb 21 in Chemical synthesis

1 answer 26 views

How does the glycolytic pathway regulate glucose metabolism in the human body, and what role does the enzyme phosphofructokinase play in this process?

asked Feb 20 in BioChemistry

1 answer 27 views

What is the effect of temperature on the conductivity of ionic liquids?

answered Feb 20 in Physical Chemistry

1 answer 24 views

What is the bond order of nitrogen molecule (N2) using molecular orbital theory?

answered Feb 18 in Chemical bonding

1 answer 19 views

What is the bond angle in a molecule of ammonia (NH3) and how is it predicted using the theory of valence shell electron pair repulsion (VSEPR)?

asked Feb 17 in Chemical bonding

1 answer 30 views

How does surface modification of biomaterials affect their biocompatibility and cellular interactions?

answered Feb 17 in Surface Chemistry

1 answer 23 views

What factors affect the solubility of an ionic compound in water?

asked Feb 14 in Chemical bonding

1 answer 74 views

What are the effects of different solvents on the properties of a polymer-based coating or paint?

asked Feb 12 in Polymer Chemistry

1 answer 51 views

How can the surface chemistry of adhesives and coatings be optimized to improve their adhesion properties to specific substrates such as metal, glass, or plastic?

asked Feb 11 in Surface Chemistry

1 answer 34 views

How can the magnetic properties of materials be optimized to increase the efficiency of data storage devices, such as hard drives or magnetic tapes?

answered Feb 7 in Materials Chemistry

1 answer 35 views

How can medicinal chemists design drugs to specifically target the lifecycle of the Zika virus while minimizing the risk of harming healthy cells?

asked Feb 6 in Medicinal Chemistry

1 answer 32 views

How can medicinal chemists develop new treatments for skin diseases that are both effective and safe for long-term use?

asked Feb 5 in Medicinal Chemistry

1 answer 42 views

How can computational chemistry be used to determine the binding affinity between a host molecule and guest molecules in supramolecular chemistry?

asked Feb 5 in Computational Chemistry

1 answer 42 views

How can students better understand the specific ways in which chemistry impacts society and the economy, and translate that knowledge into practical applications that benefit individuals and communities?

answered Feb 5 in Chemical education

1 answer 35 views

Consider a closed system undergoing an irreversible expansion at constant pressure, calculate the change in entropy of the system if the initial and final volumes are V1 and V2, respectively, and assuming ideal gas behavior.

answered Feb 3 in Physical Chemistry

1 answer 75 views

Calculate the standard enthalpy change (∆H°) for the dissolution reaction of 5.00 grams of sodium chloride (NaCl) in 100.0 mL of water, given that the final temperature of the solution was 25.0°C and the heat capacity of the solution was 4.18 J/g°C. The molar mass of NaCl is 58.44 g/mol and the density of water is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics

1 answer 105 views

Here's a precise problem for a chemistry student to solve related to enzyme kinetics and inhibition:A researcher wants to determine the Km and Vmax values of an enzyme that catalyzes the conversion of substrate A to product B. They measure the initial reaction rates at varying substrate concentrations and obtain the following data:| [A] (mM) | Initial Reaction Rate (μmol/min) ||----------|---------------------------------|| 1.0 | 0.10 || 2.5 | 0.20 || 5.0 | 0.28 || 10.0 | 0.32 || 20.0 | 0.35

asked Jan 30 in BioChemistry

1 answer 130 views

What is the concentration of iron (Fe) present in a given water sample using colorimetry as the analytical method, given that the absorbance at a wavelength of 565 nm is 0.423 and the molar absorptivity of the Fe-phenanthroline complex is 11,100 M^-1 cm^-1?

answered Jan 30 in Analytical Chemistry

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