Recent activity by Melanie86K41

1 answer 30 views

What is the rate law expression for the reaction A + 2B → C, if the reaction is second order with respect to A and first order with respect to B? Also, write down the overall order of the reaction.

asked Feb 22 in Physical Chemistry

1 answer 26 views

How do the electronic properties of a material change with different chemical functionalization techniques and how can those changes be accurately predicted using density functional theory calculations?

answered Feb 20 in Computational Chemistry

1 answer 35 views

What is the bond angle in a water molecule (H2O) and how can it be predicted using the VSEPR (Valence Shell Electron Pair Repulsion) theory?

asked Feb 18 in Chemical bonding

1 answer 28 views

How does the addition of other elements such as nitrogen, boron or sulfur affect the electronic properties of graphene and its potential use in electronic devices?

asked Feb 17 in Materials Chemistry

1 answer 27 views

How does the addition of a catalyst affect the reaction rate of the decomposition of hydrogen peroxide, and how can this be measured experimentally using a gas collection method?

asked Feb 17 in Chemical kinetics

1 answer 24 views

How does quantum coherence and entanglement affect the behavior and properties of molecular and nanoscale systems, and how can this understanding be applied to designing more efficient and precise chemical reactions?

asked Feb 14 in Quantum Chemistry

1 answer 33 views

How can we optimize the design of a cosmetic production system to minimize waste and increase efficiency while ensuring the quality and safety of the final product?

asked Feb 14 in Chemical engineering

1 answer 68 views

What is the net ATP production and electron carrier utilization by the end of the citric acid cycle and oxidative phosphorylation for one molecule of glucose in eukaryotic cells?

asked Feb 13 in BioChemistry

1 answer 64 views

What is the role of histones in the regulation of DNA transcription and how do chemical modifications to histones affect this process?

answered Feb 13 in BioChemistry

1 answer 28 views

How can the environmental impact of an industrial project be quantitatively measured and analyzed by using chemical indicators?

asked Feb 7 in Environmental Chemistry

1 answer 38 views

How can chemistry teacher education be improved to better prepare teachers to effectively teach complex concepts and help students develop a strong foundation in chemistry?

answered Feb 5 in Chemical education

1 answer 65 views

Calculate the standard enthalpy change for the neutralization of 50.0 mL of 0.100 M hydrochloric acid with 50.0 mL of 0.100 M sodium hydroxide, assuming that the specific heat capacity of the resulting solution is 4.18 J/g °C and the density of the solution is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics

1 answer 72 views

Calculate the standard electrode potential for the redox reaction 2Fe2+(aq) + Cl2(g) → 2Fe3+(aq) + 2Cl−(aq) given that the standard reduction potential for Fe3+/Fe2+ couple is +0.771 V and E° for Cl2/Cl− couple is +1.36 V.

asked Feb 3 in Chemical thermodynamics

1 answer 70 views

Calculate the pH of a 0.1 M solution of acetic acid (Ka = 1.8 x 10^-5).

answered Feb 3 in Chemical reactions

1 answer 103 views

Question: A chemistry student wants to determine the concentration of copper (II) ions in a water sample. The student has access to a UV-Vis spectrophotometer and a copper (II) sulfate standard solution. Outline the steps the student should take to quantify the concentration of copper (II) ions in the water.

answered Jan 30 in Analytical Chemistry

1 answer 79 views

Calculate the enthalpy of adsorption for the adsorption of hydrogen gas onto a nickel surface at 25°C, given that the equilibrium pressure of hydrogen gas is 0.5 atm and the surface coverage is 0.2 monolayers. The heat of dissociation of hydrogen gas is 436 kJ/mol.

asked Jan 23 in ThermoChemistry

1 answer 52 views

Calculate the enthalpy change of polymerization for the formation of polystyrene from its monomer, styrene, given the following data:- ΔH°f (Styrene) = -25.68 kJ/mol- Bond enthalpies: C-C = 347 kJ/mol; C=C = 611 kJ/mol; C-H = 413 kJ/mol

answered Jan 23 in ThermoChemistry

1 answer 77 views

Calculate the bond energy required to break the carbon-carbon single bond in methane (CH4).

answered Jan 23 in Chemical reactions

1 answer 65 views

A student performs a chemical reaction in which the theoretical yield of a particular product is 25 grams. After carrying out the reaction, the student recovers only 18 grams of the product. What is the percent yield of the reaction?

asked Jan 22 in Chemical reactions

1 answer 105 views

What is the product obtained when 3-methyl-1-phenylpropanal is heated with Tollen's reagent?

answered Jan 21 in Organic Chemistry

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