Recent activity by SarahWeston5

1 answer 17 views

How does the size and shape of nanoparticles affect their catalytic activity in chemical reactions?

answered 22 hours ago in Materials Chemistry

1 answer 22 views

What are the optimal reaction conditions (temperature, pressure, and concentration) required for the preparation of 2,4-dichloronitrobenzene from nitrobenzene and chlorine gas, and how do these conditions affect the yield of the reaction?

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?

asked 4 days ago in Materials Chemistry

1 answer 27 views

What is the Lewis structure of the methane (CH4) molecule, and how many covalent bonds are formed between each carbon and hydrogen atom?

asked 4 days ago in Chemical bonding

1 answer 15 views

How does a change in pH affect the formation of the complex ion Cu(NH3)4^2+ from Cu2+ and NH3? Provide a detailed explanation with chemical equations and calculations.

asked 5 days ago in Chemical equilibrium

1 answer 21 views

What is the effect of different degrees of crosslinking on the mechanical properties of a polymer utilized in biomedical applications?

answered 5 days ago in Materials Chemistry

1 answer 20 views

What is the critical micelle concentration (CMC) of a given surfactant, and how does changing the temperature and the pH of the solution affect its CMC?

answered 6 days ago in Surface Chemistry

1 answer 15 views

What is the balanced chemical equation for the synthesis reaction of magnesium oxide (MgO) when magnesium (Mg) reacts with oxygen gas (O2)?

asked Feb 17 in Chemical reactions

1 answer 22 views

How does the addition of dopants affect the electronic and optical properties of graphene and other 2D materials, and how can these changes be accurately calculated using quantum chemistry methods?

asked Feb 17 in Quantum Chemistry

1 answer 25 views

What is the effect of surface functional groups (such as -COOH, -NH2, -OH, etc.) on the adhesion strength of a coating to a substrate, and how can this knowledge be used to develop more efficient adhesive and coating materials?

asked Feb 14 in Surface Chemistry

1 answer 20 views

What is the role of snRNPs (small nuclear ribonucleoproteins) in RNA splicing and how do they function in the spliceosome complex?

answered Feb 14 in BioChemistry

1 answer 34 views

What is the difference between primary, secondary, and tertiary amines, and how do their physical and chemical properties differ? Also, explain the various methods of preparation for amines and amides with suitable examples.

answered Feb 14 in Organic Chemistry

1 answer 8 views

How does the surface area of the catalyst impact the rate of reaction in heterogeneous catalysis? Provide specific examples from recent scientific research to support your answer.

answered Feb 13 in Surface Chemistry

1 answer 9 views

How can we design a new cancer drug that targets cancer cells while minimizing harm to healthy cells?

asked Feb 12 in Medicinal Chemistry

1 answer 39 views

How can the principles of chemical engineering be applied to design a cost-effective and efficient system for the treatment of heavy metal wastewater in an industrial setting?

asked Feb 10 in Chemical engineering

1 answer 34 views

How can the photochemical degradation of pollutants in the environment be optimized using titanium dioxide as a photocatalyst?

asked Feb 10 in PhotoChemistry

1 answer 39 views

How can first principles calculations be used to predict the electronic and magnetic properties of topological materials and provide insights into their potential applications in spintronics and quantum computing?

asked Feb 5 in Quantum Chemistry

1 answer 41 views

Calculate the standard enthalpy change for the formation of one mole of methane (CH4) gas given the following information: - Heat of combustion of methane gas is -890.36 kJ/mol - Heat of formation of water (H2O) liquid is -285.83 kJ/mol - Heat of formation of carbon dioxide (CO2) gas is -393.52 kJ/mol

asked Feb 3 in Chemical thermodynamics

1 answer 40 views

Calculate the standard enthalpy change (∆H°) for the reaction of the coordination compound [Co(NH3)6]Cl3 (aq) with NaOH (aq) to produce [Co(NH3)6](OH)3 (aq) and NaCl (aq). Given, the standard enthalpy of formation (∆H°f) for [Co(NH3)6]Cl3, [Co(NH3)6](OH)3 and NaCl are -784.8 kJ/mol, -1273.6 kJ/mol and -411.2 kJ/mol, respectively.

answered Feb 3 in Chemical thermodynamics

1 answer 73 views

Calculate the standard enthalpy change (∆H°) for the dissolution of 5.00 g of solid NaOH in 100.0 mL of water, given that the temperature of the solution increased from 25.0°C to 27.5°C. The density of the solution is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/(g°C). The molar mass of NaOH is 40.00 g/mol.

answered Feb 3 in Chemical thermodynamics

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