Recent activity by DanielleSauc

1 answer 25 views

What type of reactor design would be best suited for the production of hydrogen gas via steam reforming of natural gas, and what are the specific design parameters that need to be optimized to achieve maximum yield and efficiency of the reaction?

answered 3 days ago in Chemical engineering

1 answer 27 views

How does the critical temperature of superconducting materials vary with changes in their chemical composition and crystal structure?

answered 6 days ago in Materials Chemistry

1 answer 20 views

How does the addition of boron and nitrogen atoms affect the properties of graphene, and how can this information be used to improve the performance of electronic devices using graphene?

answered Feb 17 in Materials Chemistry

1 answer 6 views

How does the activation of the adenylate cyclase enzyme affect the cAMP-dependent signal transduction pathway in the cell?

answered Feb 17 in BioChemistry

1 answer 36 views

What is the activation energy for the reaction between hydrochloric acid and sodium hydroxide? Support your answer with a calculation.

answered Feb 17 in Chemical reactions

1 answer 37 views

How does the acidity/basicity of an ionic liquid affect its electrical conductivity and viscosity?

answered Feb 17 in Physical Chemistry

1 answer 29 views

How does surface modification of biomaterials affect protein adsorption?

asked Feb 17 in Surface Chemistry

1 answer 4 views

How can we use structure-based drug design approaches to develop more effective chemotherapeutic agents for the treatment of breast cancer?

asked Feb 14 in Medicinal Chemistry

1 answer 26 views

What is the structural difference between the heterocyclic compounds pyridine and pyrrole, and how does it affect their physical and chemical properties?

answered Feb 14 in Organic Chemistry

1 answer 34 views

What are the key properties that make polymer-based electronic materials suitable for use in flexible and portable electronic devices?

answered Feb 14 in Polymer Chemistry

1 answer 27 views

What is the role of metalloenzymes in cellular processes? Provide at least three examples of metalloenzymes and explain their functions in detail.

asked Feb 13 in Coordination Chemistry

1 answer 32 views

How can medicinal chemists modify existing antibiotics to combat drug-resistant bacteria strains?

answered Feb 6 in Medicinal Chemistry

1 answer 47 views

Here's a precise problem for a chemistry student to solve:Using Hess's Law, calculate the enthalpy change for the reaction where 2 moles of methane (CH4) reacts with 4 moles of oxygen gas (O2) to form 2 moles of carbon dioxide (CO2) and 4 moles of water (H2O), given the following known enthalpy changes:ΔH1 = -890 kJ/mol for the reaction: CH4 + 2O2 → CO2 + 2H2OΔH2 = -394 kJ/mol for the reaction: C + O2 → CO2ΔH3 = -286 kJ/mol for the reaction: H2 + (1/2)O2 → H2O

asked Feb 4 in Chemical reactions

1 answer 52 views

Determine the acidity or basicity of the following molecules: ammonia (NH3), hydrogen chloride (HCl), water (H2O), and carbon dioxide (CO2). Rank them in order of increasing acidity or increasing basicity and explain your reasoning.

asked Feb 4 in Chemical bonding

1 answer 55 views

Design a distillation column that can effectively separate a mixture containing 50 wt% methanol and 50 wt% water. The column should produce a distillate with no more than 5 wt% methanol and a bottom product with no more than 2 wt% water. The feed rate is 1000 kg/h and the column must operate at atmospheric pressure. Assume that the feed is a saturated liquid and that the methanol-water mixture behaves as an ideal solution. Provide the design specifications for the column, including the number of trays or packing height, diameter, and other necessary specifications.

answered Feb 3 in Chemical engineering

1 answer 30 views

Calculate the standard enthalpy of formation of water (H2O) given the following information: ΔHf° of H2(g) = 0 kJ/molΔHf° of O2(g) = 0 kJ/molΔHf° of H2O2(l) = -188.2 kJ/mol

asked Feb 3 in ThermoChemistry

1 answer 48 views

Calculate the standard enthalpy change of the reaction NH3(g) + 2O2(g) → NO2(g) + 3H2O(l) at 25°C, given that the standard enthalpies of formation of NH3(g), O2(g), NO2(g) and H2O(l) are -46.11 kJ/mol, 0 kJ/mol, 33.18 kJ/mol and -285.8 kJ/mol, respectively.

asked Feb 3 in Quantum Chemistry

1 answer 56 views

Calculate the standard enthalpy change of formation for ethanoic acid, given the following standard enthalpy of combustion data:- Ethanol: -1367 kJ/mol- Carbon dioxide: -393.5 kJ/mol- Water: -285.8 kJ/molThe chemical equation for the formation of ethanoic acid is:2C2H5OH + 2O2 → 2CH3COOH + 2H2O

answered Feb 3 in Chemical thermodynamics

1 answer 28 views

Calculate the standard enthalpy change for the phase transition of solid copper to liquid copper given the following data: - the melting point of copper is 1,085°C - the molar heat of fusion of copper is 13.1 kJ/mol.

asked Feb 3 in Chemical thermodynamics

1 answer 13 views

How can capillary electrophoresis be used to determine the composition of a sample containing multiple ions and molecules? What are the factors that need to be considered while selecting the running buffer and other parameters for the analysis? How does the choice of detector affect the accuracy and sensitivity of the analysis? Moreover, how can the obtained information be used to identify and quantify the various species present in the sample?

asked Jan 29 in Analytical Chemistry

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