Questions by JonelleCouls

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0 answers 16 views

How does the size and shape of graphene nanoparticles affect their electronic and optical properties? And, how can we calculate these properties using quantum chemistry principles?

asked 1 day ago in Quantum Chemistry

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1 answer 28 views

What is the pKa value of acetic acid and how does it affect the acidity of the solution when mixed with a strong base such as sodium hydroxide (NaOH)? Determine the pH of the resulting solution and explain the mechanism of the acid-base reaction.

asked 3 days ago in Organic Chemistry

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1 answer 24 views

What is the optimal ratio of diisocyanate to polyol required for the synthesis of polyurethane with maximum tensile strength and elongation at break?

asked 4 days ago in Chemical synthesis

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1 answer 31 views

What is the effect of varying the ratio of polymer A to polymer B on the compatibility of a polymer blend?

asked Feb 18 in Polymer Chemistry

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1 answer 21 views

How does the calculation of molecular orbitals provide information about the electronic structure and chemical properties of a molecule, and how can this information be used to predict its reactivity in chemical reactions?

asked Feb 18 in Quantum Chemistry

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1 answer 10 views

How can we design drugs to treat metabolic disorders in a way that minimizes unwanted side effects and maximizes therapeutic efficacy?

asked Feb 12 in Medicinal Chemistry

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1 answer 7 views

How can we design drugs that effectively target a specific type of bacteria without harming the beneficial bacteria in the body?

asked Feb 12 in Medicinal Chemistry

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1 answer 27 views

How can the optical properties of a polymer matrix be modified by incorporating different types and quantities of dopants into the structure?

asked Feb 10 in Polymer Chemistry

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1 answer 30 views

How can the critical temperature of a superconducting material be optimized to increase its electrical conductivity and practical applications?

asked Feb 6 in Materials Chemistry

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1 answer 29 views

How can magnetic resonance spectroscopy be used to determine the purity and concentration of a sample of aspirin? Provide a step-by-step explanation of the process and discuss the factors that can affect the accuracy of the results.

asked Feb 6 in Physical Chemistry

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1 answer 33 views

How can magnetic nanoparticles be synthesized and characterized for efficient drug delivery?

asked Feb 5 in Materials Chemistry

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1 answer 33 views

How can a student adequately prepare for a chemistry exam, specifically in the areas of stoichiometry and balancing chemical equations? Provide examples and strategies for improving understanding and retention of these concepts.

asked Feb 4 in Chemical education

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1 answer 57 views

Determine the standard enthalpy change for the precipitation reaction of 10.0 g of calcium chloride (CaCl2) with excess sodium carbonate (Na2CO3) to form calcium carbonate (CaCO3) and sodium chloride (NaCl). Given the following standard enthalpies of formation: ΔHf°(CaCl2) = -795.8 kJ/mol, ΔHf°(Na2CO3) = -1130.1 kJ/mol, ΔHf°(CaCO3) = -1206.9 kJ/mol, and ΔHf°(NaCl) = -411.2 kJ/mol.

asked Feb 4 in Chemical thermodynamics

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1 answer 26 views

Calculate the standard enthalpy change for the reaction between Aquapentamminecobalt(III) chloride and sodium hydroxide to form Aquapentamminecobalt(III) hydroxide and sodium chloride if the initial concentration of Co(NH3)5Cl3 is 0.1 M and the reaction takes place at 25°C.

asked Feb 3 in Chemical thermodynamics

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1 answer 34 views

Calculate the standard enthalpy change for the precipitation reaction that takes place when 25.0 mL of 0.250 M barium chloride (BaCl2) and 50.0 mL of 0.100 M sodium sulfate (Na2SO4) react to form a precipitate of barium sulfate (BaSO4). The density of each solution is 1.00 g/mL and the specific heat capacity is 4.18 J/g°C. Assume a constant temperature of 25°C.

asked Feb 3 in Chemical thermodynamics

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1 answer 48 views

Calculate the standard enthalpy change for the following reaction: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) given the following standard enthalpy of formation values: ΔHf°[Fe2O3(s)] = -824.2 kJ/mol ΔHf°[CO(g)] = -110.5 kJ/mol ΔHf°[Fe(s)] = 0 kJ/mol ΔHf°[CO2(g)] = -393.5 kJ/mol

asked Feb 3 in Chemical thermodynamics

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1 answer 38 views

Calculate the standard enthalpy change for the combustion reaction of octane (C8H18) using the following balanced chemical equation:C8H18 + 12.5O2 →8CO2 + 9H2O Given the standard enthalpies of formation for CO2, H2O, and octane are -394 kJ/mol, -286 kJ/mol, and -249 kJ/mol respectively.

asked Feb 3 in Chemical thermodynamics

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1 answer 98 views

What is the metabolic pathway of a commonly prescribed drug such as aspirin in the body, and how do different factors such as age, gender, and genetics affect the metabolism of this drug?

asked Jan 31 in Medicinal Chemistry

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1 answer 72 views

Calculate the enthalpy of polymerization of ethylene from the following data: Ethylene, C2H4(g) polymerizes to form polyethylene, (C2H4)n(s) with ΔHrxn = -44.0 kJ/mol at 298 K. Additionally, it is known that the standard enthalpies of formation of C2H4(g) and polyethylene (C2H4)n(s) are 52.3 kJ/mol and -128.2 kJ/mol, respectively. Assuming the enthalpy of polymerization is independent of temperature, calculate ΔHºp for the reaction.

asked Jan 23 in ThermoChemistry

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1 answer 61 views

Calculate the enthalpy change of dissolving 5.00 g of NaOH in 100.0 g of water. The temperature of the resulting solution increases from 25.00°C to 31.50°C. The specific heat capacity of the resulting solution is 4.18 J/g°C.

asked Jan 23 in ThermoChemistry

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