Recent questions without an upvoted answer

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Explain how the glass transition temperature of a polymer is influenced by its molecular weight and degree of branching.

asked 2 days ago in Physical Chemistry by DenishaVilla (230 points)

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1 answer 43 views

Does the rate of a photochemical reaction increase linearly with the increase in light intensity, or is there a maximum intensity beyond which no further increase in the rate is observed? Provide experimental evidence to support your answer.

asked 2 days ago in PhotoChemistry by MarciaMathia (410 points)

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1 answer 49 views

Does the concentration of reactants in a chemical reaction affect the reaction yield, and if so, what is the relationship between the two variables?

asked 2 days ago in Chemical kinetics by FlorianRico (610 points)

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1 answer 39 views

Does surface modification of a polymer affect its stability and adhesion properties when used in biomedical applications?

asked 2 days ago in Surface Chemistry by GMBCarmon086 (530 points)

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1 answer 40 views

Does changing the concentration of reactants affect the reaction rate and ultimately, the profitability of the reaction in the synthesis of a particular chemical compound? If so, what is the optimal concentration of reactants that maximizes both the reaction rate and profitability?

asked 2 days ago in Chemical kinetics by Christie65L5 (690 points)

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1 answer 44 views

Dinitrogen tetroxide converts into nitrogen dioxide according to the following equation N2O4(g) ⇋ 2NO2(g). At equilibrium, the concentration of N2O4 is found to be 0.02 M and the concentration of NO2 is found to be 0.08 M. Calculate the equilibrium constant (Kc) for this reaction.

asked 2 days ago in Chemical equilibrium by SoilaThibode (290 points)

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1 answer 32 views

Develop a process for the synthesis and purification of aspirin from salicylic acid, highlighting the key reaction steps and techniques used to obtain a high purity product.

asked 2 days ago in Chemical engineering by DarbyManske (570 points)

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1 answer 38 views

Develop a process for the purification of caffeine from tea leaves using solvent extraction technique. Provide a detailed explanation of the steps involved in the process and the criteria that will determine the efficiency of the procedure.

asked 2 days ago in Chemical engineering by WernerDillar (430 points)

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1 answer 22 views

Develop a polymer-based composite that can withstand extreme heat and high stress conditions, making it suitable for use in turbine engine components in aerospace applications.

asked 2 days ago in Polymer Chemistry by Edmund36D97 (450 points)

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1 answer 37 views

Develop a design for a system that effectively treats the wastewater produced by a textile factory, addressing the removal of coloring agents, heavy metals, and other hazardous contaminants.

asked 2 days ago in Chemical engineering by LeannaVance (470 points)

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1 answer 34 views

Determine the zeta potential of silver nanoparticles using the electrophoretic mobility measured at different pH values ranging from 3 to 9.

asked 2 days ago in Surface Chemistry by ArronY739552 (170 points)

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1 answer 36 views

Determine the VSEPR geometry of the methane molecule (CH4) and draw its Lewis structure.

asked 2 days ago in Chemical bonding by KarlaHertz3 (690 points)

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1 answer 41 views

Determine the VSEPR geometry of PCl5 molecule and predict the bond angles.

asked 2 days ago in Chemical bonding by DaleHayden7 (370 points)

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1 answer 32 views

Determine the vibrational frequencies and corresponding infrared spectra for a water molecule (H2O) using quantum chemistry calculations. Explain the observed peaks in the IR spectra in terms of the vibrational modes of the molecule.

asked 2 days ago in Quantum Chemistry by SheenaIverso (590 points)

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Determine the type of isomerism of the molecule CH3CH2CH2OH and draw its corresponding isomer(s).

asked 2 days ago in Chemical bonding by EarlKeisler (390 points)

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1 answer 37 views

Determine the type of inorganic solid formed between Strontium (Sr) and Oxygen (O) based on their electronegativities and bonding behavior. Is it ionic, covalent or metallic?

asked 2 days ago in Inorganic Chemistry by MiaWelker055 (650 points)

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1 answer 26 views

Determine the type of inorganic solid formed between Mg and O, and explain how you arrived at your conclusion.

asked 2 days ago in Inorganic Chemistry by PeggyStreit (650 points)

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1 answer 34 views

Determine the type of inorganic compound formed when Magnesium (Mg) reacts with Oxygen (O2). Is it an ionic, covalent, or metallic compound? Explain your answer.

asked 2 days ago in Inorganic Chemistry by FelipaToombs (730 points)

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1 answer 24 views

Determine the Tafel slopes for the oxidation of H2 gas and the reduction of O2 gas using a platinum electrode in a 1 M acidic solution. The measured current densities at the anode and cathode were 0.5 mA/cm² and 0.3 mA/cm², respectively.

asked 2 days ago in ElectroChemistry by GeraldoBohm (330 points)

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1 answer 40 views

Determine the standard enthalpy of formation of nitrogen dioxide (NO2) given that the balanced equation for the combustion of one mole of NO2 is:4NO2(g) + 6H2O(l) → 4HNO3(aq) + 2NO(g)The standard enthalpies of formation for HNO3(l), H2O(l), and NO(g) are -174.1 kJ/mol, -285.8 kJ/mol, and 90.4 kJ/mol, respectively.

asked 2 days ago in Chemical thermodynamics by AbdulCorser8 (610 points)

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