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How can we design a polymer-based sensor that can detect changes in temperature or pH levels in a given solution? What type of polymer should be used, and how can the sensor be calibrated to provide accurate readings?

asked Mar 1 in Polymer Chemistry by TheScientist (138k points)

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What is the magnetic moment of a complex formed between iron(III) ion and ethylenediamine ligand (en) with a coordination number of 6?

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What is the surface area of a given sample of activated carbon powder, if it has adsorbed 12mL of nitrogen gas at 77 K and a pressure of 1 atm, and assuming the cross-sectional area of a nitrogen molecule to be 0.16 nm²?

asked Mar 1 in Surface Chemistry by TheScientist (138k points)

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What is the pH of a solution with a concentration of 0.01 M hydrochloric acid?

asked Mar 1 in Chemical reactions by TheScientist (138k points)

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What is the yield of 2,4-dichloronitrobenzene obtained from the reaction between nitrobenzene and chlorine gas when starting with 10 grams of nitrobenzene and excess chlorine gas, given that the reaction has a theoretical yield of 95%?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the pH of a 0.1 M solution of hydrochloric acid when measured using a pH meter? Show the step-by-step calculations and include the proper use of significant figures in your answer.

asked Mar 1 in Analytical Chemistry by TheScientist (138k points)

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What is the heat required to raise the temperature of 75 g of water from 25°C to 90°C? Given that the specific heat capacity of water is 4.18 J/g°C.

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the vibrational frequency of HCl molecule in its ground state?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How can we design and implement educational programs that better incorporate chemistry into everyday life, in order to increase students' interest in the subject and promote better understanding of the impact of chemistry on the world around us?

asked Mar 1 in Chemical education by TheScientist (138k points)

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How can we control the photochemical properties of luminescent materials to enhance their performance in optoelectronics devices, such as organic light-emitting diodes (OLEDs)?

asked Mar 1 in PhotoChemistry by TheScientist (138k points)

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What is the minimum amount of heat energy required to vaporize 50 grams of water at its boiling point, given the enthalpy of vaporization of water to be 40.7 kJ/mol?

asked Mar 1 in ThermoChemistry by TheScientist (138k points)

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What is the rate of diffusion of oxygen in the air at standard temperature and pressure when the molecular weight of oxygen is 32 g/mol and the diffusion coefficient is 0.188 cm^2/s?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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How can we design a system for producing surfactants with a desired level of purity, while maximizing efficiency and minimizing waste?

asked Mar 1 in Chemical engineering by TheScientist (138k points)

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What is the theoretical yield of 2,4-dinitrobenzoic acid that can be obtained from 10 grams of benzoic acid and excess nitric acid, assuming 100% conversion efficiency?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the exchange current density (in A/cm2) for the reaction 2H+ + 2e- ⇌ H2 at a temperature of 298 K and a concentration of 0.1 M H+? Given that the standard potential of the half-cell reaction is 0 V, and the Tafel slope is 60 mV/decade.

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the rate of diffusion of carbon dioxide (CO2) gas in air at a temperature of 25°C and a pressure of 1 atm if the molar mass of CO2 is 44 g/mol?

asked Mar 1 in Physical Chemistry by TheScientist (138k points)

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What is the Gibbs free energy change at 298 K for the reaction 2Fe2+(aq) + Cl2(g) --> 2Fe3+(aq) + 2Cl-(aq) if the standard electrode potentials for the half-reactions are E°(Fe3+(aq) + e- --> Fe2+(aq)) = -0.77 V and E°(Cl2(g) + 2e- --> 2Cl-(aq)) = 1.36 V?

asked Mar 1 in ElectroChemistry by TheScientist (138k points)

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What is the yield of 4-bromoacetanilide that can be obtained through the reaction of 10 grams of acetanilide with excess bromine in the presence of a catalyst, assuming 100% conversion and a 92% purity of the final product?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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What is the magnetic moment of a tetrahedral complex with four ligands, each containing one unpaired electron, coordinated to a central transition metal ion with a d⁴ electron configuration?

asked Mar 1 in Inorganic Chemistry by TheScientist (138k points)

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What is the yield of 2,4-dinitrophenol obtained in the preparation of 2,4-dinitrophenol from phenol and nitric acid, given that 10 grams of phenol was used and a 95% yield was achieved?

asked Mar 1 in Chemical synthesis by TheScientist (138k points)

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