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Design a process for the purification of 500 grams of crude aspirin containing impurities such as acetic acid and sulfuric acid. The final product must have a purity of at least 99.5%. Describe the steps involved in the purification process, including the necessary equipment, reagents, and conditions for each step. Also, calculate the percent yield of the final product based on the initial mass of crude aspirin.

asked 3 days ago in Chemical engineering by DallasMerrim (530 points)

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How can chemistry students learn and conduct experiments effectively in a limited access laboratory setting?

asked 2 days ago in Chemical education by FaustoMcNish (510 points)

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Design and synthesize a polymer-based smart material that can undergo reversible changes in response to changes in temperature or pH, and explain the mechanism behind these changes using chemical principles.

asked 3 days ago in Polymer Chemistry by VeolaClay722 (290 points)

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

asked 3 days ago in Inorganic Chemistry by PeggyStreit (650 points)

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How can chemistry be utilized to address environmental issues and promote sustainability in industries such as agriculture, energy, and manufacturing?

asked 3 days ago in Chemical education by Pat220311982 (510 points)

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Design a heat exchanger for a factory that produces 10,000 liters of sulfuric acid per day starting at 70°C and needs to be cooled to 40°C for packaging. The available cooling water supply from the local municipal is at 20°C and is available at a flow rate of 1000 liters per minute. Design the heat exchanger to achieve the required temperature drop and calculate the heat transfer coefficient and the overall heat transfer coefficient.

asked 3 days ago in Chemical engineering by Elvira88M206 (590 points)

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How can chemistry educators better incorporate current research into the curriculum in order to provide students with a more comprehensive understanding of the field?

asked 3 days ago in Chemical education by Dusty1260020 (550 points)

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Design a distillation column to separate a mixture of ethanol and water. The feed stream contains 20 mol% ethanol and the desired distillate should contain at least 95 mol% ethanol. The reflux ratio should be 3:1 and the column should have 25 theoretical trays. Determine the composition of the distillate, bottoms, and the optimal feed tray location to achieve the desired separation. Use McCabe-Thiele method to determine the number of theoretical trays required.

asked 3 days ago in Chemical engineering by TinaStamps81 (330 points)

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Determine the concentration of copper ions in a copper sulfate solution by constructing an electrochemical cell and measuring its voltage using a standard hydrogen electrode.

asked 3 days ago in Physical Chemistry by LeesaStrub9 (530 points)

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Design a polymer-based sensor for detecting the presence of ethanol in aqueous solutions, and provide a detailed explanation of the principles behind its operation.

asked 3 days ago in Polymer Chemistry by MittieStuder (470 points)

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Determine the bond angles in a water molecule using the principles of Quantum Chemistry.

asked 3 days ago in Quantum Chemistry by FaustoAllen (350 points)

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Determine the heat of hydration, in kJ/mol, for the reaction between solid Calcium chloride (CaCl2) and water (H2O), given that 1 mole of CaCl2 dissolves to produce 3 moles of ions and releases -82.8 kJ of heat in the process.

asked 3 days ago in ThermoChemistry by ErnestoSprou (470 points)

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Given the equilibrium reaction: 2NOCl(g) ⇌ 2NO(g) + Cl2(g), if the equilibrium constant (Kc) at 25°C is 2.45 x 10^-3, what will be the new value of Kc if the temperature is increased to 50°C?

asked 3 days ago in Chemical equilibrium by GQABrian353 (650 points)

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How can chemistry educators effectively incorporate safety protocols into the curriculum to ensure that students are adequately prepared to handle potentially hazardous materials and situations in the lab?

asked 2 days ago in Chemical education by RafaelaHuonD (450 points)

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1 answer 27 views

Design a system for the efficient production of hydrogen fuel using renewable energy sources. Consider factors such as cost, environmental impact, and scalability. Determine the optimal method for producing and storing hydrogen fuel, and provide a detailed design for the system. Your solution should also include calculations for the efficiency and potential output of the system.

asked 3 days ago in Chemical engineering by MittieBes365 (690 points)

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Here's a precise problem for a chemistry student to solve based on the subtopic Rearrangement reactions:What products form from the acid-catalyzed rearrangement of 2-methyl-3-butene to form 3-methyl-1-butene? Use mechanisms to explain why this rearrangement occurs.

asked 3 days ago in Organic Chemistry by GeoffreyHump (270 points)

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For a student studying surface chemistry and the adsorption of gases on solid surfaces, a precise problem could be: What is the effect of temperature on the adsorption of nitrogen gas on activated charcoal and how does it change the isotherm?

asked 3 days ago in Surface Chemistry by MavisClawson (510 points)

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Design a retrosynthesis pathway to synthesize benzyl alcohol from benzaldehyde using the appropriate reagents and reaction conditions.

asked 3 days ago in Organic Chemistry by AhmadWarby13 (410 points)

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Design a retrosynthesis for the synthesis of the following compound: 2-ethyl-3-methylcyclopent-2-enone using the Grignard reaction as the key step. Show all the necessary reagents and reaction conditions.

asked 3 days ago in Organic Chemistry by AthenaThomas (390 points)

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Determine the bond order of the molecule CO using molecular orbital theory. Show all the molecular orbital diagrams and explain why the molecule is or is not expected to be stable.

asked 3 days ago in Chemical bonding by ChristieOshe (310 points)

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