Recent activity by Shirley80008

1 answer 21 views

How can a chemist develop a process for the efficient production of 1,4-dioxane, a key intermediate in the production of polymers and solvents, using the principles of chemical engineering? Consider factors such as reaction conditions, catalyst selection, and process optimization to maximize yield and minimize waste.

asked 1 day ago in Chemical engineering

1 answer 39 views

Design a heat exchanger for a chemical process that involves cooling 1000 kg of a liquid from 80°C to 40°C using water as the cooling fluid. The process flow rate is 5 kg/min and the maximum allowable pressure drop in the heat exchanger is 5 kPa. Assume a heat transfer coefficient of 1000 W/m²K for the liquid and 5000 W/m²K for the water. Design the heat exchanger to occupy a maximum area of 20 m². What is the surface area of the heat exchanger required and what would be the optimal flow configuration?

answered 1 day ago in Chemical engineering

1 answer 30 views

Calculate the standard enthalpy change for the sublimation of iodine solid to iodine gas at 298 K with the following given data: - Standard enthalpy of fusion of iodine: 15.52 kJ/mol- Standard molar entropy of iodine solid: 62.7 J/K/mol- Standard molar entropy of iodine gas: 260.6 J/K/mol

asked 2 days ago in Chemical thermodynamics

1 answer 49 views

Calculate the enthalpy change for the ionization of sodium chloride given that the enthalpy of formation of NaCl is -411 kJ/mol, and the ionization energy of Na and Cl are 496 kJ/mol and 349 kJ/mol respectively.

asked Jan 23 in ThermoChemistry

1 answer 4 views

A chemistry student wants to determine the percentage of ethanol in a sample of wine. The student takes a 50 mL aliquot of the wine, dries it, and finds the weight of the residual solids to be 0.325 g. The student then distills the rest of the wine, evaporates the distillate to dryness, and finds the weight of the residue to be 2.324 g. Using mass balance calculations, what is the percentage of ethanol in the wine sample?

answered Jan 22 in Analytical Chemistry

1 answer 23 views

According to Maslow's hierarchy of needs theory, what is the second highest level of need?

answered Jan 20 in Psychology

1 answer 7 views

When evaluating cognitive behavioural therapy CBT theories, what are some of the factors to consider?

asked Jan 20 in Psychology

1 answer 16 views

What is the difference between cognition and behaviour?

asked Jan 14 in Psychology

1 answer 7 views

What is a random assignment?

answered Jan 14 in Psychology

1 answer 16 views

What is the difference between sensory and working memory?

answered Jan 13 in Psychology

1 answer 16 views

Where does the process of assembling amino acids into a protein take place?

asked Jan 8 in Science

1 answer 30 views

Which of the animals digest cellulose with the aid of methanogens?

answered Jan 8 in Science

1 answer 13 views

What type of alloys are used in musical instruments?

answered Jan 8 in Science

1 answer 18 views

What is the biggest group of animals on the planet?

asked Jan 6 in Science

1 answer 23 views

What are the outer-shell electrons of an atom called?

answered Jan 6 in Science

1 answer 67 views

Microfilaments are mostly concentrated just beneath what?

answered Dec 31, 2024 in Science

1 answer 8 views

Desert plants have special stems and leaves to conserve what?

asked Dec 30, 2024 in Science

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