Recent activity by KerrieTillma

1 answer 1 view

How can the sensitivity of SERS be improved for the detection of low concentration trace molecules?

asked 17 hours ago in Surface Chemistry

1 answer 39 views

Design a distillation column to separate a mixture of acetone and water containing 35% (by mole) acetone with a feed rate of 1000 kg/hr. The desired purity of the overhead product is 99% acetone, and the bottom product should contain no more than 0.5% acetone. The available reflux ratio is 2.5, and the feed is at its boiling point at normal atmospheric pressure. Determine the number of theoretical trays required, the optimum feed tray location, and the reflux and boilup rates needed for the design.

asked Feb 4 in Chemical engineering

1 answer 31 views

Calculate the standard enthalpy change (∆H°) for the dissolution reaction of 5.00 grams of sodium chloride (NaCl) in 100.0 mL of water, given that the final temperature of the solution was 25.0°C and the heat capacity of the solution was 4.18 J/g°C. The molar mass of NaCl is 58.44 g/mol and the density of water is 1.00 g/mL.

asked Feb 3 in Chemical thermodynamics

1 answer 85 views

What is the composition of an unknown mixture contained in a gas sample obtained from an industrial plant? Use gas chromatography to separate and analyze the mixture, and determine the percentage of each component present in the sample.

answered Jan 30 in Analytical Chemistry

1 answer 53 views

A chemistry student wants to design an electrochemical cell that produces a voltage of at least 1.5 volts. The available electrodes are copper and aluminum. Using Faraday's law, calculate the mass of copper needed to produce the required voltage if aluminum is used as the other electrode. The specific gravity of copper is 8.96 g/cm³, and the standard reduction potential of copper and aluminum are -0.34 V and -1.66 V, respectively.

asked Jan 22 in Physical Chemistry

1 answer 31 views

What is the therapeutic use of interpretation in psychodynamic therapy?

asked Jan 20 in Psychology

1 answer 9 views

Who developed the concept of the signature strengths?

asked Jan 20 in Psychology

1 answer 35 views

According to the hindsight bias, what do individuals do when they generate an explanation for an event?

asked Jan 17 in Psychology

1 answer 9 views

Please compare the role of culture in Erikson's theory versus that of Lev Vygotsky's theory.

asked Jan 17 in Psychology

1 answer 30 views

Where should we look when evaluating the scientific validity of theories in organisational psychology?

answered Jan 16 in Psychology

1 answer 66 views

What is the concept of 'thought-action fusion' in OCD?

asked Jan 13 in Psychology

1 answer 9 views

What type of climate is found mostly near the equator?

asked Jan 8 in Science

1 answer 12 views

Name the physical phenomenon of the ocean that has a significant impact on both ocean life and human life.

answered Dec 27, 2024 in Science

1 answer 60 views

Banging on a drum is an example of which type of energy?

answered Dec 27, 2024 in Science

1 answer 36 views

What kind of a relationship do plants and soil have?

asked Dec 27, 2024 in Science

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