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How does the degree of conjugation in a π-system affect the energy of the HOMO and LUMO orbitals of a molecule, and how can this information be obtained from quantum chemical calculations of excited states?
asked
6 days
ago
in
Computational Chemistry
0
votes
1
answer
21
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What is the effect of temperature and pressure on the adsorption of gases on solid surfaces?
asked
Feb 17
in
Surface Chemistry
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votes
1
answer
11
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How to design a process for the production of pure nitrogen gas on an industrial scale using pressure swing adsorption (PSA) technology?
asked
Feb 12
in
Chemical engineering
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votes
1
answer
2
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How can we design a new drug molecule for treating eczema that can penetrate the skin barrier and target the underlying inflammatory response in the skin cells?
asked
Feb 12
in
Medicinal Chemistry
0
votes
1
answer
19
views
How can the efficiency of the detergent production process be improved while maintaining its quality and reducing environmental impact?
asked
Feb 7
in
Chemical engineering
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votes
1
answer
57
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Calculate the standard enthalpy change for the phase transition reaction of solid ammonium nitrate (NH4NO3) to gaseous NH3 and NO2, given that the standard enthalpy of formation for solid NH4NO3 is -365.5 kJ/mol, the standard enthalpy of formation for NH3(g) is -46.1 kJ/mol, and the standard enthalpy of formation for NO2(g) is 33.2 kJ/mol.
asked
Feb 3
in
Chemical thermodynamics
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votes
1
answer
64
views
How do changes in the electronic structure of reactants affect the rate and mechanism of electron transfer processes during redox reactions?
asked
Jan 31
in
Quantum Chemistry
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votes
1
answer
83
views
How does the pH value of water bodies affected by acid rain change over time, and how does this impact the aquatic life inhabiting those water bodies?
asked
Jan 30
in
Environmental Chemistry
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votes
1
answer
56
views
Calculate the heat required to sublime 10 grams of dry ice (carbon dioxide) at its melting point (-78.5°C) and convert it to a gas at its boiling point (-57°C). The heat of sublimation of carbon dioxide is 25.2 kJ/mol.
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
60
views
Calculate the enthalpy of solution of sodium chloride (NaCl) when 10 grams of NaCl is dissolved in 100 mL of water assuming that the specific heat capacity of the solution is equal to the specific heat capacity of water (4.18 J/g°C) and the temperature change is negligible.
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
62
views
Calculate the amount of energy in Joules required to melt 15 grams of ice at 0°C, given that the heat of fusion of water is 334 J/g.
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
10
views
A researcher is working on the desorption of a specific gas from a metal surface. The enthalpy of desorption for this process is -23.4 kJ/mol. If the researcher desorbs 0.75 moles of the gas, how much heat is released (or absorbed)?
asked
Jan 22
in
ThermoChemistry
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votes
0
answers
39
views
A chemical plant has a mixture of ethanol and water with a known composition. The plant wants to separate the mixture using a distillation column. As a chemistry student, design a feasible distillation column that can effectively separate the mixture with the given composition. You need to specify the height, diameter, number of trays, reflux ratio, and other necessary parameters needed for designing the column. You are also required to provide an explanation for the choice of each parameter.
asked
Jan 22
in
Psychology
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votes
1
answer
32
views
How does Self-Efficacy Theory help understand coping with end-of-life experiences?
asked
Jan 20
in
Psychology
0
votes
1
answer
72
views
How might psychology theories and frameworks inform culturally sensitive end-of-life care?
asked
Jan 20
in
Psychology
0
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1
answer
56
views
Who developed the problem-solving therapy and what were its main assumptions?
asked
Jan 17
in
Psychology
0
votes
1
answer
36
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What is the 'good-enough parenting' concept?
asked
Jan 17
in
Psychology
0
votes
1
answer
52
views
Where might a cognitive-behavioural psychologist look for the cause of eating disorders?
asked
Jan 17
in
Psychology
0
votes
1
answer
37
views
When was the attachment theory first introduced?
asked
Jan 16
in
Psychology
0
votes
1
answer
55
views
What does the theory of attention suggest?
asked
Jan 15
in
Psychology
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