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What is the quantum yield of a photochemical reaction in which 50% of the absorbed photons lead to the formation of the product? How does it differ from the quantum efficiency of the reaction and how can it be experimentally determined?
answered
3 days
ago
in
Physical Chemistry
0
votes
29
views
How does the choice of exchange-correlation functional affect the accuracy of density functional theory calculations on the catalytic reaction mechanism?
answered
Feb 18
in
Computational Chemistry
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votes
22
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What is the bond enthalpy of a carbon-hydrogen (C-H) bond in methane (CH4), given that the energy required to break a mole of C-H bonds in methane is 413 kJ/mol?
answered
Feb 18
in
Chemical bonding
0
votes
34
views
How does the absorption spectra of a molecule change with changes in its geometrical configuration? Use quantum chemical calculations to predict and explain the changes in the excited states of the molecule when its structure is altered.
answered
Feb 17
in
Computational Chemistry
0
votes
38
views
What will be the effect on the equilibrium concentration of product and reactant if we increase the temperature of the system in a reversible exothermic reaction?
answered
Feb 13
in
Chemical equilibrium
0
votes
46
views
Using Crystal Field Theory, explain the color difference between [Fe(H2O)6]2+ and [Fe(CN)6]4- complexes and their corresponding absorption spectra.
answered
Feb 12
in
Coordination Chemistry
0
votes
38
views
How can limited exposure to current research in chemistry impact a student's understanding of the subject and hinder their ability to apply it in practical settings?
answered
Feb 6
in
Chemical education
0
votes
39
views
How can chemistry teachers provide adequate support for students with learning disabilities to ensure they have equal opportunities to learn and succeed in chemistry lessons?
answered
Feb 5
in
Chemical education
0
votes
34
views
How can supramolecular chemistry be applied in the development of new drug delivery systems to improve the targeted delivery of medications and reduce their side effects? What are the main challenges in designing and synthesizing such systems, and how can self-assembly be used to overcome them? What are some examples of successful supramolecular drug delivery systems, and how have they advanced the field of medicine?
answered
Feb 5
in
Physical Chemistry
0
votes
34
views
How can industrial waste disposal practices be modified to minimize their negative impact on the environment? Provide recommendations based on chemical properties and reactions of the waste, as well as best practices for disposal methods.
answered
Feb 5
in
Environmental Chemistry
0
votes
35
views
Calculate the standard enthalpy change for the neutralization of 25.0 mL of 1.0 M hydrochloric acid (HCl) with 25.0 mL of 1.0 M sodium hydroxide (NaOH) solution at 25°C, given that the specific heat capacity of the solutions is 4.18 J/g°C, and the density of the solutions is 1.00 g/mL.
answered
Feb 3
in
Chemical thermodynamics
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votes
78
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What is the concentration of a hydrochloric acid solution if 25.00 mL of it requires 34.87 mL of a 0.120 M sodium hydroxide solution to reach a neutral pH during titration?
answered
Jan 30
in
Analytical Chemistry
0
votes
56
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Calculate the enthalpy change for the hydrolysis of sucrose given that 10.0 g of sucrose was completely hydrolyzed in excess water. The reaction takes place at 25°C and 1 atm pressure. The following reaction is involved: C12H22O11(s) + H2O(l) → 12C(s) + 11H2O(l) The enthalpy of formation of C12H22O11(s) is -2226.8 kJ/mol and the enthalpy of formation of H2O(l) is -285.8 kJ/mol.
answered
Jan 23
in
ThermoChemistry
0
votes
60
views
A student wants to know how the equilibrium position of a weak acid such as acetic acid would be affected if they add more acetate ion. If the initial concentration of acetic acid is 0.1 M and initial concentration of acetate ion is 0.05 M. What will be the new concentration of acetate ion necessary to increase the pH of the solution by 0.5 units?
answered
Jan 22
in
Chemical equilibrium
0
votes
36
views
What does the cognitive reserve theory suggest about aging and cognitive abilities?
answered
Jan 20
in
Psychology
0
votes
48
views
What is the definition of social norms?
answered
Jan 20
in
Psychology
0
votes
79
views
How does the ecological theory view individual trauma?
answered
Jan 17
in
Psychology
0
votes
44
views
Why is empirical support important for theory evaluation?
answered
Jan 17
in
Psychology
0
votes
11
views
Who developed the cognitive social learning theory?
answered
Jan 16
in
Psychology
0
votes
51
views
What is the difference between a mental ritual and a physical ritual?
answered
Jan 16
in
Psychology
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