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What is the optimum reaction time and temperature for the synthesis of polyethylene terephthalate from terephthalic acid and ethylene glycol, and how do these parameters affect the yield and molecular weight of the resulting polymer?
asked
5 days
ago
in
Chemical synthesis
0
votes
1
answer
21
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How does the molecular structure of a compound affect its electric dipole moment, and how can it be predicted using ab initio calculations?
asked
6 days
ago
in
Computational Chemistry
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votes
1
answer
37
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How does the change in pH affect the rate of photochemical reactions in the presence of a photo-sensitizer thus causing a photo-induced electron transfer to occur?
asked
Feb 18
in
PhotoChemistry
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votes
1
answer
36
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How can we increase diversity in the chemistry field and address the challenges faced by underrepresented groups?
asked
Feb 13
in
Chemical education
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votes
1
answer
39
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How to design a system for the production of surfactants with maximum efficiency, using the minimum amount of raw materials and energy input, while ensuring safety measures and compliance with environmental regulations?
asked
Feb 12
in
Chemical engineering
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votes
1
answer
37
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How does the coordination chemistry of metalloproteins and enzymes contribute to their biological function? Provide examples of specific metalloproteins and enzymes and explain the roles of the metal ions in their catalytic activity.
asked
Feb 12
in
Coordination Chemistry
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1
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39
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What are the coordination chemistry principles involved in chelation therapy, and how do they contribute to the effectiveness of the treatment for heavy metal poisoning?
asked
Feb 12
in
Coordination Chemistry
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1
answer
37
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How can the synthesis and characterization of new materials be optimized for increased efficiency and cost-effectiveness in the removal of heavy metals from water?
asked
Feb 11
in
Materials Chemistry
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1
answer
47
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How can the electronic and magnetic properties of molecular magnets be accurately predicted using quantum mechanical calculations?
asked
Feb 7
in
Quantum Chemistry
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1
answer
98
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Identify the structure of an unknown organic compound using nuclear magnetic resonance spectroscopy, given the following NMR spectrum and molecular formula (C7H14O2): Chemical shift (ppm) Integration0.87 — 3H (s)1.25 — 3H (s)1.45 — 2H (m)2.10 — 2H (t)2.80 — 1H (br s)4.00 — 1H (t)4.20 — 1H (br s)9.70 — 1H (s)
asked
Jan 30
in
Analytical Chemistry
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votes
1
answer
61
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Calculate the enthalpy of desorption for the process of magnesium oxide (MgO) surface drying at a temperature of 500 K, given that the equilibrium pressure of water vapor above the dried MgO is 0.056 atm and the enthalpy of adsorption of water on MgO is -44.48 kJ/mol.
asked
Jan 23
in
ThermoChemistry
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1
answer
81
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A 25 mL solution of 0.1 M AgNO3 is mixed with a 50 mL solution of 0.05 M NaCl. What is the mass of AgCl that will be produced if a reaction occurs? (Assume the reaction goes to completion.)
asked
Jan 22
in
Chemical reactions
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votes
1
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35
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Who was the psychologist that proposed the opponent-process theory of colour vision?
asked
Jan 20
in
Psychology
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1
answer
41
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When was the humanistic theory proposed?
asked
Jan 16
in
Psychology
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votes
1
answer
37
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According to the cognitive psychology approach, what is working memory and how does it differ from long-term memory?
asked
Jan 16
in
Psychology
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1
answer
84
views
What is the difference between a lesion study and a neuroimaging study?
asked
Jan 16
in
Psychology
0
votes
1
answer
39
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Who proposed the Observational Learning Theory?
asked
Jan 15
in
Psychology
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1
answer
30
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What is the main goal of historical analysis?
asked
Jan 15
in
Psychology
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1
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37
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What is solution-focused brief therapy?
asked
Jan 14
in
Psychology
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1
answer
38
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What is the difference between the psychoanalytic and behaviourist approaches to psychology?
asked
Jan 14
in
Psychology
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