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1
answer
20
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What are the main factors that affect the degradation and stability of polymeric materials and how can we control or minimize their impact in different environments?
asked
5 days
ago
in
Polymer Chemistry
0
votes
1
answer
16
views
What is the effect of increasing temperature on the rate of photochemical reactions in the presence of a particular catalyst, and how does this compare to the rate of non-temperature-dependent reactions under the same conditions?
asked
6 days
ago
in
PhotoChemistry
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votes
1
answer
31
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How does the concentration of heavy metals in soil affect the growth and development of plants, and what are the potential health risks associated with consuming these contaminated plants?
asked
6 days
ago
in
Environmental Chemistry
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votes
1
answer
29
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How does the concentration of acidity in acid mine drainage affect the solubility of heavy metals and other toxic substances, and subsequently impact the water quality in nearby aquatic ecosystems?
asked
6 days
ago
in
Environmental Chemistry
0
votes
1
answer
30
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How does the chemical structure of a drug affect its pharmacodynamics in the human body?
asked
Feb 18
in
Medicinal Chemistry
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votes
1
answer
27
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What is the difference in the boiling points of a primary, secondary, and tertiary alcohol with the same molecular weight? Provide an explanation based on intermolecular forces.
asked
Feb 17
in
Organic Chemistry
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votes
1
answer
36
views
What is the role of metal ions in the catalytic activity of metalloenzymes and metalloproteins? Provide specific examples and discuss the coordination geometry and ligand environment of the metal ions in these enzymes/proteins.
asked
Feb 13
in
Coordination Chemistry
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votes
1
answer
33
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What is the coordination number of the central metal ion in hemoglobin, a metalloprotein responsible for oxygen transport in the blood, and how does its coordination affect its biological function?
asked
Feb 13
in
Coordination Chemistry
0
votes
1
answer
42
views
What is the effect of combining ibuprofen and aspirin on the blood-thinning properties of aspirin?
asked
Feb 12
in
Medicinal Chemistry
0
votes
1
answer
30
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How can the incorporation of more environmental chemistry concepts into the chemistry curriculum improve our understanding of the effects of chemical pollutants on the environment and human health? Provide examples of specific environmental chemistry topics that should be emphasized more in the curriculum.
asked
Feb 7
in
Chemical education
0
votes
1
answer
38
views
How can the chemical structures and properties of natural compounds be modified and optimized to develop new treatments for inflammatory diseases such as rheumatoid arthritis?
asked
Feb 6
in
Medicinal Chemistry
0
votes
1
answer
31
views
How can chemistry departments secure sufficient funding to improve their teaching infrastructure and provide better educational opportunities for students?
asked
Feb 4
in
Chemical education
0
votes
1
answer
54
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How does changing the reaction conditions, such as temperature and pressure, affect the properties of the final product in the production of polymers?
asked
Feb 3
in
Chemical engineering
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votes
1
answer
79
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What is the standard enthalpy change (∆H°) for the reaction: 2H2O(l) + 2O2(g) → 4H2O(l) at 25°C? Calculate the value using quantum chemical methods and compare it to the experimental value.
asked
Jan 31
in
Quantum Chemistry
0
votes
1
answer
61
views
Calculate the enthalpy change for the adsorption of nitrogen gas on the surface of activated charcoal, given that the adsorption pressure is 1 atm at a temperature of 298 K. The quantity of nitrogen gas adsorbed is 0.01 moles per gram of charcoal, and the heat of combustion of the same amount of charcoal is -35.4 kJ/mol.
asked
Jan 23
in
ThermoChemistry
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votes
1
answer
9
views
Assuming complete combustion, what is the amount of heat energy released when 25 grams of methane (CH4) is burned completely in oxygen gas (O2)? The enthalpy of combustion for methane is -890.4 kJ/mol.
asked
Jan 22
in
ThermoChemistry
0
votes
1
answer
64
views
A student is asked to design a distillation column for the separation of a mixture consisting of ethanol and water. The student has to determine the number of theoretical plates required for the column to achieve a product concentration of 95% ethanol, given the feed mixture contains 25% ethanol and 75% water. The student also needs to calculate the amount of steam required for the reboiler to operate at a reflux ratio of 3.5, assuming the total condenser efficiency is 100%.
asked
Jan 22
in
Chemical engineering
0
votes
1
answer
33
views
A chemical engineer needs to separate a mixture of ethanol and water using a distillation column. The feed to the column has 30 mol% ethanol and 70 mol% water, and the desired distillate composition is 95 mol% ethanol. The feed rate is 100 kmol/hour and the reflux ratio is 2. Calculate the number of theoretical trays required in the column to achieve the desired distillate composition.
asked
Jan 22
in
Chemical engineering
0
votes
1
answer
75
views
A 50 mL solution of 0.1 M Cu(NO3)2 was electrolyzed for 20 minutes. During this time, a current of 0.5 A was passed through the solution. What is the final concentration of Cu2+ ions in the solution after the electrolysis?
asked
Jan 22
in
ElectroChemistry
0
votes
1
answer
38
views
Who coined the term 'scapegoat'?
asked
Jan 20
in
Psychology
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