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1
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How does the size and shape of gold nanoparticles affect their photochemical properties?
asked
Feb 24
in
PhotoChemistry
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votes
1
answer
27
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How does the mechanism of photochemical reactions differ in aromatic compounds compared to aliphatic compounds?
asked
Feb 20
in
PhotoChemistry
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votes
1
answer
31
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How does the addition of a specific type of polymer to a medical implant affect its mechanical properties and overall performance in the body?
asked
Feb 17
in
Materials Chemistry
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votes
1
answer
84
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How can the use of infrared (IR) spectroscopy be employed to determine the types of bonds present in a molecule? Provide an example of a molecule and its IR spectrum that illustrate this technique.
asked
Feb 13
in
Physical Chemistry
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votes
1
answer
63
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How do increased levels of nutrients, such as nitrogen and phosphorus, contribute to eutrophication and what specific chemical reactions occur in the water that can negatively impact aquatic ecosystems?
asked
Feb 13
in
Environmental Chemistry
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1
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55
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What is the effect of heavy metal toxicity on aquatic organisms, and how does this impact the food chain and the overall health of the ecosystem? Additionally, how can we prevent or mitigate the release of heavy metals into aquatic environments?
asked
Feb 13
in
Environmental Chemistry
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1
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33
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How can the medicinal chemistry approach be applied to develop new treatments for viral infections that are resistant to currently available antiviral drugs?
asked
Feb 10
in
Medicinal Chemistry
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1
answer
35
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How can chemistry teachers integrate technology into their teaching methods to effectively convey complex chemical concepts and principles to their students?
asked
Feb 6
in
Chemical education
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1
answer
71
views
Calculate the standard entropy change of the following reaction: 2Fe(s) + 3Cl2(g) → 2FeCl3(s) Given that the standard enthalpy change for this reaction is -400 kJ/mol at 298 K and the standard molar entropy of FeCl3(s) is 95 J/mol K.
asked
Feb 3
in
Inorganic Chemistry
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1
answer
54
views
Calculate the standard enthalpy change for the vaporization of 15 grams of water at its boiling point, given that the molar enthalpy of vaporization of water is 40.7 kJ/mol.
asked
Feb 3
in
Chemical thermodynamics
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1
answer
106
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What is the concentration of iron(II) sulfate in a 20 mL sample solution that has an absorbance of 0.45 at 562 nm, given that the molar extinction coefficient of iron(II) sulfate at that wavelength is 7,590 M^-1cm^-1?
asked
Jan 30
in
Analytical Chemistry
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1
answer
67
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Calculate the enthalpy of ionization of magnesium if 4.8 g of magnesium reacts completely with hydrochloric acid to form 224 mL of hydrogen gas at standard temperature and pressure (STP). The heat released during the reaction is -412 kJ/mol.
asked
Jan 23
in
ThermoChemistry
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1
answer
74
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A student needs to calculate the current density (in A/m^2) in an electrochemical cell with a cross-sectional area of 0.01 m^2 and a current of 0.5 A passing through it. The half-cell reactions are as follows:Anode: Zn(s) -> Zn2+(aq) + 2e^-Cathode: Cu2+(aq) + 2e^- -> Cu(s)The concentrations of Zn2+ and Cu2+ ions in the solutions are 0.1 M and 0.01 M, respectively. The temperature of the cell is 298 K. Calculate the current density.
asked
Jan 22
in
ElectroChemistry
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1
answer
78
views
What did the genetics study on anorexia nervosa find?
asked
Jan 20
in
Psychology
0
votes
1
answer
46
views
Why is the humanistic approach significant in understanding self-concept?
asked
Jan 20
in
Psychology
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1
answer
69
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What is the connection between piaget's theory and teaching young children?
asked
Jan 20
in
Psychology
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1
answer
52
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What are the similarities and differences between personality disorders and mood disorders?
asked
Jan 17
in
Psychology
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votes
1
answer
78
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What is explanatory power?
asked
Jan 15
in
Psychology
0
votes
1
answer
56
views
According to Maslow, how does the hierarchy of needs influence behaviour?
asked
Jan 15
in
Psychology
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votes
1
answer
73
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How can observation be used in treatment?
asked
Jan 15
in
Psychology
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