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23
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How does the size and shape of graphene nanoparticles affect their electronic and optical properties? And, how can we calculate these properties using quantum chemistry principles?
asked
Feb 24
in
Quantum Chemistry
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votes
1
answer
29
views
How does the presence of heavy metals in soil affect the growth and nutritional value of crops, and what methods can be used to remediate contaminated soils?
asked
Feb 22
in
Environmental Chemistry
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votes
1
answer
37
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How does the concentration of reactants affect the rate and efficiency of a chemical reaction? Provide experimental evidence to support your answer.
asked
Feb 19
in
Chemical kinetics
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votes
1
answer
52
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How does the choice of carbon source and growth technique affect the structure, properties, and applications of carbon nanotubes synthesized through chemical vapor deposition (CVD)?
asked
Feb 18
in
Materials Chemistry
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votes
1
answer
41
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How do different types of organic fertilizers, such as compost and manure, impact soil health and crop yield in sustainable agriculture practices, and what are the environmental implications of their use?
asked
Feb 14
in
Environmental Chemistry
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votes
1
answer
101
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What is the role of chlorofluorocarbons (CFCs) in the process of ozone depletion and how does their chemical structure contribute to their impact on the atmosphere?
asked
Feb 12
in
Environmental Chemistry
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votes
1
answer
61
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How can the swelling properties of polymer-based superabsorbent materials be optimized for better performance in applications such as agriculture or disposable hygiene products?
asked
Feb 11
in
Polymer Chemistry
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1
answer
40
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How can the properties of semiconductors be tailored to enhance the efficiency and performance of electronic devices, such as solar cells and transistors?
asked
Feb 10
in
Materials Chemistry
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votes
1
answer
47
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How can chemistry educators make the subject more engaging and interesting for students to increase their interest in the subject?
asked
Feb 4
in
Chemical education
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votes
1
answer
77
views
What is the dipole moment of carbon dioxide?
asked
Jan 31
in
Chemical bonding
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1
answer
85
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Calculate the standard enthalpy of formation (\Delta H_{f}^{\circ}) for Carbon dioxide (CO_2) using quantum chemical calculations.
asked
Jan 31
in
Quantum Chemistry
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votes
1
answer
95
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Calculate the enthalpy change required to ionize 2 moles of magnesium atoms to form Mg2+ ions, given that the first ionization energy of magnesium is 737 kJ/mol and the second ionization energy is 1450 kJ/mol.
asked
Jan 23
in
ThermoChemistry
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votes
1
answer
70
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Calculate the enthalpy change for the polymerization of propylene to polypropylene, given the enthalpy of formation of propylene is -103.8 kJ/mol and the enthalpy of formation of polypropylene is -45.4 kJ/mol. Assume the reaction occurs at constant pressure and temperature.
asked
Jan 23
in
ThermoChemistry
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1
answer
19
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A chemistry student is given a 25 mL sample of a solution containing an unknown amount of sodium chloride. After adding excess silver nitrate solution to the sample, the student records the mass of the resulting precipitate to be 2.655 grams. Using mass balance calculations, determine the mass percentage of sodium chloride in the original solution.
asked
Jan 22
in
Analytical Chemistry
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votes
1
answer
86
views
What is the role of a medical psychologist?
asked
Jan 20
in
Psychology
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votes
1
answer
54
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Why is Carl Rogers' person-centered therapy important?
asked
Jan 20
in
Psychology
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votes
0
answers
110
views
When was the operant-conditioning model of pain proposed?
asked
Jan 16
in
Psychology
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votes
1
answer
26
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What is the Hawethorne effect?
asked
Jan 16
in
Psychology
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votes
1
answer
97
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Compare the effectiveness of pharmacological and non-pharmacological treatments for insomnia.
asked
Jan 16
in
Psychology
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votes
1
answer
72
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What is semantic memory?
asked
Jan 14
in
Psychology
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