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What is the relationship between the size of nanoparticles and their electronic and optical properties, as determined by quantum calculations?
answered
1 day
ago
in
Quantum Chemistry
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votes
25
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What is the predicted bond angle in a water molecule using the Valence Shell Electron Pair Repulsion (VSEPR) theory, and how does it compare to the actual bond angle?
answered
3 days
ago
in
Quantum Chemistry
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21
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What is the overpotential required to generate a current of 0.5 A in a galvanic cell where the standard potential is 1.4 V and the actual potential is 1.6 V? Show the calculations and explain why the overpotential is necessary for the reaction to proceed.
answered
3 days
ago
in
ElectroChemistry
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votes
15
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What is the most efficient method for synthesizing 2,4-dinitrophenol from phenol and nitric acid with a high yield?
answered
4 days
ago
in
Chemical synthesis
0
votes
30
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How does the chiral nature of a molecule affect its photochemical properties, such as its ability to undergo photoisomerization or photodegradation, and what factors influence this relationship?
answered
Feb 18
in
PhotoChemistry
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votes
26
views
What is the balanced chemical equation for the double replacement reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl)?
answered
Feb 17
in
Chemical reactions
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votes
31
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How can we optimize the extrusion process for a specific polymer to achieve desired properties in the final product?
answered
Feb 14
in
Polymer Chemistry
0
votes
31
views
What is the primary biochemical mechanism by which cortisol hormone regulates blood glucose levels in the liver, and how does it signal to the liver to activate this mechanism?
answered
Feb 12
in
BioChemistry
0
votes
38
views
How can different types of soil contaminants affect the absorption of nutrients by plants, and what are the potential consequences for agricultural productivity and food supply?
answered
Feb 6
in
Environmental Chemistry
0
votes
37
views
How can limited opportunities for hands-on experimentation in chemistry affect a student's understanding of chemical concepts and their ability to apply them in real-world situations?
answered
Feb 5
in
Chemical education
0
votes
33
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Calculate the standard enthalpy change of formation for the compound methane (CH4) given the following information:- The standard enthalpy change of formation for carbon dioxide (CO2) is -393.5 kJ/mol.- The standard enthalpy change of formation for water (H2O) is -285.8 kJ/mol.- The enthalpy of combustion for methane is -890.4 kJ/mol.
answered
Feb 3
in
Chemical thermodynamics
0
votes
90
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How does a deficiency in the enzyme lipoprotein lipase affect the metabolism and transport of different types of lipids in the body?
answered
Jan 30
in
BioChemistry
0
votes
64
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Calculate the enthalpy change of reduction for Fe2O3 using the following data:Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) ΔH°rxn = -26.8 kJ mol^-1Fe2O3(s) + 2Al(s) → Al2O3(s) + 2Fe(l) ΔH°rxn = +824.2 kJ mol^-1Note: The standard enthalpy of formation for CO2(g) is -393.5 kJ mol^-1 and for Al2O3(s) is -1675.7 kJ mol^-1.
answered
Jan 23
in
ThermoChemistry
0
votes
27
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A redox reaction is at equilibrium with a standard cell potential of +0.54 V. If the concentration of the oxidizing agent is increased by a factor of 5, what effect will this have on the position of the equilibrium and the cell potential? Assume that the reaction takes place at 25°C.
answered
Jan 22
in
Chemical equilibrium
0
votes
33
views
Who coined the term 'identity crisis'?
answered
Jan 17
in
Psychology
0
votes
8
views
What is the role of emotion in counselling?
answered
Jan 17
in
Psychology
0
votes
23
views
How can the developmental systems theory be evaluated?
answered
Jan 16
in
Psychology
0
votes
13
views
What are the three main components of emotion according to the James-Lange theory?
answered
Jan 15
in
Psychology
0
votes
32
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What are the Big Five personality traits?
answered
Jan 13
in
Psychology
0
votes
69
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What is Erik Erikson's theory of psychosocial development?
answered
Jan 13
in
Psychology
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