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How does the pH of the solution affect the rate of the photochemical reaction between a specific photosensitizer and a particular substrate, and how can we optimize the pH to obtain the maximum reaction rate?
answered
Feb 22
in
PhotoChemistry
0
votes
91
views
What is the optimal molar ratio of salicylic acid to acetic anhydride for synthesizing aspirin with a high yield?
answered
Feb 21
in
Chemical synthesis
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votes
85
views
What is the mechanism involved in the long-range transportation of POPs and their subsequent deposition in remote locations, and how does this contribute to the persistence of POPs in the environment?
answered
Feb 20
in
Environmental Chemistry
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votes
73
views
What is the crystallographic structure of NaCl and how does it affect the physical properties of the substance? How does the crystal structure of NaCl differ from that of CsCl or diamond?
answered
Feb 19
in
Physical Chemistry
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votes
154
views
How can we use infrared spectroscopy to determine the identity of a functional group in a given organic compound?
answered
Feb 13
in
Physical Chemistry
0
votes
135
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What is the mechanism of the nucleophilic addition reaction of ethanol with propanal in the presence of an acid catalyst, and how does the resulting product differ from the product formed if a base catalyst were used instead?
answered
Feb 13
in
Organic Chemistry
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votes
119
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Identify the type of intermolecular forces present in water and ammonia, and explain how these forces contribute to their physical properties.
answered
Feb 13
in
Chemical bonding
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votes
106
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How does the structure of hemoglobin influence its function as an oxygen transporter in the human body?
answered
Feb 13
in
Organic Chemistry
0
votes
88
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How can the efficiency of the production process for biofuels be optimized through the use of catalysts and other chemical additives?
answered
Feb 7
in
Chemical engineering
0
votes
128
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Given the following data for the electrochemical reaction A + B → C, where A and B are electrons:- The anodic Tafel slope is 50 mV per decade of current density.- The cathodic Tafel slope is 70 mV per decade of current density.Calculate the exchange current density (i0) for the reaction.
answered
Feb 4
in
ElectroChemistry
0
votes
138
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Calculate the standard enthalpy change for the following reaction involving liquids at 298 K: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l)Given the standard enthalpies of formation of C2H5OH(l), CO2(g) and H2O(l) are −277.6 kJ/mol, −393.5 kJ/mol and −285.8 kJ/mol respectively.
answered
Feb 3
in
Chemical thermodynamics
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votes
84
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A solution containing two different dye molecules of different sizes (methyl blue and eosin) is kept in a glass tube. Using the knowledge of diffusion and transport phenomena, calculate the time required for the eosin molecules to diffuse to a distance of 10 cm from the source of the solution, if the diffusion coefficient of eosin is known to be 2.5 x 10^-10 m^2/s.
answered
Jan 22
in
Physical Chemistry
0
votes
87
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A sample problem for a chemistry student to solve from the subtopic Calculating the effect of changing the temperature on the equilibrium constant could be: What would be the new equilibrium constant (Kc) for the reaction 2NOCl (g) ↔ 2NO (g) + Cl2 (g) at 400 K, if the initial equilibrium constant at 300 K is 2.50 x 10^-3? Given that the enthalpy change of the reaction (∆H) is -91.84 kJ/mol and the entropy change of the reaction (∆S) is -188.8 J/mol K.
answered
Jan 22
in
Chemical equilibrium
0
votes
44
views
Why is the Gardner's multiple intelligences theory significant?
answered
Jan 20
in
Psychology
0
votes
62
views
When was mindfulness-based cognitive therapy MBCT introduced?
answered
Jan 20
in
Psychology
0
votes
122
views
What is Spearman's rank correlation coefficient?
answered
Jan 20
in
Psychology
0
votes
99
views
What is attachment style according to Mary Ainsworth?
answered
Jan 17
in
Psychology
0
votes
101
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Why is a one-way ANOVA used?
answered
Jan 17
in
Psychology
0
votes
164
views
Who proposed the common sense model of illness?
answered
Jan 16
in
Psychology
0
votes
101
views
According to the information processing theory, how do we process information?
answered
Jan 16
in
Psychology
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