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1
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17
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What is the optimal ratio of diisocyanate and polyol required for the synthesis of polyurethane with desired mechanical and thermal properties?
asked
4 days
ago
in
Chemical synthesis
0
votes
1
answer
20
views
What is the most effective process for producing ammonium nitrate fertilizer from nitrogen gas and ammonia gas, and what are the optimal operating conditions for this process (i.e. temperature, pressure, catalysts, etc.)?
asked
4 days
ago
in
Chemical engineering
0
votes
1
answer
39
views
What would be the balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid, and what are the products formed in a double replacement reaction?
asked
Feb 17
in
Chemical reactions
0
votes
1
answer
23
views
What is the standard electrode potential of a copper electrode if it is combined with a zinc electrode in a galvanic cell, and the measured cell potential is 1.10 V at 298 K? Given: E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = 0.34 V.
asked
Feb 13
in
Physical Chemistry
0
votes
1
answer
38
views
What is the pH of a 0.1 M solution of HClO4 at 25°C?
asked
Feb 13
in
Inorganic Chemistry
0
votes
1
answer
44
views
How can the durability and scratch resistance of polymer-based coatings and paints be improved?
asked
Feb 7
in
Polymer Chemistry
0
votes
1
answer
39
views
How can the concentration of Persistent organic pollutants (POPs) in water bodies be effectively measured and reduced to mitigate their impact on aquatic organisms and the overall ecosystem?
asked
Feb 6
in
Environmental Chemistry
0
votes
1
answer
34
views
How can a heat exchanger be designed for a specific industrial process involving the heating and cooling of a liquid stream with a flow rate of 500L/min and a specific heat capacity of 4.2 kJ/kg K? The temperature of the hot and cold streams are 120°C and 25°C respectively, and the process requires a heat transfer rate of at least 200 kW. What should be the surface area and overall heat transfer coefficient of the heat exchanger to meet the process requirements?
asked
Feb 4
in
Chemical engineering
0
votes
1
answer
59
views
Given that the enthalpy of vaporization of water is 40.7 kJ/mol at its boiling point of 100°C, calculate the amount of energy required to boil 500g of water starting from 25°C.
asked
Feb 4
in
ThermoChemistry
0
votes
1
answer
48
views
Design a heat exchanger for a specific process that involves heating a liquid from 20°C to 60°C. The liquid has a flow rate of 500 L/hr, and it will be heated by steam at a pressure of 3 bar. The heat transfer coefficient for the steam is 3000 W/(m²·K), and the overall heat transfer coefficient for the heat exchanger is 500 W/(m²·K). Determine the surface area required for the heat exchanger and the flow rate of steam required to heat the liquid.
asked
Feb 4
in
Chemical engineering
0
votes
1
answer
38
views
Calculate the standard enthalpy change (∆H°) of combustion for methane gas (CH4) given that the heat of formation (∆Hf°) for methane is -74.87 kJ/mol and the heat of formation (∆Hf°) for carbon dioxide (CO2) is -393.51 kJ/mol, and the heat of formation (∆Hf°) for water (H2O) is -285.83 kJ/mol.
asked
Feb 3
in
Chemical thermodynamics
0
votes
1
answer
73
views
How does the deficiency in a specific amino acid affect the biosynthesis of neurotransmitters in the brain?
asked
Jan 30
in
BioChemistry
0
votes
1
answer
57
views
Here's a question:What is the molecular formula and structural formula of the fourth member of the alkane series, and how many possible isomers of this compound exist?
asked
Jan 21
in
Organic Chemistry
0
votes
1
answer
62
views
Please evaluate the attribution theory.
asked
Jan 20
in
Psychology
0
votes
1
answer
61
views
How can social learning theory be used for social change?
asked
Jan 20
in
Psychology
0
votes
1
answer
42
views
Who is associated with the concept of cognitive dissonance?
asked
Jan 20
in
Psychology
0
votes
1
answer
53
views
Who is known for their research on memory and forgetting?
asked
Jan 17
in
Psychology
0
votes
1
answer
33
views
Why did Harlow's monkey study challenge behaviourist theories?
asked
Jan 17
in
Psychology
0
votes
1
answer
11
views
Please compare correlational and experimental research designs.
asked
Jan 17
in
Psychology
0
votes
1
answer
45
views
Please compare and contrast beneficence and non-maleficence in research ethics.
asked
Jan 17
in
Psychology
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