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Questions by TillyBbd3251
0
votes
1
answer
30
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What is the relationship between the electronegativity difference and the type of bonding (ionic, polar covalent, or nonpolar covalent) in chemical compounds? How does this relationship affect the properties of the compounds?
asked
1 day
ago
in
Chemical education
0
votes
1
answer
23
views
What is the mechanism behind the formation of the ozone hole in Antarctica and what are the possible methods to reduce its size and impact on the atmosphere?
asked
4 days
ago
in
Environmental Chemistry
0
votes
1
answer
23
views
What are the most effective surfactants and how can they be incorporated into a detergent formulation to achieve optimal cleaning performance while minimizing environmental impact in the production of detergents?
asked
4 days
ago
in
Chemical engineering
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votes
1
answer
21
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What is the effect of molecule size and shape on electron transport properties in molecular and nanoscale systems?
asked
6 days
ago
in
Quantum Chemistry
0
votes
1
answer
26
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How does the chemical structure of different polymer-based packaging materials affect their environmental impact in terms of biodegradability and sustainability?
asked
Feb 18
in
Polymer Chemistry
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votes
1
answer
26
views
What are the chemical reactions responsible for ozone depletion, and what is the impact of this depletion on the atmosphere's UV radiation levels?
asked
Feb 18
in
Environmental Chemistry
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votes
1
answer
28
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What is the bond energy of nitrogen gas in kilojoules per mole (kJ/mol) given that the N-N bond dissociation energy is 945 kJ/mol?
asked
Feb 18
in
Chemical reactions
0
votes
1
answer
42
views
What are the properties of liquid crystals that make them suitable for use in display technology? How do these properties affect the performance of liquid crystal displays?
asked
Feb 13
in
Materials Chemistry
0
votes
1
answer
30
views
How can the application properties of a polymer-based coating be improved while maintaining its durability and chemical resistance?
asked
Feb 6
in
Polymer Chemistry
0
votes
1
answer
48
views
Design a chemical reactor with a capacity of 100 liters and determine the operating conditions (temperature, pressure, and flow rate) required to achieve a 95% yield of product X in a specific reaction. The reaction rate constant is known to be 0.1/min and the initial concentration of reactant A is 2 mol/L. Use the design equation for a first-order irreversible reaction and assume a constant density of the reaction mixture.
asked
Feb 3
in
Chemical engineering
0
votes
1
answer
60
views
Calculate the standard enthalpy change for the reaction between methane and oxygen to form carbon dioxide and water vapor at 298 K and 1 atm of pressure, given the following reaction equation:CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)The standard enthalpies of formation for CH4(g), CO2(g), and H2O(g) are -74.8 kJ/mol, -393.5 kJ/mol, and -241.8 kJ/mol, respectively.
asked
Feb 3
in
Chemical thermodynamics
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votes
1
answer
97
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Design a heat exchanger to cool down a mixture of water and ethylene glycol from 80°C to 20°C using cooling water from a nearby lake that enters at 15°C. The mixture flow rate is 10 L/min, and the desired outlet temperature is 20°C. The heat transfer coefficient for the heat exchanger is 250 W/(m².K) and the overall heat transfer coefficient is to be assumed as 350 W/(m².K). The heat capacity of the mixture is 3.8 kJ/(kg.K) and the density is 1030 kg/m³. Determine: a) the surface area of the heat exchanger required for this process,b) the volume flow rate of cooling water required, and c) the overall heat transfer rate in kW.
asked
Jan 30
in
Chemical engineering
0
votes
1
answer
83
views
What steps can be taken to maximize the chances of getting a chemistry-related internship or job opportunity given the limited availability in the industry?
asked
Jan 30
in
Chemical education
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votes
1
answer
40
views
According to the cocktail party effect, how do people selectively attend to certain stimuli in a noisy environment?
asked
Jan 20
in
Psychology
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votes
1
answer
45
views
When did partial least squares regression become more widely used?
asked
Jan 20
in
Psychology
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votes
1
answer
72
views
What is neglect syndrome, and what brain area is thought to be responsible?
asked
Jan 20
in
Psychology
0
votes
1
answer
12
views
According to the heuristics and biases approach, what are the limitations of human decision-making?
asked
Jan 17
in
Psychology
0
votes
1
answer
35
views
According to the social cognitive theory, how do people learn from social influences?
asked
Jan 17
in
Psychology
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votes
1
answer
10
views
Who developed the positivist approach to psychology?
asked
Jan 16
in
Psychology
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votes
1
answer
38
views
What is the principle of continuity?
asked
Jan 15
in
Psychology
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