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0
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1
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30
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How does the particle size of a gold nanoparticle affect its surface area and reactivity in catalysis reactions?
asked
Feb 22
in
Physical Chemistry
0
votes
1
answer
32
views
What is the effect of temperature on the adsorption of gas molecules on a solid surface? Is the adsorption process exothermic or endothermic? Support your answer with experimental data and a suitable equation.
asked
Feb 19
in
Physical Chemistry
0
votes
1
answer
133
views
What is the polarity of the bond between carbon and oxygen in the molecule carbon dioxide (CO2)?
asked
Feb 13
in
Chemical bonding
0
votes
1
answer
61
views
How does the activation of G protein-coupled receptors (GPCRs) initiate signal transduction pathways in biochemistry, and what is the specific biochemical mechanism involved in this process?
asked
Feb 13
in
BioChemistry
0
votes
1
answer
37
views
How can the levels of volatile organic compounds (VOCs) in indoor air be measured and controlled to improve indoor air quality and prevent adverse health effects?
asked
Feb 7
in
Environmental Chemistry
0
votes
1
answer
43
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Design a heat exchanger for a chemical process that requires the transfer of heat from a hot stream containing molten sodium at 1100°C to a cold stream containing water at 25°C. The hot stream inlet flow rate is 1000 kg/hr, and the cold stream outlet temperature should be limited to a maximum of 70°C. The heat transfer coefficient for the tubeside and shellside is 1000 W/m²K and 500 W/m²K, respectively. The design should minimize the size and cost of the heat exchanger while meeting the thermal requirements of the process.
asked
Feb 4
in
Chemical engineering
0
votes
1
answer
58
views
Calculate the standard enthalpy change for the reaction of the combustion of liquid ethylene glycol $(C_2H_6O_2)$ when 500g of the compound is burned completely with excess oxygen gas, given the enthalpies of formation of $CO_2$ (-393.5 kJ/mol), $H_2O$ (-285.8 kJ/mol), and $C_2H_6O_2$ (-694.3 kJ/mol).
asked
Feb 3
in
Chemical thermodynamics
0
votes
1
answer
84
views
What is the relationship between air pollution levels and the incidence of respiratory diseases in urban areas?
asked
Jan 31
in
Environmental Chemistry
0
votes
1
answer
84
views
What is the amount of copper ions present in a 0.01 M CuSO4 solution that is electrolyzed for 10 minutes using a current of 0.3 A?
asked
Jan 30
in
Analytical Chemistry
0
votes
1
answer
65
views
Calculate the enthalpy change for the hydrolysis of 2 moles of sucrose (C12H22O11) into glucose (C6H12O6) and fructose (C6H12O6) given the following information:- Enthalpy of formation of glucose = -1273 kJ/mol- Enthalpy of formation of fructose = -1260 kJ/mol- Enthalpy of formation of sucrose = -2226 kJ/mol
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
35
views
Analyzing the levels of pesticide residues in commonly consumed fruits and vegetables and their potential health effects on humans: A case study in a specific region.
asked
Jan 22
in
Environmental Chemistry
0
votes
1
answer
113
views
What is the specific configuration (R or S) of the chiral center in the molecule shown below? Hint: Use the Cahn-Ingold-Prelog priority rules to assign priorities to the substituents attached to the chiral center and determine the direction of rotation needed to align the priorities from highest to lowest.
asked
Jan 21
in
Organic Chemistry
0
votes
1
answer
65
views
How could the nature-nurture debate relate to childhood development?
asked
Jan 20
in
Psychology
0
votes
1
answer
133
views
What is the drive reduction theory?
asked
Jan 20
in
Psychology
0
votes
1
answer
34
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When was the concept of the placebo first introduced in medical research?
asked
Jan 20
in
Psychology
0
votes
1
answer
54
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When was the interpersonal theory of personality disorders developed?
asked
Jan 16
in
Psychology
0
votes
1
answer
54
views
Why is it important to critically evaluate sources of information before accepting them?
asked
Jan 15
in
Psychology
+2
votes
1
answer
60
views
Yeasts are single-celled fungi. about 1,000 species are recognized, but the most common species is saccharomyces cerevisiae, which is used in this?
asked
Jan 8
in
Science
0
votes
1
answer
54
views
When electrons move from one atom to another, they become what?
asked
Jan 8
in
Science
0
votes
1
answer
110
views
What structure is found at the top of the head of the sperm that helps it penetrate and fertilize the egg?
asked
Jan 7
in
Science
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