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How does the production and consumption of a particular product (e.g. gasoline or plastic) contribute to its carbon footprint and what steps can be taken to reduce this impact on the environment?
answered
3 days
ago
in
Environmental Chemistry
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votes
23
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What is the most effective method to clean up and remediate a large-scale oil spill in a marine environment using environmentally-friendly and sustainable chemistry techniques?
answered
4 days
ago
in
Environmental Chemistry
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votes
28
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What is the molecular geometry of a molecule that has four bonding pairs and no lone pairs of electrons?
answered
5 days
ago
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Chemical bonding
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votes
26
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How can we synthesize a biodegradable polymer using renewable resources as starting materials, and what specific conditions and catalysts should be used in the reaction to achieve the desired properties of the polymer?
answered
Feb 14
in
Polymer Chemistry
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votes
28
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What is the hybridization of nitrogen in the compound NH3?
answered
Feb 13
in
Inorganic Chemistry
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38
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What is the oxidation state of each element in the compound NaClO3 (sodium chlorate)?
answered
Feb 13
in
Chemical reactions
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votes
46
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How can the properties of liquid crystals be optimized to improve the performance of display technology, such as increasing the resolution and reducing energy consumption?
answered
Feb 10
in
Materials Chemistry
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60
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Calculate the standard molar entropy change for the reaction: 2 SO2(g) + O2(g) → 2 SO3(g) at 298 K, given the following standard molar entropies: ΔS°(SO2(g)) = 248.2 J K^-1 mol^-1 ΔS°(O2(g)) = 205.0 J K^-1 mol^-1 ΔS°(SO3(g)) = 256.2 J K^-1 mol^-1
answered
Feb 3
in
Quantum Chemistry
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votes
11
views
How can a chemical engineer design a system for the production of natural flavors using sustainable and eco-friendly processes?
answered
Jan 30
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Chemical engineering
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votes
44
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How can gas chromatography be used to determine the composition of a mixture of two unknown compounds and what are the steps involved in the process?
answered
Jan 29
in
Analytical Chemistry
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votes
58
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Calculate the enthalpy of ionization of magnesium if 4.8 g of magnesium reacts completely with hydrochloric acid to form 224 mL of hydrogen gas at standard temperature and pressure (STP). The heat released during the reaction is -412 kJ/mol.
answered
Jan 23
in
ThermoChemistry
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votes
92
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A student conducted an electrolysis experiment using a current of 2 amperes for 30 minutes with a copper sulfate solution. What is the mass of copper deposited on the cathode? The atomic weight of copper is 63.546 g/mol and the Faraday constant is 96,485 C/mol.
answered
Jan 22
in
ElectroChemistry
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77
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A chemistry student needs to calculate the standard enthalpy change for the combustion reaction of methane gas (CH4) at 298 K and 1 atm pressure. The equation for the reaction is:CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l)Given the following standard enthalpies of formation at 298 K:ΔHf(CO2) = -393.5 kJ/molΔHf(H2O) = -285.8 kJ/molΔHf(CH4) = -74.8 kJ/molCalculate ΔHrxn, the standard enthalpy change for the combustion reaction of methane gas.
answered
Jan 22
in
Chemical thermodynamics
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52
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A chemistry student is asked to determine the concentration of a particular compound in a sample of drinking water. The student collects a 100 mL water sample and adds a known amount of a standard solution containing the compound. After allowing the solution to equilibrate, the student measures the concentration of the compound in the new solution using a spectrophotometer, to be 0.0125 M. Assuming mass balance, calculate the concentration of the compound in the original drinking water sample.
answered
Jan 22
in
Analytical Chemistry
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votes
59
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What is the difference between borderline personality disorder and narcissistic personality disorder?
answered
Jan 20
in
Psychology
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votes
32
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Compare and contrast the dynamic systems and Piagetian perspectives on cognitive development. Please evaluate which approach provides a more comprehensive understanding of cognitive development.
answered
Jan 20
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Psychology
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41
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What is the difference between an illusion and a hallucination according to the perceptual theory?
answered
Jan 17
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Psychology
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votes
37
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Where does the humanistic perspective focus in psychology?
answered
Jan 16
in
Psychology
0
votes
38
views
According to cognitive psychology, what is animal behaviour influenced by?
answered
Jan 16
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Psychology
0
votes
27
views
What is the difference between a leader and a manager?
answered
Jan 16
in
Psychology
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