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0
votes
1
answer
24
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How does the presence of heavy metals such as lead and mercury in soil and water sources affect the growth and survival of aquatic plants, and what are some effective methods for reducing heavy metal toxicity in the environment?
asked
4 days
ago
in
Environmental Chemistry
0
votes
1
answer
21
views
How does the concentration of greenhouse gases affect the temperature of Earth's atmosphere?
asked
Feb 19
in
Environmental Chemistry
0
votes
1
answer
27
views
How does the choice of exchange-correlation functional affect the accuracy of Density Functional Theory (DFT) calculations of the catalytic reaction mechanism of a specific chemical compound?
asked
Feb 18
in
Computational Chemistry
0
votes
1
answer
27
views
How does the addition of functional groups such as oxygen, nitrogen or sulfur affect the electronic properties of graphene and its potential use in electronic devices?
asked
Feb 17
in
Materials Chemistry
0
votes
1
answer
51
views
How can the stability of an emulsion be enhanced using surfactants and what factors affect the stability of the emulsion?
asked
Feb 10
in
Surface Chemistry
0
votes
1
answer
44
views
How can the SERS technique be used to study the adsorption process of organic molecules on metal surfaces?
asked
Feb 10
in
Surface Chemistry
0
votes
1
answer
40
views
How can the process of ethylene polymerization be optimized to produce high molecular weight and high-density polyethylene while maintaining control over the reaction and reducing unwanted side reactions?
asked
Feb 10
in
Chemical synthesis
0
votes
1
answer
34
views
How can chemistry students carry out hands-on experiments at home or in a limited-resource school setting with limited access to laboratory equipment and chemicals?
asked
Feb 4
in
Chemical education
0
votes
1
answer
42
views
Determine the critical micelle concentration of the sodium dodecyl sulfate (SDS) in water by plotting the surface tension of SDS solutions at different concentrations.
asked
Feb 4
in
Surface Chemistry
0
votes
1
answer
53
views
How does changing the surface chemistry of a solid surface affect the adsorption of proteins, and how can this knowledge be applied to improve biomaterials design for medical implants?
asked
Feb 3
in
Surface Chemistry
0
votes
1
answer
83
views
What is the percent composition of carbon, hydrogen, and nitrogen in a 10 gram sample of caffeine? Use elemental analysis to determine the answer.
asked
Jan 31
in
Analytical Chemistry
0
votes
1
answer
70
views
What are the possible ways to simplify the teaching of complex chemical concepts to make them more understandable to students?
asked
Jan 30
in
Chemical education
0
votes
1
answer
89
views
A student received a sample of an unknown substance weighing 5 grams. After performing a series of measurements, they found that the sample contained 2.5 grams of pure calcium carbonate and an unknown amount of impurities. Using mass balance calculations, determine the weight and composition of the impurities in the sample.
asked
Jan 22
in
Analytical Chemistry
0
votes
1
answer
58
views
A gas is contained in a cylinder at a pressure of 1 atm and a temperature of 25°C. The cylinder is fitted with a piston that can be moved to change the volume. The gas is allowed to expand irreversibly to a final pressure of 0.5 atm, and the temperature is kept constant. Calculate the work done by the system, and determine if the process is endothermic or exothermic.
asked
Jan 22
in
Physical Chemistry
0
votes
1
answer
59
views
A chemistry student wants to determine the reaction rate of a chemical reaction. They mix 8 grams of reactant A with 12 grams of reactant B in a beaker at room temperature. After 10 seconds, they observe that the mass of the beaker's contents has decreased by 2 grams. What is the reaction rate of the chemical reaction?
asked
Jan 22
in
Chemical reactions
0
votes
1
answer
62
views
A chemistry student wants to determine the percent composition of calcium oxide in a given sample of limestone. The student does an experiment and obtains the mass of the limestone sample, the mass of carbon dioxide evolved upon heating the limestone, and the mass of calcium oxide left behind. Using mass balance calculations, determine the percent composition of calcium oxide in the limestone sample.
asked
Jan 22
in
Analytical Chemistry
+1
vote
1
answer
12
views
Why is validity important in experimental research?
asked
Jan 20
in
Psychology
0
votes
1
answer
38
views
When evaluating a theory, what is the criterion for precision?
asked
Jan 20
in
Psychology
0
votes
1
answer
44
views
Where does psychodynamic therapy originate?
asked
Jan 20
in
Psychology
0
votes
1
answer
65
views
According to the social exchange theory, why do individuals engage in social relationships?
asked
Jan 17
in
Psychology
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