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0
votes
25
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What conditions are necessary for the selective oxidation of methane on a metal surface to produce formaldehyde, and how does the presence of different metals affect the selectivity and activity of the reaction?
answered
1 day
ago
in
Surface Chemistry
0
votes
24
views
How does the selective oxidation of hydrocarbons on metal surfaces vary with changes in the surface structure and composition?
answered
1 day
ago
in
Surface Chemistry
0
votes
27
views
What is the optimum temperature and ratio of reactants needed to achieve maximum yield in the synthesis of polyacrylonitrile from acrylonitrile monomer using free-radical polymerization?
answered
4 days
ago
in
Chemical synthesis
0
votes
26
views
How does the molecular weight of a polymer affect its physical properties such as viscosity, tensile strength, and elasticity?
answered
4 days
ago
in
Physical Chemistry
0
votes
20
views
What is the maximum work that can be obtained from the irreversible expansion of an ideal gas at constant temperature and pressure?
answered
5 days
ago
in
Physical Chemistry
0
votes
20
views
What is the impact of pH and heavy metal concentrations in landfill leachate on groundwater quality and how can the leachate be treated using chemical methods to reduce these impacts?
answered
5 days
ago
in
Environmental Chemistry
0
votes
24
views
How does the behavior of a polymer system change as the concentration of solvent molecules is varied using Monte Carlo simulations?
answered
Feb 17
in
Computational Chemistry
0
votes
20
views
How does the adsorption energy of a nitrogen molecule on the surface of a metal catalyst change with the addition of a small amount of a second metal dopant, as predicted by density functional theory calculations?
answered
Feb 17
in
Computational Chemistry
0
votes
42
views
What are the hybrid orbitals in the molecule CH4 and how do they contribute to the overall structure and bonding of the molecule?
answered
Feb 13
in
Chemical bonding
0
votes
38
views
What is the role of hydrogen bonding in maintaining the stability of the double helix structure of DNA? How does the chemical structure of nucleotide bases allow for complementary base pairing and formation of base pairs?
answered
Feb 13
in
BioChemistry
0
votes
32
views
How can the concept of pH be applied to real-world scenarios such as understanding the acidity levels of common food and drinks and their effects on tooth decay?
answered
Feb 6
in
Chemical education
0
votes
62
views
What are the key properties and structural characteristics that make ceramics suitable for high-temperature applications, and how do these properties compare to those of other materials used at high temperatures?
answered
Jan 31
in
Materials Chemistry
0
votes
71
views
How much sodium chloride (NaCl) can be obtained from a sample of 5 grams of sea salt, given that the percentage of NaCl in the sample is 85% and gravimetric analysis is being used for the quantification?
answered
Jan 30
in
Analytical Chemistry
0
votes
55
views
Calculate the equilibrium constant (K) for the reaction that occurs when a nickel electrode is placed in a solution containing 1.0 M of nickel ions and 1.0 M of copper ions. The nickel electrode was placed in the solution, and the cell potential was measured to be 0.21 V at 25 °C.
answered
Jan 23
in
ElectroChemistry
0
votes
99
views
A container initially contains 0.10 mol of NOBr, 0.10 mol of NO, and 0.10 mol of Br2. If the system reaches equilibrium and the concentration of NOBr is found to be 0.075 M at that point, calculate the concentration of NO and Br2 at equilibrium.
answered
Jan 22
in
Chemical equilibrium
0
votes
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.
answered
Jan 22
in
Analytical Chemistry
0
votes
100
views
What is the identity of an unknown compound that shows a strong absorption at 1700 cm⁻¹ in its IR spectrum and displays a singlet at 2.2 ppm in its ¹H NMR spectrum?
answered
Jan 21
in
Organic Chemistry
0
votes
11
views
When applying the social learning theory in teaching, what should teachers consider?
answered
Jan 20
in
Psychology
0
votes
42
views
When was Spearman's rank correlation coefficient first introduced?
answered
Jan 20
in
Psychology
0
votes
40
views
Why is repeated measures ANOVA used?
answered
Jan 20
in
Psychology
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