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0
votes
1
answer
23
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What is the most efficient catalyst to use in the synthesis of polyethylene terephthalate from terephthalic acid and ethylene glycol, and how does varying the amount of catalyst affect the yield and quality of the final product?
asked
4 days
ago
in
Chemical synthesis
0
votes
1
answer
26
views
How does the degree of crystallinity affect the mechanical properties of a polymer?
asked
6 days
ago
in
Polymer Chemistry
0
votes
1
answer
24
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What is the critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS) in water at different temperatures, and how does it vary with the change in pH of the solution?
asked
6 days
ago
in
Surface Chemistry
0
votes
1
answer
30
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How does the enzyme RuBisCO catalyze the fixation of carbon dioxide during photosynthesis, and what factors affect its activity?
asked
Feb 14
in
BioChemistry
0
votes
1
answer
33
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How do the photochemical properties of quantum dots change with variations in their size and composition?
asked
Feb 14
in
PhotoChemistry
0
votes
1
answer
28
views
What is the effect of microplastics on the bioaccumulation of toxins in marine organisms?
asked
Feb 13
in
Environmental Chemistry
0
votes
1
answer
29
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What are the synthetic methods used to prepare metallofullerenes and metalloclusters, and how do the properties of the metal centers affect the electronic and steric structures of the resulting complexes?
asked
Feb 13
in
Coordination Chemistry
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votes
1
answer
4
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Which isomer, cisplatin or transplatin, is more effective in treating cancer and how does the isomerism of the coordination compound affect its biological activity?
asked
Feb 12
in
Coordination Chemistry
0
votes
1
answer
45
views
Calculate the standard enthalpy change for the precipitation reaction between 70.0 mL of 0.500 M lead(II) nitrate solution and excess sodium iodide solution at 25°C, if the resulting precipitate is PbI2 and the specific heat capacity of the solution is 4.18 J g^-1°C^-1.
asked
Feb 3
in
Chemical thermodynamics
0
votes
1
answer
49
views
Calculate the lattice energy of magnesium oxide (MgO) given that the lattice enthalpy of magnesium (Mg) is 3944 kJ/mol and that of oxygen (O) is 751 kJ/mol.
asked
Jan 23
in
Inorganic Chemistry
0
votes
1
answer
54
views
Calculate the enthalpy change for the polymerization of propylene to polypropylene, given the enthalpy of formation of propylene is -103.8 kJ/mol and the enthalpy of formation of polypropylene is -45.4 kJ/mol. Assume the reaction occurs at constant pressure and temperature.
asked
Jan 23
in
ThermoChemistry
0
votes
1
answer
64
views
Calculate the bond order and bond length of the nitrogen-oxygen bond in nitric oxide (NO).
asked
Jan 23
in
Inorganic Chemistry
0
votes
1
answer
50
views
A student wants to determine the ionization constant of a weak acid. They use the initial concentration and the pH of the solution at a given temperature to calculate the ionization constant. Given that the temperature of the solution is changed by 10°C, how will this affect the ionization constant of the weak acid? Calculate the new ionization constant at the new temperature assuming that no additional acid or base is added to the solution.
asked
Jan 22
in
Chemical equilibrium
0
votes
1
answer
92
views
A chemistry student is given the following thermochemical equations: Equation 1: H2 (g) + 1/2O2 (g) → H2O(l) ΔH1 = -285.8 kJ/mol Equation 2: C(s) + O2 (g) → CO2 (g) ΔH2 = -393.5 kJ/mol Equation 3: 2H2 (g) + O2 (g) → 2H2O(l) ΔH3 = -571.6 kJ/mol Using Hess's Law, calculate the enthalpy change for the following reaction: C(s) + 2H2 (g) → CH4 (g)
asked
Jan 22
in
ThermoChemistry
0
votes
1
answer
85
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What is the correct IUPAC name of the following organic compound: CH3-CH2-CH(CH3)-CH2-Br?
asked
Jan 21
in
Organic Chemistry
0
votes
1
answer
38
views
What is the Foot-In-The-Door Technique?
asked
Jan 20
in
Psychology
0
votes
1
answer
31
views
According to Horney's psychodynamic theory, what is basic anxiety?
asked
Jan 17
in
Psychology
0
votes
1
answer
38
views
According to the diathesis-stress model, how do genetic predispositions and environmental stressors interact in the development of PTSD?
asked
Jan 17
in
Psychology
0
votes
1
answer
20
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Please evaluate the spotlight model of attention.
asked
Jan 16
in
Psychology
0
votes
1
answer
13
views
What is the role of culture in adolescent identity formation according to Cultural Identity Theory?
asked
Jan 15
in
Psychology
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