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0
votes
28
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What is the effect of varying pH levels on the reaction rate of the reaction between hydrochloric acid (HCl) and sodium thiosulfate (Na2S2O3)?
answered
Feb 22
in
Chemical kinetics
0
votes
27
views
What is the optimal ratio of adipic acid to hexamethylenediamine that should be used in the synthesis of nylon-6,6 for maximum yield?
answered
Feb 21
in
Chemical synthesis
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votes
30
views
How does the molecular weight of a polymer affect its viscosity and shear rate in a melt, and what implications does this have on industrial processes such as injection molding?
answered
Feb 21
in
Polymer Chemistry
0
votes
35
views
What is the heat of formation of hydrogen chloride (HCl) if the enthalpy change of the reaction 2H2(g) + Cl2(g) -> 2HCl(g) is -184.6 kJ/mol?
answered
Feb 20
in
Chemical bonding
0
votes
33
views
What is the energy required to break the bond between two oxygen atoms in a molecule of O2, given that the bond energy of an O-O bond is 498 kJ/mol?
answered
Feb 20
in
Chemical reactions
0
votes
68
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How can the synthesis of carbon nanotubes be optimized to improve their mechanical strength and electrical conductivity for their use in electronic devices and composite materials?
answered
Feb 11
in
Materials Chemistry
0
votes
105
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Using computational methods, calculate the standard enthalpy of formation and the standard entropy of CH4(g) at 298 K. How does the calculated enthalpy and entropy values compare to the experimental values? Provide a possible explanation for any discrepancies between the two values.
answered
Jan 31
in
Quantum Chemistry
0
votes
79
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Calculate the equilibrium constant (Kc) for the reaction: 2A(g) + B(g) ⇌ C(g) + D(g), if the concentration of A is 0.25 M, the concentration of B is 0.10 M, the concentration of C is 0.30 M and the concentration of D is 0.20 M at equilibrium.
answered
Jan 23
in
Chemical thermodynamics
0
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66
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Calculate the change in enthalpy (ΔH) for the combustion of methane gas (CH4) at 25°C and constant pressure of 1 atm. The equation for the combustion of methane is:CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) Given the standard enthalpies of formation at 25°C are:ΔHf[CH4 (g)] = -74.87 kJ/mol ΔHf[CO2 (g)] = -393.5 kJ/mol ΔHf[H2O (l)] = -285.8 kJ/mol Assume that water is in its liquid phase at the end of the reaction.
answered
Jan 23
in
Physical Chemistry
0
votes
42
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Where did the concept of 'existential angst' originate?
answered
Jan 20
in
Psychology
0
votes
39
views
What is a pilot study?
answered
Jan 16
in
Psychology
0
votes
29
views
When analysing cognitive theories, what is the significance of ecological fallacy?
answered
Jan 16
in
Psychology
0
votes
65
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What is the criticism of ethology?
answered
Jan 16
in
Psychology
0
votes
50
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When evaluating the four-factor model of grief, what strength can be pointed out?
answered
Jan 15
in
Psychology
0
votes
14
views
What is the goal of qualitative research?
answered
Jan 15
in
Psychology
0
votes
60
views
What are internalising behaviours?
answered
Jan 14
in
Psychology
0
votes
36
views
What kind of water are cattails adapted for with narrow, strap-like leaves?
answered
Jan 7
in
Science
0
votes
86
views
What is the outer layer of skin, consisting almost entirely of epithelial cells?
answered
Jan 7
in
Science
0
votes
82
views
What is responsible for many properties of covalent compounds, which have relatively low boiling points, cannot conduct electricity, and may not dissolve in water?
answered
Jan 6
in
Science
0
votes
91
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What does the coefficient in front of an element in a formula indicate?
answered
Jan 6
in
Science
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