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30
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How do the rheological properties of polymer melts vary with changes in temperature and molecular weight?
answered
Feb 24
in
Polymer Chemistry
0
votes
31
views
What is the effect of increasing the temperature on the equilibrium constant of the reaction between hydrogen gas and iodine gas to form hydrogen iodide gas, and how does this relate to the reaction rate?
answered
Feb 22
in
Chemical kinetics
0
votes
31
views
What are the photochemical properties of the most commonly used photovoltaic materials and how do these properties affect the efficiency of the solar cells they are used in?
answered
Feb 21
in
PhotoChemistry
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27
views
What is the effect of the excitation wavelength on the fluorescence emission of a specific molecule or material?
answered
Feb 20
in
Quantum Chemistry
0
votes
26
views
How does the crystallization rate and morphology of a polymer change with changes in processing conditions such as cooling rate, pressure, and concentration of the polymer solution?
answered
Feb 19
in
Polymer Chemistry
0
votes
37
views
How can chemistry teachers spark interest in the subject among students who perceive it as difficult and uninteresting?
answered
Feb 6
in
Chemical education
0
votes
78
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Here is a precise question for the student to solve:A student performed an electroplating experiment of copper metal onto an electrode by passing a constant current of 1.5 A through a solution of copper(II) sulfate for 50 minutes. If the mass of the copper metal obtained was 1.23 grams, calculate the Faraday constant using the following formula: Faraday constant = (mass of substance plated x molar mass of substance) / (current x time)
answered
Feb 4
in
ElectroChemistry
0
votes
70
views
Determine the rate law for the reaction of nitrogen dioxide with hydrogen gas, if the reaction rate is directly proportional to the concentration of nitrogen dioxide and the square of the concentration of hydrogen gas. Express the rate law in terms of the rate constant and the concentrations of the reactants.
answered
Feb 4
in
Chemical kinetics
0
votes
44
views
How does the mechanism of carbon fixation during photosynthesis in plants involve the enzymes ribulose bisphosphate carboxylase-oxygenase (RuBisCO) and phosphoenolpyruvate carboxylase (PEPC) and what is its significance in the contribution of atmospheric CO2 absorption?
answered
Jan 31
in
BioChemistry
0
votes
107
views
What is the concentration of copper ions in a sample of wastewater collected from a factory using cyclic voltammetry?
answered
Jan 30
in
Analytical Chemistry
0
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80
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Calculate the Gibbs free energy change at 25°C for the reaction:2NO(g) + O2(g) → 2NO2(g)Given the standard Gibbs free energy of formation at 25°C for NO(g), O2(g), and NO2(g) are +86.4 kJ/mol, 0 kJ/mol, and +51.3 kJ/mol, respectively.
answered
Jan 23
in
Chemical thermodynamics
0
votes
111
views
What is the pKa of acetic acid (CH3COOH) and how is it affected by the presence of an electron-withdrawing group on the adjacent carbon atom?
answered
Jan 21
in
Organic Chemistry
0
votes
75
views
When was the concept of social loafing first identified?
answered
Jan 20
in
Psychology
0
votes
45
views
What is reinforcement learning?
answered
Jan 20
in
Psychology
0
votes
47
views
Who developed the humanistic theory of personality disorders?
answered
Jan 16
in
Psychology
0
votes
35
views
How does the social identity theory explain group polarisation?
answered
Jan 15
in
Psychology
0
votes
90
views
What is feature detection in psychology?
answered
Jan 15
in
Psychology
0
votes
41
views
What is a placebo effect?
answered
Jan 13
in
Psychology
0
votes
58
views
Which theory is the idea that the characteristics of living organisms are controlled by genes, which are passed from parents to their offspring?
answered
Jan 8
in
Science
0
votes
90
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What takes over the synthesis and secretion of progesterone throughout pregnancy as the corpus luteum degenerates?
answered
Jan 7
in
Science
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