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0
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26
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What is the optimal temperature and pressure condition for the synthesis of polyethylene oxide from ethylene oxide monomer, and how does varying these conditions affect the product's molecular weight and properties?
answered
Feb 21
in
Chemical synthesis
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votes
36
views
What is the effect of the degree of crosslinking on the water absorption capacity of polymer-based superabsorbent materials?
answered
Feb 19
in
Polymer Chemistry
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31
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How does the degradation of polymers affect their stability over time? Specifically, investigate the effects of environmental factors, such as temperature, humidity, and UV exposure on the rate of degradation and stability of different types of polymers.
answered
Feb 19
in
Polymer Chemistry
0
votes
32
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How does surface modification of polymers affect the adhesive properties of polymer-based materials?
answered
Feb 17
in
Surface Chemistry
0
votes
29
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How does surface modification of nanoparticles affect their reactivity and stability in various chemical reactions? Please provide specific examples and supporting evidence from recent research studies.
answered
Feb 17
in
Surface Chemistry
0
votes
88
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How does changing the pH affect the equilibrium position of a redox reaction between iron (II) and dichromate ions in acidic and basic solutions? Provide a balanced chemical equation and explain your reasoning using Le Chatelier's principle.
answered
Feb 13
in
Chemical equilibrium
0
votes
66
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How can the synthesis of metal nanoparticles using eco-friendly methods be improved for better yield and size control?
answered
Feb 11
in
Materials Chemistry
0
votes
69
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How can the properties of existing drugs or natural compounds be modified to produce more effective treatments for cardiovascular diseases?
answered
Feb 10
in
Medicinal Chemistry
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votes
45
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How can inadequate preparation for chemistry exams impact a student's grades and overall academic performance? Specifically, what study methods and strategies can be employed to improve understanding and retention of key concepts in chemistry?
answered
Feb 5
in
Chemical education
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votes
74
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Calculate the standard enthalpy change (ΔH°) for the reaction of combustion of 1 mole of ethanol (C2H5OH) given that the standard enthalpy of formation (ΔH°f) for ethanol and carbon dioxide (CO2) are -277.7 kJ/mol and -393.5 kJ/mol respectively, and the standard enthalpy of formation (ΔH°f) for water (H2O) is -285.8 kJ/mol. The balanced chemical equation for the reaction is as follows:C2H5OH (l) + 3 O2 (g) → 2 CO2 (g) + 3 H2O (l)
answered
Feb 3
in
Chemical thermodynamics
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20
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Calculate the rate constant at 300 K for a gas phase reaction with a rate of 0.025 M/s and an initial concentration of 0.10 M. The reaction is second order in the concentration of reactants.
answered
Feb 3
in
Physical Chemistry
0
votes
114
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What is the effect of a change in pH on the structure and function of proteins?
answered
Jan 30
in
BioChemistry
0
votes
110
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How can we use ion-selective electrodes to determine the concentration of fluoride ions in a solution and what factors can affect the accuracy of this measurement?
answered
Jan 30
in
Analytical Chemistry
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47
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Who proposed the theory of positive psychology?
answered
Jan 20
in
Psychology
0
votes
68
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When does the Cognitive Apprenticeship Model suggest scaffolding should be used?
answered
Jan 15
in
Psychology
0
votes
34
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What is the role of self-efficacy in leadership?
answered
Jan 15
in
Psychology
0
votes
59
views
What is the dual-process theory of moral judgment?
answered
Jan 14
in
Psychology
0
votes
41
views
What are the key differences between REM and NREM sleep?
answered
Jan 14
in
Psychology
0
votes
126
views
Which process is glycolysis in during cellular respiration?
answered
Jan 8
in
Science
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80
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Which type of double bond has a sigma bond and a pi bond?
answered
Jan 8
in
Science
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