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What is the optimum temperature and concentration of nitric acid needed to achieve a high yield in the preparation of 2,4,6-trinitrotoluene from toluene?
asked
Feb 22
in
Chemical synthesis
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votes
1
answer
27
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What is the optimal reaction conditions, including temperature and molar ratio, for the synthesis of nylon-6,6 from adipic acid and hexamethylenediamine to maximize yield and minimize side reactions?
asked
Feb 21
in
Chemical synthesis
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votes
1
answer
28
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What is the mechanism responsible for the phosphorescent properties of materials and how can this property be optimized for use in practical applications such as organic light-emitting diodes (OLEDs)?
asked
Feb 20
in
PhotoChemistry
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votes
0
answers
23
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What is the magnetic moment of [Fe(H2O)6]+3?
asked
Feb 20
in
Inorganic Chemistry
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1
answer
47
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How does the concentration of heavy metals in soil affect the growth and quality of crops?
asked
Feb 19
in
Environmental Chemistry
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votes
1
answer
36
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What is the balanced chemical equation for the preparation of 2,4-dinitrophenol from phenol and nitric acid, and what mass of nitric acid (in grams) is required to produce 25 grams of 2,4-dinitrophenol with a 90% yield?
asked
Feb 17
in
Chemical synthesis
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votes
1
answer
34
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What are the photochemical properties and mechanisms behind the effectiveness of various sunscreen agents, and how do these properties prevent UV radiation from damaging the skin?
asked
Feb 14
in
PhotoChemistry
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votes
1
answer
48
views
What is the complete mechanism of keto-enol tautomerism for the compound cyclohexanone, including the intermediate species and the transition state involved?
asked
Feb 13
in
Organic Chemistry
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1
answer
59
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How can we increase diversity in the chemistry field to ensure that a wide range of perspectives and experiences are represented, and encourage innovation in the industry?
asked
Feb 13
in
Chemical education
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votes
1
answer
55
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How can the process for the production of industrial gases such as hydrogen, oxygen, and nitrogen be optimized for maximum efficiency and yield in a chemical manufacturing plant?
asked
Feb 10
in
Chemical engineering
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votes
1
answer
102
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What is the difference between benzene and toluene in terms of aromaticity and reactivity with electrophiles?
asked
Jan 31
in
Organic Chemistry
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votes
1
answer
107
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How does the surface area, pore size, and pH of activated carbon affect its ability to adsorb pollutants such as volatile organic compounds (VOCs) from air or water?
asked
Jan 30
in
Surface Chemistry
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votes
1
answer
92
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What is the concentration of copper (II) ions in a sample of tap water using voltammetric analysis?
asked
Jan 30
in
Analytical Chemistry
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1
answer
79
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How can the concentration of a unknown substance in a solution be determined using colorimetry and a calibration curve?
asked
Jan 29
in
Analytical Chemistry
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1
answer
89
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Calculate the enthalpy change for the combustion of methane gas (CH4) if 37.0 g of CH4 is completely burned in a bomb calorimeter and the temperature increases by 285.4 K. Assume that the calorimeter has a heat capacity of 4.40 kJ/K and that the combustion reaction is as follows: CH4(g) + 2O2(g) -> CO2(g) + 2H2O(l); ΔH=-890.4 kJ/mol. What is the enthalpy change for the combustion of one mole of methane gas?
asked
Jan 23
in
Chemical reactions
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votes
1
answer
78
views
A student is given a mixture of two unknown substances, one organic and one inorganic, and is asked to identify these compounds using mass spectrometry. Can you provide a step-by-step procedure using mass spectrometry to identify the two unknown compounds?
asked
Jan 22
in
Analytical Chemistry
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1
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51
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What are the implications of Vygotsky's theory for education?
asked
Jan 20
in
Psychology
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votes
1
answer
116
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According to the dual-process model, what are the two types of coping strategies for dealing with trauma?
asked
Jan 17
in
Psychology
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1
answer
91
views
What is a z-score?
asked
Jan 17
in
Psychology
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votes
1
answer
57
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Where may the evolutionary theory be critiqued?
asked
Jan 16
in
Psychology
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