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Questions by TommyBarfiel
0
votes
1
answer
30
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Using retrosynthesis, propose a viable pathway for the synthesis of Ibuprofen from readily available starting materials.
asked
Feb 13
in
Organic Chemistry
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votes
1
answer
39
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How can the stability of an emulsion be improved using a specific surfactant?
asked
Feb 10
in
Surface Chemistry
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1
answer
24
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How can the efficiency of the production process for the pharmaceutical drug be optimized with the use of catalysts?
asked
Feb 7
in
Chemical engineering
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1
answer
41
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Calculate the polarization that occurs in an electrochemical cell when a current of 2 A flows through it for 10 minutes. The electrode area is 25 cm², and the current efficiency is 95%. The activation energy is 80 kJ/mol, and the reaction quotient is 2.5 x 10⁻⁵. The temperature of the cell is 25°C. Find the polarization resistance and the total polarization of the cell.
asked
Feb 3
in
ElectroChemistry
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1
answer
44
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How does changing the stoichiometric ratio of reactants affect the reaction rate of the chemical reaction between acid and calcium carbonate?
asked
Feb 3
in
Chemical kinetics
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1
answer
68
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What is the chemical structure of an unknown compound based on its infrared spectrum, where a peak is observed at 3500 cm^-1 and no peaks are observed between 1600-1800 cm^-1?
asked
Jan 31
in
Physical Chemistry
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1
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12
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What is the concentration of copper ions present in a sample if the absorbance value is 0.345 and the path length is 1 cm? The molar absorptivity of copper ions is known to be 4.58 x 10^4 L mol^-1 cm^-1 at a wavelength of 600 nm in spectrophotometry.
asked
Jan 30
in
Analytical Chemistry
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1
answer
91
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How can X-ray fluorescence spectroscopy be used to identify the presence of specific elements in a sample with a high degree of accuracy and precision?
asked
Jan 30
in
Analytical Chemistry
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1
answer
61
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Calculate the enthalpy of adsorption of 1 mole of hydrogen gas on the surface of activated charcoal from the given data:- The heat of combustion of hydrogen gas at constant volume is -285.8 kJ/mol- The heat of combustion of hydrogen gas at constant pressure is -241.8 kJ/mol- The heat of vaporization of hydrogen gas at its boiling point (20.3 K) is 0.452 kJ/mol- The surface area of activated charcoal is 500 m²/g- The weight of activated charcoal used is 0.5 g.
asked
Jan 23
in
ThermoChemistry
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1
answer
64
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Calculate the enthalpy change for the following reaction, using Hess's Law:2H2S(g) + 3O2(g) → 2H2O(l) + 2SO2(g)Given the following enthalpy changes: 2H2(g) + O2(g) → 2H2O(l) ΔH1 = -484 kJ2SO2(g) + O2(g) → 2SO3(g) ΔH2 = -198 kJ2H2(g) + S(s) → H2S(g) ΔH3 = +25kJ
asked
Jan 23
in
Chemical reactions
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1
answer
78
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A student needs to determine the enthalpy change (ΔH) for the reaction between ammonium nitrate (NH4NO3) and water (H2O) using Hess's Law calculations. Given the following information: - ΔHf° (NH4NO3) = -365.4 kJ/mol- ΔHf° (HNO3) = -207.3 kJ/mol- ΔHf° (NH4+) = -132.5 kJ/mol- ΔHf° (NO3-) = -206.1 kJ/mol- ΔHf° (H2O) = -285.83 kJ/molFormulate the thermochemical equation for the reaction by using the given data and Hess's Law calculations, and then calculate the enthalpy change for the reaction.
asked
Jan 22
in
ThermoChemistry
0
votes
1
answer
42
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Who came up with the concept of the id, ego, and superego?
asked
Jan 20
in
Psychology
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1
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31
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When applying social identity theory in parenting, what is suggested for parents?
asked
Jan 17
in
Psychology
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1
answer
31
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According to the Reactance Theory, what happens when people perceive a threat to their freedom?
asked
Jan 17
in
Psychology
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votes
1
answer
22
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What is a heuristic?
asked
Jan 17
in
Psychology
0
votes
1
answer
38
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Please list some of the reasons why cultural differences in psychological research can affect results.
asked
Jan 16
in
Psychology
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votes
1
answer
42
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Who advocated for positivism as a research philosophy?
asked
Jan 16
in
Psychology
0
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1
answer
10
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What is bias in research?
asked
Jan 16
in
Psychology
0
votes
1
answer
42
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What is the Bioecological Model of Human Development?
asked
Jan 15
in
Psychology
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1
answer
59
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What theory suggests that unconscious thoughts and experiences influence people's behaviour?
asked
Jan 15
in
Psychology
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