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What is the impact of varying light intensities on the rate of a specific photochemical reaction (e.g. the reaction between hydrogen and chlorine gas to form hydrogen chloride)?
answered
Feb 20
in
PhotoChemistry
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votes
41
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How does the charge of colloidal particles affect their interaction with each other and their stability in a solution? Discuss the role of electrostatic and van der Waals interactions in determining the behavior of colloidal particles.
answered
Feb 18
in
Physical Chemistry
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28
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What is the best method for preparing 2-chloro-4-nitroaniline from aniline and chlorine gas, and what are the optimal reaction conditions (temperature, pressure, reaction time, etc.) to obtain the highest yield of the desired product?
answered
Feb 17
in
Chemical synthesis
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64
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What is the effect of increasing the pH of a solution on the equilibrium position of a redox reaction where Fe2+ is oxidized to Fe3+ ions? Provide an explanation for your answer and justify your reasoning using Le Chatelier’s principle.
answered
Feb 13
in
Chemical equilibrium
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44
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Identify and explain the structural differences between cis-2-butene and trans-2-butene, and predict how these isomers would react differently in a chemical reaction with hydrogen gas.
answered
Feb 12
in
Organic Chemistry
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63
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Design a heat exchanger that can effectively transfer heat between a hot stream of ethanol with a flow rate of 2 kg/s and a cold stream of water with a flow rate of 5 kg/s. The inlet temperature of ethanol is 80°C, while the inlet temperature of water is 20°C. The outlet temperature of ethanol should be 30°C, while the outlet temperature of water should not exceed 35°C. The heat exchanger should have a heat transfer coefficient of at least 500 W/m^2K and a total surface area of no more than 10 m^2.
answered
Feb 4
in
Chemical engineering
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63
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Calculate the standard enthalpy change of the formation reaction for carbon dioxide (CO2) given the standard enthalpies of formation for carbon monoxide (CO) and oxygen gas (O2) as -110.5 kJ/mol and -249.2 kJ/mol, respectively.
answered
Feb 3
in
Chemical thermodynamics
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65
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Calculate the standard enthalpy change for the precipitation reaction that occurs when 100 mL of 0.2 M lead nitrate solution reacts with 100 mL of 0.1 M sodium iodide solution to form solid lead iodide and aqueous sodium nitrate. The balanced chemical equation for the reaction is:Pb(NO3)2(aq) + 2 NaI(aq) → PbI2(s) + 2 NaNO3(aq)Given: - Molar mass of Pb(NO3)2 = 331.20 g/mol - Molar mass of NaI = 149.89 g/mol - Density of 0.2 M lead nitrate solution = 1.055 g/mL - Density of 0.1 M sodium iodide solution = 1.04 g/mL - Specific heat capacity of the reaction mixture is 4.18 J/(g · °C) - The initial temperature of the reaction mixture and the surroundings is 25 °C.
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Feb 3
in
Chemical thermodynamics
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44
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Why is the humanistic perspective important for understanding motivation and personal growth?
answered
Jan 20
in
Psychology
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votes
43
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What are the strengths of the Volley Theory?
answered
Jan 16
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Psychology
0
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110
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Why is explanatory power important in theory evaluation?
answered
Jan 15
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Psychology
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50
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What are the limitations of using a hypothesis?
answered
Jan 15
in
Psychology
0
votes
72
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What is the difference between a just noticeable difference and a difference threshold?
answered
Jan 15
in
Psychology
0
votes
50
views
What is the meaning of death anxiety?
answered
Jan 15
in
Psychology
0
votes
76
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What is the purpose of a control group?
answered
Jan 15
in
Psychology
0
votes
104
views
What is the difference between an open and closed group?
answered
Jan 14
in
Psychology
0
votes
80
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What is the main goal of solution-focused brief therapy?
answered
Jan 14
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Psychology
0
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49
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What is divided attention?
answered
Jan 13
in
Psychology
0
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95
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Why are continents unable to be pushed down into the mantle by plate boundaries?
answered
Jan 8
in
Science
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93
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What type of taste do bases normally have?
answered
Jan 8
in
Science
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