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26
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What is the mechanism of action by which sunscreen agents protect the skin from harmful UV radiation, and how does this vary among different types of sunscreen agents?
asked
Feb 14
in
PhotoChemistry
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votes
1
answer
24
views
How can we predict the catalytic activity and selectivity of a given catalyst for a specific chemical reaction using quantum chemistry calculations?
asked
Feb 14
in
Quantum Chemistry
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votes
1
answer
33
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How can we optimize the drug design process to create new and effective treatments for viral infections that target specific viral proteins or enzymes without harming human cells?
asked
Feb 14
in
Medicinal Chemistry
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votes
1
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28
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How can the efficiency of a hydrogen fuel production system be optimized using chemical engineering principles and techniques to minimize energy consumption and maximize yield while maintaining a safe and sustainable process?
asked
Feb 7
in
Chemical engineering
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votes
1
answer
39
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How can improving the polymer electrolyte in a lithium-ion battery affect its performance and stability over time?
asked
Feb 6
in
Polymer Chemistry
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1
answer
41
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How can chemistry teachers incorporate more practical applications of chemistry into their lessons to help students better understand the real-world relevance of the subject? Give specific examples of practical applications that could be included in high school chemistry curricula.
asked
Feb 5
in
Chemical education
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1
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55
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Calculate the standard enthalpy change for the vaporization reaction of 2.00 moles of water at 100°C and 1 atm pressure, given that the molar enthalpy of vaporization of water is 40.7 kJ/mol.
asked
Feb 3
in
Chemical thermodynamics
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votes
1
answer
53
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Calculate the standard electrode potential of the following reaction: Cu2+(aq) + 2e- ⇌ Cu(s) Given that the standard reduction potential of Cu2+(aq) is +0.34 V and the standard electrode potential of hydrogen electrode is 0.00 V.
asked
Feb 3
in
Chemical thermodynamics
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1
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51
views
How has the Clean Air Act affected air quality in the United States over the past decade?
asked
Jan 31
in
Environmental Chemistry
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10
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A chemistry student wants to determine the percentage of ethanol in a sample of wine. The student takes a 50 mL aliquot of the wine, dries it, and finds the weight of the residual solids to be 0.325 g. The student then distills the rest of the wine, evaporates the distillate to dryness, and finds the weight of the residue to be 2.324 g. Using mass balance calculations, what is the percentage of ethanol in the wine sample?
asked
Jan 22
in
Analytical Chemistry
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1
answer
73
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A chemistry student wants to create a buffer solution with a pH of 7.2 using acetic acid and sodium acetate. The student has calculated that they need 0.1 moles of each component to make a 250 mL buffer solution. However, the student accidentally added 0.02 moles of hydrochloric acid to the buffer solution. Calculate the new pH of the buffer solution and explain if the addition of the hydrochloric acid has shifted the equilibrium position of the reaction towards the acid or the base.
asked
Jan 22
in
Chemical equilibrium
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1
answer
21
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According to Pauli's archetype theory, what is the shadow?
asked
Jan 20
in
Psychology
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1
answer
27
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Who benefits from a community psychology approach?
asked
Jan 20
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Psychology
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votes
1
answer
34
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What is the focus of the Cognitive approach?
asked
Jan 15
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Psychology
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votes
1
answer
25
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Can computational models fully explain human behaviour?
asked
Jan 15
in
Psychology
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votes
1
answer
39
views
What is the difference between a sensation and a perception?
asked
Jan 15
in
Psychology
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votes
1
answer
60
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Who is Jean Piaget?
asked
Jan 13
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Psychology
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votes
1
answer
16
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Within the chloroplast, synthesis of what takes place in the fluid inside the inner membrane called the stroma?
asked
Jan 8
in
Science
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votes
1
answer
41
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Which organ has a thick mucus lining that protects the underlying tissue from the action of the digestive juices?
asked
Jan 8
in
Science
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1
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71
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Which is the active ingredient of cereal crop disease, ergot?
asked
Jan 8
in
Science
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