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Answers by HazelAvelar
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What are the photochemical properties of the photochromic material used in transition lenses, and how do they cause the lenses to darken when exposed to sunlight, and then lighten when the sunlight is removed?
answered
4 days
ago
in
PhotoChemistry
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votes
22
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How does the particle size of a colloidal solution affect its color intensity and stability?
answered
4 days
ago
in
Physical Chemistry
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22
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What is the optimal temperature and pressure conditions for the synthesis of polyethylene oxide with a desired molecular weight using ethylene oxide monomer as the raw material?
answered
4 days
ago
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Chemical synthesis
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votes
22
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What is the most effective metal catalyst and reaction conditions for selective oxidation of methane to methanol on metal surfaces?
answered
4 days
ago
in
Surface Chemistry
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votes
23
views
How does the molecular weight and composition of a polymer affect its properties for use in 3D printing?
answered
4 days
ago
in
Materials Chemistry
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votes
22
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What is the effect of temperature on the critical micelle concentration (CMC) of a surfactant and how does it relate to the physical properties of the micelles formed?
answered
6 days
ago
in
Surface Chemistry
0
votes
28
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What is the effect of substrate concentration on the rate of enzyme-catalyzed reactions, and how does the presence of an inhibitor (competitive or non-competitive) affect this relationship?
answered
6 days
ago
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BioChemistry
0
votes
29
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What is the effect of increasing the temperature from 25°C to 50°C on the equilibrium constant of the following exothermic reaction?N₂(g) + 3H₂(g) ⇌ 2NH₃(g) + heat
answered
6 days
ago
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Chemical equilibrium
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votes
20
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What is the effect of different light intensities (measured in lux) on the reaction rate of the bleaching of a food coloring solution using hydrogen peroxide and potassium iodide as catalysts?
answered
6 days
ago
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Chemical kinetics
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votes
30
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What is the dipole moment of carbon dioxide and how does it differ from the dipole moment of water? Use your knowledge of the molecular geometry and bond polarity of these molecules to explain their dipole moments.
answered
6 days
ago
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Chemical bonding
0
votes
37
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Identify the type of solid (ionic, covalent, or metallic) for the compound ZnO. Provide a detailed explanation and evidence to support your answer.
answered
Feb 18
in
Inorganic Chemistry
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34
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What is the effect of changing the molecular structure of a liquid crystal on its thermal properties, such as melting point and heat capacity, as predicted by Monte Carlo simulations?
answered
Feb 3
in
Computational Chemistry
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72
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How can a chemistry student effectively conduct experiments and learn practical skills with limited access to laboratory equipment and facilities?
answered
Jan 30
in
Chemical education
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74
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Calculate the enthalpy of solution for the dissolution of 15g of potassium chloride (KCl) in 100g of water (H2O) given that the temperature change was -12.5°C. The enthalpy of fusion for KCl is 17.2 kJ/mol and the specific heat capacity of water is 4.18 J/g•°C.
answered
Jan 23
in
ThermoChemistry
0
votes
64
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Calculate the enthalpy change for the hydrolysis of 0.025 moles of ethyl acetate (C4H8O2) in the presence of excess water, given that the enthalpy of reaction is -56.0 kJ/mol.
answered
Jan 23
in
ThermoChemistry
0
votes
67
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Calculate the bond dissociation energy for the H-H bond in a diatomic hydrogen molecule, given that the enthalpy change for the reaction H2(g) → 2 H(g) is 436 kJ/mol.
answered
Jan 23
in
ThermoChemistry
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11
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Consider the following equation: Fe + HCl --> FeCl3 + H2. If you have 10 grams of Fe and an excess of HCl, what mass of H2 will be produced?
answered
Jan 21
in
Inorganic Chemistry
0
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66
views
According to Maslow's hierarchy of needs, what are the five levels of human needs?
answered
Jan 20
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Psychology
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votes
23
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Where did the concept of anxiety originate?
answered
Jan 20
in
Psychology
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votes
39
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How might social identity theory be relevant to end-of-life care?
answered
Jan 20
in
Psychology
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