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0
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27
views
How does the particle size of nanomaterials affect their catalytic properties?
answered
Feb 22
in
Materials Chemistry
0
votes
22
views
What is the most efficient catalyst for the esterification reaction in the process of producing biofuels from vegetable oils?
answered
Feb 21
in
Chemical engineering
0
votes
29
views
How do the mechanical properties of biodegradable polymer coatings affect the performance and lifespan of medical implants such as heart stents under various stress conditions?
answered
Feb 20
in
Materials Chemistry
0
votes
30
views
What is the correlation between the electronic and optical properties of conjugated polymers and their molecular structure, specifically the length of the conjugated backbone?
answered
Feb 20
in
Quantum Chemistry
0
votes
38
views
What is the bond dissociation energy of a hydrogen molecule (H2)? Provide the chemical equation for breaking the bond and explain the meaning of the bond dissociation energy value.
answered
Feb 18
in
Chemical bonding
0
votes
28
views
What is the balanced equation for the synthesis reaction between magnesium and oxygen?
answered
Feb 17
in
Chemical reactions
0
votes
33
views
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?
answered
Feb 14
in
PhotoChemistry
0
votes
50
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What is the effect of incorporating graphene oxide on the mechanical properties of polyethylene-based nanocomposites?
answered
Feb 13
in
Polymer Chemistry
0
votes
41
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How can the mechanical and thermal properties of polymer-based composites be optimized for specific aerospace applications such as aircraft components or spacecraft structures?
answered
Feb 7
in
Polymer Chemistry
0
votes
40
views
How can a heat exchanger be designed for a specific industrial process involving the heating and cooling of a liquid stream with a flow rate of 500L/min and a specific heat capacity of 4.2 kJ/kg K? The temperature of the hot and cold streams are 120°C and 25°C respectively, and the process requires a heat transfer rate of at least 200 kW. What should be the surface area and overall heat transfer coefficient of the heat exchanger to meet the process requirements?
answered
Feb 4
in
Chemical engineering
0
votes
66
views
Calculate the standard Gibbs free energy change ($\Delta G^{\circ}$) for the following reaction at 298 K:2Fe(s) + 3/2O2(g) → Fe2O3(s) Given: Standard enthalpy of formation of Fe2O3(s) = -822.2 kJ/molStandard enthalpy of formation of Fe(s) = 0 kJ/molStandard entropy change for the reaction = +87.4 J/mol K
answered
Feb 3
in
Chemical thermodynamics
0
votes
80
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Calculate the standard enthalpy change for the reaction: 2 NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2 H2O(l)Given the following data:ΔHf°(NaOH) = -469.14 kJ/molΔHf°(H2SO4) = -814.00 kJ/molΔHf°(Na2SO4) = -1388.40 kJ/molΔHf°(H2O(l)) = -285.83 kJ/mol
answered
Feb 3
in
Chemical thermodynamics
0
votes
79
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How does changing the concentration of the reactants affect the rate of reaction and subsequently the profitability of the reaction?
answered
Feb 3
in
Chemical kinetics
0
votes
103
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What is the structure of a given unknown organic compound using IR spectroscopy?
answered
Jan 31
in
Organic Chemistry
0
votes
96
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How can we design engaging and interactive chemistry lessons to increase student interest and participation in chemistry classes?
answered
Jan 30
in
Chemical education
0
votes
59
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Calculate the enthalpy of formation of So₃(g) using the given thermochemical equations:2SO₂(g) + O₂(g) → 2SO₃(g) ∆H = -197 kJ/mol2SO₂(g) + 2O₂(g) → 2SO₃(g) ∆H = -792 kJ/mol
answered
Jan 23
in
ThermoChemistry
0
votes
69
views
Calculate the cell potential for the following electrochemical reaction at 25°C: Zn(s) + 2AgNO3(aq) → Zn(NO3)2(aq) + 2Ag(s) Given: E°(Ag+/Ag) = +0.80 V E°(Zn2+/Zn) = −0.76 V
answered
Jan 23
in
ElectroChemistry
0
votes
67
views
A student sets up an electrochemical cell with two copper electrodes and a copper(II) sulfate solution. The concentration of the copper(II) sulfate solution is 0.1 M. The student measures the potential difference between the electrodes as 0.54 V. Calculate the resistance of the cell in ohms.
answered
Jan 22
in
ElectroChemistry
0
votes
126
views
What is the systematic name of a cycloalkane with 10 carbon atoms?
answered
Jan 21
in
Organic Chemistry
0
votes
49
views
When was the Thematic Apperception Test TAT developed?
answered
Jan 20
in
Psychology
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