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Answers by Tesha44V4191
0
votes
29
views
How do the size and shape of quantum dots affect their photochemical properties?
answered
1 day
ago
in
PhotoChemistry
0
votes
18
views
How does an increase in pressure affect the rate of the reaction between hydrogen gas and iodine vapor, given the chemical equation H2(g) + I2(g) ⇌ 2HI(g)?
answered
3 days
ago
in
Chemical kinetics
0
votes
17
views
What is the optimal ratio of diisocyanate and polyol required for the synthesis of polyurethane with desired mechanical and thermal properties?
answered
4 days
ago
in
Chemical synthesis
0
votes
22
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
5 days
ago
in
Materials Chemistry
0
votes
17
views
What is the major product formed when toluene reacts with Br2 in the presence of FeBr3 catalyst? Explain the reaction mechanism involved.
answered
5 days
ago
in
Organic Chemistry
0
votes
25
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What is the enthalpy of vaporization of water at 373K? Given the heat of formation of liquid water is -285.8 kJ/mol and the heat of formation of water vapor is -241.8 kJ/mol. The vapor pressure of water at the boiling point (373K) is 101.325 kPa.
answered
6 days
ago
in
ThermoChemistry
0
votes
18
views
What is the effect of increasing the concentration of NaCl in a solution on the solubility of a sparingly soluble salt, such as AgCl? Show the calculations and explain the reasoning behind your answer.
answered
6 days
ago
in
Chemical equilibrium
0
votes
35
views
What is the bond length between two oxygen atoms in a molecule of O2, given that the equilibrium bond distance of oxygen is 121 pm?
answered
Feb 18
in
Chemical bonding
0
votes
28
views
How does temperature affect the multilayer adsorption of gases onto solid surfaces predicted by the BET theory? Provide experimental evidence to support your answer.
answered
Feb 17
in
Surface Chemistry
0
votes
27
views
What conditions are needed for the catalytic polymerization of ethylene monomers in order to obtain high molecular weight polyethylene?
answered
Feb 13
in
Chemical synthesis
0
votes
41
views
How can the compatibility of polymer blends be improved to enhance their properties and performance?
answered
Feb 6
in
Polymer Chemistry
0
votes
10
views
How can the chemical engineers design and optimize a system to produce the flavor compounds of a specific fruit, while considering factors such as raw material selection, reaction conditions, separation techniques, and cost-effectiveness?
answered
Feb 6
in
Chemical engineering
0
votes
96
views
Identify the type of isomerism (structural or stereoisomerism) present in the following molecules: 1. cis-2-butene and trans-2-butene 2. Butan-2-ol and 2-methylpropan-2-ol 3. 2-chloropropane and 1-chloropropane 4. Methoxyethane and ethanol
answered
Jan 30
in
Chemical bonding
0
votes
74
views
What is the concentration of chloride ions in a sample of seawater using potentiometry?
answered
Jan 30
in
Analytical Chemistry
0
votes
86
views
How much lead is present in a water sample collected from a local river using atomic absorption spectroscopy?
answered
Jan 30
in
Analytical Chemistry
0
votes
51
views
Calculate the heat of crystallization of 5 moles of calcium chloride, given that the enthalpy change of hydration of calcium ions is –1622 kJ/mol and that of chloride ions is –364 kJ/mol.
answered
Jan 23
in
ThermoChemistry
0
votes
58
views
Calculate the bond dissociation energy (in kJ/mol) of the C-H bond in methane (CH4) using the following given data:- Enthalpy of formation of methane (CH4) = -74.8 kJ/mol- Enthalpy of combustion of methane (CH4) = -890.4 kJ/mol- Enthalpy change for the breaking of all four C-H bonds in methane = 1665 kJ/mol.
answered
Jan 23
in
ThermoChemistry
0
votes
35
views
A student attempted to produce 25 grams of product by performing a chemical reaction, but only obtained 18 grams. What was the percent yield for this reaction?
answered
Jan 22
in
Chemical reactions
0
votes
29
views
What is the key finding of the Milgram obedience experiment?
answered
Jan 20
in
Psychology
0
votes
54
views
When is operant conditioning used to modify behaviour?
answered
Jan 20
in
Psychology
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