Recent questions in Physical Chemistry

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What are the effects of branching and crosslinking on the physical properties of polymers? Provide specific examples of how branching and crosslinking affect the glass transition temperature, crystallinity, and mechanical properties of polymers.

asked 4 days ago in Physical Chemistry by RodgerFitzGi (370 points)

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What is the chemical structure of a compound with a chemical formula of C9H10O2 that shows a signal at 2.3 ppm in its proton NMR spectrum and has a singlet signal at 170 ppm in its carbon NMR spectrum?

asked 4 days ago in Physical Chemistry by MarjorieOuth (650 points)

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What is the chemical structure of a compound that exhibits a peak at 3 ppm in a ^1H-NMR spectrum and a peak at 125 ppm in a ^13C-NMR spectrum?

asked 4 days ago in Physical Chemistry by IrwinPie1108 (500 points)

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What is the chemical structure of an unknown compound based on its infrared spectrum, where a peak is observed at 3500 cm^-1 and no peaks are observed between 1600-1800 cm^-1?

asked 4 days ago in Physical Chemistry by BarbraAdamso (230 points)

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What is the temperature at which ice and water are in equilibrium at a pressure of 1 atm? Calculate the amount of heat in joules required to melt 100 g of ice at this temperature assuming no change in pressure. (Hint: use the heat of fusion for water, which is 6.01 kJ/mol).

asked 4 days ago in Physical Chemistry by ZacheryKitam (330 points)

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1 answer 44 views

What happens to the rate of a photochemical reaction as the intensity of light increases? Provide examples of photochemical reactions and their corresponding rates at different light intensities. How can this information be applied in the development of photovoltaic cells?

asked 5 days ago in Physical Chemistry by MitziMacDevi (370 points)

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What is the chemical structure of an unknown organic compound that has been analyzed using magnetic resonance spectroscopy, and what functional groups are present in the compound?

asked 5 days ago in Physical Chemistry by EthelSchenk9 (370 points)

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1 answer 38 views

What is the most stable conformation of 1,2-dichloroethane and how does it affect the molecule's dipole moment? Use computational chemistry and molecular modeling to calculate the energy of different conformations and analyze their dipole moments.

asked 5 days ago in Physical Chemistry by SheenaIverso (590 points)

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What is the molecular structure of a sample under investigation, based on the magnetic resonance spectra recorded at different temperatures and under different magnetic fields?

asked 5 days ago in Physical Chemistry by FaustoRhea01 (410 points)

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1 answer 52 views

What is the rate expression for the following gas phase reaction?2NO2(g) → 2NO(g) + O2(g)The student would need to determine the rate expression using experimental data and the rate law equation.

asked 5 days ago in Physical Chemistry by DianHolliday (450 points)

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1 answer 60 views

What is the effect of catalyst concentration on the rate of a reaction? Take a specific catalytic reaction and investigate how the rate of the reaction changes as the concentration of the catalyst is varied. Perform experiments and analyze the results to determine the relationship between catalyst concentration and reaction rate.

asked 5 days ago in Physical Chemistry by Camille60A10 (550 points)

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What is the chemical structure of a compound that gives a specific peak at 7.2 ppm in a Carbon-13 Nuclear Magnetic Resonance (NMR) spectrum?

asked 5 days ago in Physical Chemistry by ChristenHold (390 points)

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1 answer 53 views

How does the molecular structure of water change as the temperature and pressure vary? Use quantum mechanics to explain the changes in bond lengths and angles.

asked 5 days ago in Physical Chemistry by MarquisTalli (310 points)

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Using computational chemistry and molecular modeling, determine the most stable conformer of cyclohexane and calculate its heat of formation at 298 K.

asked 5 days ago in Physical Chemistry by SheldonW2345 (590 points)

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1 answer 46 views

Here's a question for a chemistry student to solve:What is the effect of changing the concentration of the catalyst on the rate of the catalytic reaction between hydrogen peroxide and potassium iodide?

asked 5 days ago in Physical Chemistry by TomHatley066 (770 points)

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1 answer 54 views

How does an infrared spectrum help in determining the molecular structure of a compound? Provide an example of a compound where the infrared spectrum can be used to analyze the presence of functional groups, and explain how it would be done.

asked 5 days ago in Physical Chemistry by ChristenaPic (550 points)

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1 answer 66 views

What is the crystal structure of aluminum oxide (Al2O3)?

asked 5 days ago in Physical Chemistry by Gilberto30M (540 points)

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1 answer 47 views

How does the adsorption of a gas on a solid surface vary with temperature and pressure? Provide experimental evidence for your explanation by conducting an adsorption study of a gas on a specific solid at different temperatures and pressures.

asked 5 days ago in Physical Chemistry by GeraldineLam (470 points)

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1 answer 51 views

How do the different factors such as temperature, pressure, and nature of the gas affect the adsorption behavior of a gas on a solid surface? Provide experimental data and theoretical explanations to support your answer.

asked 5 days ago in Physical Chemistry by JaimieGuerra (590 points)

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1 answer 43 views

How does adsorption of gas molecules on a solid surface change with temperature and what are the factors that affect the extent of adsorption?

asked 5 days ago in Physical Chemistry by DamarisAew42 (270 points)

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