Recent questions in Physical Chemistry

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1 answer 91 views

What is the molecular structure of caffeine and how can its structure be determined using spectroscopy and vibrational analysis?

asked Jan 31 in Physical Chemistry by OliverOtis4 (2.3k points)

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1 answer 82 views

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 Jan 31 in Physical Chemistry by Mose2866156 (1.6k points)

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1 answer 37 views

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 Jan 31 in Physical Chemistry by KristeenBras (2.0k points)

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1 answer 132 views

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 Jan 31 in Physical Chemistry by AleidaSeifer (1.7k points)

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1 answer 82 views

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 Jan 31 in Physical Chemistry by NicholasTwm2 (2.0k points)

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1 answer 77 views

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 Jan 31 in Physical Chemistry by NilaBody107 (1.7k points)

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1 answer 144 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 Jan 31 in Physical Chemistry by LethaWinfrey (1.7k points)

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1 answer 96 views

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 Jan 31 in Physical Chemistry by NinaDimattia (1.6k points)

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1 answer 84 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 Jan 31 in Physical Chemistry by JanisMontane (1.8k points)

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1 answer 98 views

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 Jan 31 in Physical Chemistry by BrittSalas76 (1.8k points)

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1 answer 100 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 Jan 31 in Physical Chemistry by AngelikaYvu6 (1.9k points)

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1 answer 105 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 Jan 31 in Physical Chemistry by PrincessDial (2.0k points)

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1 answer 74 views

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 Jan 31 in Physical Chemistry by MackMurry86 (2.2k points)

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1 answer 107 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 Jan 31 in Physical Chemistry by SherrylP401 (2.4k points)

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1 answer 37 views

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

asked Jan 31 in Physical Chemistry by MillaFredric (1.5k points)

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1 answer 104 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 Jan 31 in Physical Chemistry by KreogMoore5 (6.4k points)

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1 answer 125 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 Jan 31 in Physical Chemistry by KelleS495456 (1.9k points)

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1 answer 144 views

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

asked Jan 31 in Physical Chemistry by StefanieBret (2.1k points)

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1 answer 125 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 Jan 31 in Physical Chemistry by OliveMatthae (2.1k points)

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1 answer 102 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 Jan 31 in Physical Chemistry by Dannie89E20 (2.0k points)

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