Recent questions in Surface Chemistry

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1 answer 143 views

How does changes in pH affect the stability and coagulation of a colloidal solution?

asked Jan 31 in Surface Chemistry by KelleS495456 (1.9k points)

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1 answer 129 views

How do specific biomolecules interact with the surface of biomembranes and what specific surface properties of the biomembrane influence these interactions?

asked Jan 31 in Surface Chemistry by NoeX25113136 (1.9k points)

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1 answer 26 views

What is the critical micelle concentration (CMC) of surfactant X in an aqueous solution at 25°C? Provide a detailed explanation of the method used to determine the CMC of surfactants and discuss the significance of CMC in surface chemistry.

asked Jan 31 in Surface Chemistry by CharleyPrior (1.8k points)

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1 answer 149 views

How do amphipathic molecules contribute to the surface properties of biomembranes?

asked Jan 31 in Surface Chemistry by SylviaPettey (2.4k points)

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1 answer 116 views

How does the adsorption of reactant molecules onto a heterogeneous catalyst surface promote chemical reactions, and what are the different mechanisms involved in heterogeneous catalysis?

asked Jan 31 in Surface Chemistry by GlenCaringto (2.1k points)

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1 answer 119 views

How do different parameters such as pH, temperature, and concentration affect the adsorption efficiency of activated carbon towards a specific pollutant?

asked Jan 30 in Surface Chemistry by 540252730007 (1.9k points)

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1 answer 174 views

How does the surface area, pore size, and pH of activated carbon affect its ability to adsorb pollutants such as volatile organic compounds (VOCs) from air or water?

asked Jan 30 in Surface Chemistry by RichieRedric (1.9k points)

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1 answer 88 views

Calculate the area per molecule occupied by a monolayer of n-octadecane molecules adsorbed at the air-water interface assuming a surface pressure of 20 mN/m. The molecular weight of n-octadecane is 284.54 g/mol and its molecular area in the liquid phase is 0.219 nm². Use the Langmuir adsorption isotherm equation to solve the problem.

asked Jan 23 in Surface Chemistry by ElmoMcColl39 (1.7k points)

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1 answer 95 views

A student wants to determine the specific surface area of a solid sample using gas adsorption. The sample has a mass of 1 gram and the adsorption isotherm follows the BET model. The student measures the volume of nitrogen gas adsorbed at different pressures and obtains the following data:Pressure (torr) | Volume of nitrogen (cm3)---------------|----------------------- 50 | 24.51 100 | 39.22 200 | 67.38 300 | 90.86 400 | 104.29What is the specific surface area of the sample based on the BET model?

asked Jan 22 in Surface Chemistry by EdwardCecili (1.9k points)

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1 answer 109 views

A droplet of water weighing 0.2 grams is placed on the surface of a perfectly clean glass plate. The diameter of the droplet is measured to be 5 mm. Calculate the surface tension of water in dynes/cm.

asked Jan 22 in Surface Chemistry by MellisaOlivo (1.9k points)

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1 answer 132 views

A chemistry student wants to study the adsorption of nitrogen gas on a copper surface at 298 K. The student knows that the Langmuir adsorption isotherm can be used to describe this system. They want to determine the maximum amount of nitrogen gas that can be adsorbed on the copper surface and the adsorption energy of nitrogen to the copper surface. Can you help the student to calculate these values using the Langmuir adsorption isotherm equation?

asked Jan 22 in Surface Chemistry by ColumbusU230 (2.4k points)

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1 answer 85 views

A chemistry student wants to study the adsorption behavior of a gas on a solid surface. The Langmuir adsorption isotherm experiment is conducted at temperature T. After analyzing the data, the student finds that the maximum adsorption capacity (at saturation) is q moles of the gas per unit area of the solid surface. The student also determines the value of the Langmuir constant K, which is proportional to the affinity of the gas for the surface. Now, the student needs to determine the fraction of the surface that is covered by the gas molecules at a certain pressure P below the saturation

asked Jan 22 in Surface Chemistry by KaitlynRodri (2.0k points)

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1 answer 99 views

A chemistry student wants to measure the zeta potential of a colloidal solution. The student has chosen the appropriate instrument, but needs to determine the optimal pH range for the solution in order to obtain accurate and meaningful results. What is the recommended method to determine the optimal pH range for measuring the zeta potential of a colloidal solution, and how can the student ensure accurate and reliable measurements using this method?

asked Jan 22 in Surface Chemistry by Precious09K0 (2.0k points)

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1 answer 117 views

A chemistry student wants to measure the surface tension of a liquid but does not have access to a tensiometer. How can the student measure the surface tension using simple materials found in a chemistry lab?

asked Jan 22 in Surface Chemistry by ZellaSeamon3 (1.6k points)

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1 answer 112 views

A chemistry student wants to investigate the adsorption of a certain gas onto a solid surface. The student conducts an experiment and obtains the following data for different pressures of the gas:| Pressure (p) / atm | Quantity adsorbed (q) / g ||---|---|| 0.1 | 0.12 || 0.2 | 0.21 || 0.3 | 0.29 || 0.4 | 0.36 || 0.5 | 0.41 || 0.6 | 0.49 |Using the Langmuir adsorption isotherm, the student wants to determine the maximum amount of the gas that can be adsorbed onto the surface (q_max) and the rate constant for the adsorption process (k_ads). What are the values of q_max and k_ads for this gas-surface sys

asked Jan 22 in Surface Chemistry by Margene00368 (1.8k points)

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1 answer 108 views

A chemistry student wants to investigate the adsorption behavior of a gas on a solid surface. Using the Langmuir adsorption isotherm, determine the maximum adsorption capacity of the surface and the equilibrium constant, if the surface area of the solid is 10 cm$^2$ and the gas pressure is varied from 0.1 to 1 bar at a constant temperature of 298 K.

asked Jan 22 in Surface Chemistry by TinaKesler6 (1.9k points)

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1 answer 140 views

A chemistry student wants to determine the surface area of a porous material using gas adsorption. The student has access to a BET specific surface area analyzer and pure nitrogen gas. What is the surface area of the porous material if the adsorption isotherm shows a monolayer formation at the partial pressure of nitrogen adsorption around 0.1?

asked Jan 22 in Surface Chemistry by ChloeBodnar (2.0k points)

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1 answer 123 views

A chemistry student wants to determine the surface area of a metal oxide sample using the Langmuir adsorption isotherm. The student collects adsorption data at different pressures and determines the amount of gas adsorbed on the surface. The Langmuir isotherm equation used is y = Kx / (1 + Kx), where y is the fractional surface coverage, x is the pressure of the gas, and K is a constant related to the adsorption energy. The student obtains the following data:Pressure (atm) | Fractional surface coverage-------------|---------------------------

asked Jan 22 in Surface Chemistry by ElmoMcColl39 (1.7k points)

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1 answer 116 views

A chemistry student needs to determine the Langmuir constant and maximum adsorption capacity of a metal oxide nanoparticle using the Langmuir adsorption isotherm equation from experimental data obtained at different concentrations of a given adsorbate in the water. Determine the Langmuir equation parameters and plot the experimental data and the Langmuir model using a graph. Finally, interpret the results in terms of the adsorption behavior of metal oxide nanoparticle towards the selected adsorbate.

asked Jan 22 in Surface Chemistry by JaneW5862561 (1.8k points)

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1 answer 146 views

A chemistry student is studying the Langmuir adsorption isotherm and wants to determine the monolayer coverage of a gas adsorbed on a solid surface. The student measures the amount of gas adsorbed at various pressures and at a constant temperature of 298 K. Using the Langmuir adsorption isotherm equation, what is the monolayer coverage of the gas on the surface at this temperature?

asked Jan 22 in Surface Chemistry by LouiePartrid (1.8k points)

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