Recent questions in Surface Chemistry

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1 answer 29 views

How does changing the length of the hydrocarbon chain in a surfactant affect its ability to reduce surface tension?

asked 2 days ago in Surface Chemistry by LidaOsulliva (490 points)

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1 answer 44 views

How do changes in surface properties of food contact materials, such as metals or polymers, affect the adhesion and removal of microorganisms during food and beverage processing?

asked 4 days ago in Surface Chemistry by Daniella42I3 (370 points)

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1 answer 60 views

How do changes in pH affect the surface properties of biomembranes?

asked 4 days ago in Surface Chemistry by ShaunRea9759 (310 points)

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1 answer 50 views

How do changes in pH affect the surface properties of biomembranes and how can this knowledge be applied in drug delivery systems?

asked 4 days ago in Surface Chemistry by FawnContrera (430 points)

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1 answer 33 views

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

asked 4 days ago in Surface Chemistry by EarleneSumme (530 points)

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1 answer 48 views

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

asked 5 days ago in Surface Chemistry by Bessie598680 (590 points)

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1 answer 6 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 5 days ago in Surface Chemistry by GonzaloBenne (370 points)

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1 answer 75 views

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

asked 5 days ago in Surface Chemistry by CleoStroud1 (310 points)

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1 answer 54 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 5 days ago in Surface Chemistry by StephenFrawl (310 points)

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1 answer 44 views

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

asked 5 days ago in Surface Chemistry by ChelseaMedra (390 points)

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1 answer 69 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 5 days ago in Surface Chemistry by TahliaHenley (570 points)

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1 answer 40 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 ValCurrier53 (390 points)

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1 answer 8 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 RichGillilan (650 points)

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1 answer 6 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 JanineGeach (650 points)

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1 answer 58 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 EnriquetaWhe (710 points)

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1 answer 44 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 MoniqueLogue (330 points)

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1 answer 40 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 LesleyStyers (670 points)

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1 answer 48 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 TomHatley066 (770 points)

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1 answer 35 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 PerryTolmie (390 points)

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1 answer 44 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 Leo425114985 (250 points)

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