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Physisorption Chemisorption Forces of attraction are vander Waals' forces Forces of attraction are chemical bond forces Low enthalpy of adsorption (20 - 40 k.J/mole) High enthapy of adsorption (200 - 400 k.J/mole) This process is observed under conditions of low temperature This process takes place at high temperatures It is not specific It is highly specific Multi-molecular layers may be formed Generally, monomolecular layer is formed This process is reversible This process is irreversible
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ViviPhysisorption involves weak van der Waals forces between the adsorbate and adsorbent, while non-activated chemisorption involves stronger chemical bonds forming between the two. Physisorption typically occurs at lower temperatures and can be easily reversed, while non-activated chemisorption requires higher temperatures and is more difficult to reverse.
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Why Physisorption is multilayered and chemisorption is monolayered?
physisorption involves van der wall attractive forces between adsorbent and adsorbed , This may result on the accumulation of many layers of the molecules on the surface. Chemosorption involves formation of chemical bonds between adsorbent and adsorbed molecule. Adsorbent have some functional groups or atoms on its surface with unsatisfied valences, once these valences are satisfied they don't undergo bond formation with more adsorbed molecules and only single layer is formed.
Why physisorption decreases with increase in temperature?
Physisorption involves weak van der Waals forces between gas molecules and a solid surface. As temperature increases, gas molecules gain more kinetic energy, making it harder for them to be retained on the surface through weak interactions. This leads to a decrease in physisorption at higher temperatures.
What is the difference between an activated complex and an intermediate?
An activated complex refers to the highest energy state along the reaction pathway, representing the transition state between reactants and products. An intermediate is a stable species formed during the reaction but is not the final product. It can be a product of one step and a reactant in the next step of the reaction.
What is the difference between activated carbon and charcoal?
Activated carbon is a form of charcoal that has been specially treated to have a larger surface area and more porous structure, making it more effective at adsorbing impurities and toxins. Charcoal, on the other hand, is a more general term for any carbon-rich material that has been charred through heating in the absence of oxygen.
What are the differences between activated carbon and charcoal, and how do they impact their effectiveness in various applications?
Activated carbon is a form of charcoal that has been specially treated to have a larger surface area and more porous structure. This makes activated carbon more effective at adsorbing impurities and pollutants compared to regular charcoal. In various applications, activated carbon is often used for water and air purification, as well as in medical treatments and industrial processes. Regular charcoal, on the other hand, is commonly used for cooking and grilling due to its ability to absorb odors and moisture. The key difference between the two lies in their surface area and porosity, which impacts their effectiveness in different applications.
