Question: (a) Describe the difference between adsorption by physisorption and adsorption by chemisorption. (b) For the Langmuir isotherm the change in surface coverage, , with time

(a) Describe the difference between adsorption by physisorption and adsorption by

(a) Describe the difference between adsorption by physisorption and adsorption by chemisorption. (b) For the Langmuir isotherm the change in surface coverage, , with time is given by the following expression: dtd=kapN(1)kdN=0 Define the terms in the expression and with reference to the relevant assumptions made in the Langmuir model, explain why this is a reasonable approximation of d/dt. (c) Explain why adsorption is sometimes considered an activated process and why is desorption always an activated process

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