أرشيف الوسم : pressure

adsorption isotherm An equation that describes how the amount of a substance adsorbed onto a surface de­pends on its pressure (if a gas) or its concentration (if in a solution), at a constant temperature. Several ad­sorption isotherms are used in sur­face chemistry including the BET isotherm and the Langmuir ad­sorption isotherm. The different isotherms correspond to different as­sumptions about the …

Le-Chatelier principle: if an equilibrium system is subjected to a change, reaction will occur in such a way as to counter act the imposed change. Example. Manufacture of Ammonia:  N3 (g) + H2(g) → 2NH3(g) ; ΔH = -93.6kJ. (i) Effect of pressure: The increases in pressure causes the-equilibrium to shift from left to right. Therefore forward reaction is favored. …