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Hi! In Lavelle's Friday lecture, he mentioned that a change in pressure due to adding an inert gas would not cause a change in the reaction because the volume does not change. Thus, I believe that a change in the reaction only occurs when the pressure and volume are changing.
Yes, this is due to the fact that compression, decreasing the volume to increase pressure, causes a change in the concentration of reactants and products since concentration is equal to number of moles per liter(VOLUME), but if the volume does not change and you, say, insert an inert gas to change the pressure, nothing will happen since the concentrations of reactants and products are the same.
Yes, that is correct. Changing the volume has an affect on the concentration of the reactants and products, which ultimately will change the value of Q and cause the reaction to either shift to the left or right depending on the relation between Q and K.
As others have expressed above, changing the pressure by changing the volume will cause the reaction to change because changing the volume changes the concentration of the products and reactants. On the other hand, changing the volume by adding an inert gas will not cause the reaction to change because the addition of an inert gas has no effect on the concentrations of the products and reactants.
As long as the gas isn't inert, then changing the pressure will change the reaction due to a change in volume. The change in volume changes the concentration of the products and reactants, which thus causes a reaction change.
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