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Reversible and irreversible systems have many components to them depending on what you're focusing on, but the main take away is that reversible systems do more than irreversible systems. This is where the differences in components and steps come in; for reversible it is important to note that this is happening in an isothermal environment, so the internal energy change is zero and that there are very small changes being made to the system over time. For irreversible, it's important to remember that the change from one volume to the other is not happening in small increments, and therefore the approach to this would be different. Hope that made sense and helped a little!
Just to add on, a reversible reaction is a reaction where the reactants form products that will also react together to give the reactants in reverse. If heat is absorbed in the forward process, the same heat will be released out in the reverse process. Also, if work is done by the system in the forward process, work will be done on the system in the reverse process. Hence the system will restore to the original state. Yet in an irreversible reaction, the forward reaction and the reverse reaction do not undergo the same path.
In a reversible system what's happening is that heat is going into the system at basically the same rate that it's going out (think of it like if a balloon is slowly expanding vs just popping) and in an irreversible system you're going to get less work done and there will be a temperature change due to the work done by the system happening so quickly
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