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* Note the marked changes reversible. And show that the balance
.Reversible change of the system. Not necessarily a reaction system with only May be dissolved in a solvent or changing the state of matter, so the change of a substance can be divided into three reversible.

* Please note the change agent mark reversible and holds that balance
.Changes in reversible systems There is no need to be a system that has only a reaction may be dissolved into aqueous solution or change the status of the substance. The change of the substance that may be reversible, divided into 3.

* Note: Check box instead of the changes that can be diverted to return and show that balance
The change of the system that can be diverted back. Don't need to be a system that has the potential to be a reaction may be only a solvent is aqueous or a change of status, so the change of the substance of reversing can be divided into 3.