The total energy of an open system be changed if:
- There is an exchange between matter and energy
According to the First Law of Thermodynamics, energy cannot be created or destroyed, it can only change form.
An open system is a system that has an interaction with its environment where matter or energy can be added or removed from the environment.
As a result of this, the total energy of an open system can be changed if there is an exchange between matter and energy and they remain constant.
Therefore, the correct answer is an exchange has to take place for the total energy in an open system to be changed.
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