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The First Law of Thermodynamics states that the change in internal energy of an isolated system is 0. So to answer your question, if a system had, let's say +5kJ, after any amount of time, it will still have +5kJ.
how we measure if a system is open, closed, or isolated is if it is able to transfer heat or work with the surroundings which is also how we measure internal energy. In the case of an isolated system it is not able to transfer either so w and q are both 0 which makes deltaU = 0
rkang00 wrote:If a system is isolated with + amount of energy, will it there be no change even after time passes?
There will be no change regardless of the amount of time passed. However, this is not the case for open and closed systems.
The internal energy of the system would not change as an isolated system doesn't exchange energy or matter with it's surroundings and based off the conservation of energy theory, if energy isn't used or exchanged, the energy will stay constant.
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