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Chemical systems undergo three main processes that change the energy of the system.

Which of the following is NOT one of the three main processes of a chemical system?


Direct heating or cooling of a chemical system based on changes in the surroundings.


A change in composition where the system gains from or loses energy to the surroundings.


A physical reaction that results in a slight increase or decrease of energy of a system.


A chemical reaction that results in an increase or decrease of energy of the system.

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