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Students are explaining entropy to their classmates.
Which of the following are the most accurate explanations?
Select TWO answers.
Entropy is a state variable that always decreases in a closed system as the order of the system decreases.
Entropy can be explained as "time's arrow" since a more disordered system must come later in time than the more ordered system.
Entropy is derived from the First Law of Thermodynamics and is the difference between the heat added to the system and work done by the system.
Entropy can be considered as the amount of energy unavailable to do work.