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RULES FOR DETERMINING RELATIVE ENTROPY CHANGE FOR A PROCESS When determining the relative entropy change for a process, the following rules are listed from GREATEST to LEAST effect. These rules are generally applied in order from TOP to BOTTOM of the list. If Rule (il applies, there is no need to consider Rule (ii), and so forth. Keep in mind: if something can be classified using multiple rules, use the rule higher up on the list to determine which factor is most likely to have the greatest impact on entropy. Note: There are special exceptions to these rules, but these exceptions are not covered in this activity. Rule i) Physical State: Determine which side of the reaction has physical states of greater entropy. Physical states in order of increasing entropy: s = 1