Answer: The products becoming more ordered than the reactants. Explanation: The more orderly a system is, the less entropy it has.

How does entropy affect a reaction?

If one molecule splits apart in the reaction, entropy generally increases. ... Entropy generally increases when a reaction produces more molecules than it started with. Entropy generally decreases when a reaction produces fewer molecules than it started with.

How do you know if a reaction will decrease entropy?

Therefore, if the reaction involves only gases, the entropy is related to the total number of moles on either side of the reaction. A decrease in the number of moles on the product side means lower entropy. An increase in the number of moles on the product side means higher entropy.