If one could observe the individual atoms making up a piece of matter and note that during a process of change their motion somehow became more orderly, than one may assume which of the following in regard to the system? a. increase in entropy b. decrease in entropy c. gains in thermal energy d. positive work done on I know the answer is b. decreases in entropy, but my question is why? This may seem like a silly question, but I just wanted to make sure I understood what's going on here. If there is a decrease in entropy, that would mean that temperature is going up, correct? I'm also not quite sure on what they mean by "orderly," the atoms would be speeding up if this was the case, but I don't see what that has to do with being "orderly." Thanks for any help!