<s>[INST] ### 1. Describe a situation where the change in entropy is negative.
A positive change in entropy means that a system has become more random and less organized, so a negative change in entropy means that the system has become less random and more organized. One example would be the formation of an ice cube from water. In this process, the molecules slow down and come together in a crystalline structure, resulting in a more organized state and a decrease in entropy.

### 2. Is the entropy of the system always a non-negative quantity?[/INST]