Questions, questions, questions. That is all you will find in this chapter. These questions are more chal-lenging than those found at the end of the chapters, and some questions are completely open-ended! I hope you enjoy them. There are 30 questions: 1 to 10 are mainly about gases; 11 to 13 concern liquids; 14 to 27 are mainly about solids; and questions 27 to 30 concern changes between different phases.