ANSWERS TO END-OF-CHAPTER QUESTIONS CHAPTER 1: Portable Electronics: The Periodic Table in the Palm of Your Hand Emphasizing Essentials 1. Answer: a. Compound (2 molecules of one compound made up of two different elements). b. Mixture (2 atoms of one element plus 2 atoms of another). c. Mixture (3 different substances, two elements and one compound). d. Element (4 atoms of the same element). 2. Answer: a. element (4 molecules of one diatomic element) b. Compound (2 molecules of one compound made up of two different elements). c. Mixture (2 atoms of one element plus 2 atoms of another). d. Compound (4 molecules of one compound made up of two different elements). 3. Answer: Exact answer will vary depending on viewing size of text. An approximate measurement for the period could be 0.25 mm. Converting this to nanometers: - - or 250,000 nm. 4. Answer: Converting 10.0 nanometers to millimeters: 5. Answer: a. 1.5  103 m b. 9.58  10–11 m