1. Fall 2015 Exam 1. e 9. c 17. a) 9.91 x 1024 N2 molecules
2. a b b) 25.0 mol
3. e d c) 9.4 atm
4. a d d) n and T are constant before
5. d e and after the valve is connected.
6. b c Thus, as the volume expands
7. b c into two cylinders, the helium
8. a spreads throughout and the
16. a) pressure decreases, showing an Physical change – boiling of water inverse relationship. Chemical change – flame on stovetop; cooking the noodles
b) Tylenol c) 38 cm (letter e)