Fall 2015 Exam 1. e 9. c 17. a) 9.91 x 1024 N2 molecules

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Fall 2015 Exam 1. e 9. c 17. a) 9.91 x 1024 N2 molecules 2. a 10. b b) 25.0 mol 3. e 11. d c) 9.4 atm 4. a 12. d d) n and T are constant before 5. d 13. e and after the valve is connected. 6. b 14. c Thus, as the volume expands 7. b 15. 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)