Chem 111 Exam IB S07 Dr. Macintosh Name (please print):
SHOW ALL WORK INCLUDING UNIT CANCELLATIONS. USE PROPER NUMBER OF
SIG FIGS. READ THE QUESTIONS CAREFULLY AND ANSWER THEM COMPLETELY.
1) (10) Complete the following table:
symbol name protons neutrons electrons
35Cl
11 12 10
Strontium-90
2) (6) Describe how the terms molecule and compound are different.
3) (6) Classy each of the following as a physical or chemical change?
(a) A piece of aluminum metal develops a white coating over time. _____________
(b) Sodium chloride is electrolyzed to produce sodium metal and chlorine gas. __________
(c) A purple vapor appears in a vial containing iodine. ___________
4) (6) Fill in the (an) element symbol that corresponds to each of the following:
(a) 4th period halogen __________
(b) 3rd period alkaline earth ____________
(c) a nonmetal in the 3rd period ______________
