Page 509 - Chemistry eBook
P. 509
ifts to the right, and the (g) decreases.
ifts to the right, and the (g) increases.
balanced? Al3+
+ 3Al3+ + Al3+
+ 3Al3+
49 What is the total number of years that must pass before only 25.00 grams of an original 100.0-gram
sample of C-14 remains unchanged?
Sample Regents Questions
(1) 2865 y (3) 11 460 y (2) 5730 y (4) 17 190 y
50 Which radioisotope is used for diagnosing thyroid disorders?
(1) U-238 (3) I-131 (2) Pb-206 (4) Co-60
Jan 2011 #50
Answer
Choice #3
Explanation: I-131 diagnoses thyroid disorders.
[7] [OVER]
2 2 s
+
(2) A,C,B,D (4) D,B,C,A
UNIT 12: NUCLEAR CHEMISTRY © 508
