Multiple Choice
The concentration of chloride in the human body is approximately 19 mg/g of body mass. What is this concentration in ppb (parts per billion) ?
A) 1.9 102 ppb
B) 1.9 107 ppb
C) 1.9 104 ppb
D) 1,900 ppb
E) 190 ppb
Correct Answer:

Verified
Correct Answer:
Verified
Q19: The concentration of sodium in the human
Q20: The Mg<sup>2</sup><font face="symbol"><sup></sup></font> ion plays a significant
Q21: Chromium is an ultratrace metal in the
Q22: Hearing aid batteries utilize a zinc/air electrochemical
Q23: Chromium is an ultratrace metal in the
Q25: Iodine's role is very specific. It is
Q26: Barium is a nonessential element in the
Q27: Adding fluoride ions to toothpaste and drinking
Q28: Plants convert nitrogen into ammonia. This biological
Q29: Thallium-201 is used in cardiac imaging. It