Elements that are in the same ________ have a tendency to have very similar chemical properties due to periodic trends.
A. group
B. period
C. row
D. textbook
E. compound
Answer: A
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The main component of bleach is sodium hypochlorite, NaOCl, which consists of sodium ions, Na?, and hypochlorite ions, -OCl. What products are formed when this compound is reacted with the hydrochloric acid, HCl, of toilet bowl cleaner?
A. The products are NaCl, O2, and HClO2. B. The products are NaCl and HOCl. C. The products are NaOH, H2O, and Cl2. D. The products are NaOH, O2, and Cl2.
The highest rates of HIV/AIDS in this region are found where?
A. Ethiopia and Somalia B. Mali and Niger C. South Africa, Botswana and Zimbabwe D. Madagascar
The concentration of atmospheric lead increased substantially during the 1990s
Indicate whether the statement is true or false
"Black smokers" are associated with ________
A) mineral-rich waters B) hot water C) oceanic ridges D) all of these