Which of the following is the geometry at the carbon atom of an aldehyde or ketone?
A) linear
B) tetrahedral
C) trigonal planar
D) square planar
C
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In a battery, if the following oxidation-reduction reactions takes place normally:Mn2O3 + ZnO ? 2 MnO2 + Zn What reaction would be taking place if you were charging the battery?
A. ZnO ? Zn B. 2 MnO2 + Zn ? Mn2O3 + ZnO C. Mn2O3 ? MnO2 D. all of the above E. none of the above
What is the single greatest advancement in tools used for observing tropical cyclones?
A) radar B) aircraft reconnaissance C) data buoys D) meteorological satellites
Which region has the largest percentage of its population living in urban regions?
A) North America B) Latin America C) Europe D) Asia E) Africa
How much pollution in Mexico City is generated by vehicles?
A) 35% B) 50% C) 60% D) 75% E) 90%