Suppose a new element named questinium has two isotopes. These isotopes are Qu-297 (40.30%, 296.78 amu) and Qu-301 (59.70%, 300.88 amu). What is the atomic weight of questinium, reported to the correct number of significant digits?
A) 299 amu
B) 299.0 amu
C) 299.2 amu
D) 299.23 amu
C
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DDT was originally intended to kill ________
A) corn insects B) birds C) mosquitoes D) plants E) aphids
What is the largest climate modifier in the southern hemisphere?
A) the amount of temperature gradient between the south pole and the equator B) the lack of deserts and dry areas in the southern hemisphere C) the fact that a very large portion of the southern hemisphere's surface area is composed of water D) The jet streams are not as strong and more zonal in the southern hemisphere.
Minerals such as quartz are transformed into ________, which results from the atomic structure being transformed by the high-pressure impact of the meteorite.
A. franklinite B. stibnite C. stishovite D. bornite
Because there is still disagreement about the best methods to use, no high-level radioactive wastes have been consigned to permanent disposal sites, anywhere in the world.
Answer the following statement true (T) or false (F)