The anion in the common ionic substance NaHCO3 is
a. CO32-.
b. H+.
c. Na+.
d. HCO3-.
d
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In a metal that is not a superconductor, as the temperature increases which of the following is true?
(a) Free electrons are scattered more frequently by structural defects. (b) Free electrons are scattered more frequently thermal vibrations. (c) Free-electron drift velocity is increased because of scattering by vibrating atoms. (d) Free-electron drift velocity is a constant.
Normal atmospheric pressure is
a. 14.7 psi b. 1 N/m2 c. zero d. 760 mm of mercury e. 101,000 pascals f. none of the above
The images produced by _______________ reveal streamers in the corona that follow magnetic lines of force in the Sun's magnetic field
Fill in the blank(s) with correct word
What is a possible reason why Venus does not have plate tectonics?
A) it is too small B) its crust is too dry and stiff to break into plates C) it has no partially molten iron core D) Both A and B