What scientist discovered more elements than any other person?
a. Lavoisier
b. Boyle
c. Berzelius
d. Davy
d
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Molecular Speeds: The molecular weight of nitrogen, N2, is 28 g/mol. What is the rms speed of nitrogen molecules in a cooler at 8.0°C? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol.
A. 450 m/s B. 500 m/s C. 550 m/s D. 600 m/s E. 650 m/s
What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles equidistant from P.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
Cubic zirconia stabilized with CaO is used as an oxygen sensor material because of the high electrical conductivity resulting from the fast diffusion of oxygen ions.
Consider the displacement vectors shown below.
a) Which vector (if any) is equal to 
?
(b) Which is not equal to but has the same magnitude?
(c) Which is equal to 
?
(d) Which is equal to 
?