The rate of change in a system depends upon the _____________enthalpy.
Fill in the blank(s) with the appropriate word(s).
activation
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The rest mass of a photon is zero kg
Indicate whether the statement is true or false
Which of the following does not increase the strength of a polymer?
(a) Orienting molecules (b) High molecular weight (c) Cross-links (d) Plasticizers
An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
what is its new component of velocity after going through the deflection plates?
a. 
b. 
c. 
d. 
e. 
If the Moon is too far from Earth during a solar eclipse, the _____ does not reach Earth's surface
a. umbra b. ecliptic c. prominence d. penumbra e. solar disk