If a transformation from solid to liquid occurs such that the solid and liquid are always in equilibrium, than the transformation is _____________.
Fill in the blank(s) with the appropriate word(s).
reversible
Physics & Space Science
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Cathode rays are
A. x-rays.
B. 
-rays.
C. electrons.
D. protons.
E. neutrons.
Physics & Space Science
The addition of Na2O to SiO2 to form soda glass reduces the _____________of SiO2.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
The proton-proton chain needs high temperature because
a. of the ground state energy of the hydrogen atom. b. of the presence of helium atoms. c. the protons must overcome the Coulomb barrier. d. of the need for low density. e. the neutrinos carry more energy away than the reaction produces.
Physics & Space Science
In the above model of an atom, where is the neutron located, assuming a neutron is present?
a. A
b. 1
c. 2
d. 3
Physics & Space Science