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the electrons in the filled, inner energy levels of an atom.
reactant molecules are in contact with the solid catalyst.
a process that releases energy from the system. This decreases the internal energy of the system...
the average mass of all the different isotopes of an element.
the phase of matter in which the particles have enough free space to move about, but still...
the tail gas is the mixture of gases left over and discarded at the end of the industrial...