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Physics

Answered

A reaction occurs in which aluminum combines with bromine to form aluminum bromide. Is this
a chemical reaction or a nuclear reaction, and how do you know?
This is a chemical reaction, because some of the mass was not conserved.
This is a nuclear reaction, because the atoms' nuclei changed.
This is a chemical reaction, because only electrons were rearranged.
This is a nuclear reaction, because mass was conserved.

Answer :

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