What observations support the assumption that all of the iodine reacted with the zinc explain?

The appearance of white solid zinc iodide shows that a chemical reaction has taken place.

There are certain cues that show that a chemical reaction has occurred. Some of those cues include;

When iodine reacts with zinc, we see the appearance of white solid zinc iodide shows that a chemical reaction has taken place.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.