Iron fillings are added to water, and sink to the bottom. is this a mixture or a solution ?

It is a Mixture

A mixture is a combination of different things that are not chemically bonded.

A solution is a special type of homogeneous mixture composed of two or more substances. A solute is a substance dissolved in another substance, known as a solvent and when this happens a solution is formed

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answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).