Asquare tank, 3 m on a side, is filled with water to a depth of 2 m. a vertical slot 6 mm wide from the top to the bottom allows the water to drain out. determine the height h as a function of time and the time necessary for one half of the water to drain out.

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).

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i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a