Marble is made from limestone under the influence of heat and pressure. The chemical formula for limestone or marble chips is CaCO3. When you added the chips to the acid solutions, they effervesced (bubble or foam). What is the gas that is produced?
What is the chemical formula of the gas?
How could you test rocks for the presence of limestone?
Write a balanced symbol model for the reaction of limestone with hydrochloric acid.

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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).