3. The breaking down of rocks into smaller pieces by physical means, without changing the chemical composition is
A. Chemical weathering
B. Mechanical weathering
C. Igneous Intrusion
D. Acid rain weathering

A. Chemical weathering

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).