Which of the following pairs of substances can be broken down chemically?
a. ammonia and iron
b. helium and argon
c. methane and water
d. potassium and lithium
e. water and carbon

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).