The equation for the reaction of zinc and hydrochloric acid to yield zinc chloride and hydrogen gas is:

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

Here's a breakdown:

* Zn(s): Zinc in its solid state (s)

* HCl(aq): Hydrochloric acid in its aqueous state (aq)

* ZnCl₂(aq): Zinc chloride in its aqueous state (aq)

* H₂(g): Hydrogen gas in its gaseous state (g)

This reaction is a single displacement reaction where zinc displaces hydrogen from hydrochloric acid. The hydrogen atoms then combine to form hydrogen gas, which is released as bubbles.