This reaction is a classic example of a single displacement reaction where a more reactive metal displaces hydrogen from the acid.

Here's a simplified representation of the reaction:

Metal + Acid → Salt + Hydrogen gas

For example:

* Zinc + Hydrochloric acid → Zinc chloride + Hydrogen gas

Zn + 2HCl → ZnCl₂ + H₂

Note: Not all metals react with acids. The reactivity of a metal is determined by its position in the reactivity series. Metals above hydrogen in the reactivity series can displace hydrogen from acids.