Describe the observations that might be seen when a metal reacts with an acid?

Acid is known to be a very strong type of liquid because of it destructive and can wipe almost wipe everything. When it reacts with specific objects, gas is produced. When a metal is poured with acids, it reacts. Salt and hydrogen gas will be produced. Putting an ignited splint in the produced gas when an acid reacts with metal, it fired with a creaky sound, because of the hydrogen produced.