Method 1: making a soluable salt. metals
//metal + acid > salt + hydrogen//
(note: sme metals are too reactive e.g potassium, Sodium, Lithium and some are not reactive enough e.g Gold, silver.)
For example: Magnesium + hydrochloric acid > magnesium chloride + hydrogen.
1. add acide to test tube add metal to acid.
satrted: bulbbles with produce finished: bubbles will stop being produce.
Method 2: making a soluable salt. metals