what happens when metals react with acids

When metals react with acids, they form a salt and hydrogen gas. The general word equation for the reaction between an acid and a metal is: acid + metal → salt + hydrogen gas. The type of salt that forms will depend on the specific metal and acid used in the reaction. The reaction is highly exothermic, releasing heat. The hydrogen gas produced can be detected by holding a lit splint in the gas, which will burn with a squeaky pop due to the hydrogen created. The reactivity of metals with acids decreases in the order magnesium, aluminum, and zinc. It is important to note that undiluted acids are very dangerous, and concentrated acid reactions can cause explosions and lead to injury.