A gas, often hydrogen. For example.
H2SO4 + Mg > MgSO4 + H2
Sulphuric Acid + Magnesium > Magnesium Sulphate + Hydrogen
The Hydrogen is the excess gas
Most metals react with acids to give off hydrogen. Only very nonreactive metals, like gold and platinum do not react with metals. An example would be: Calcium + Hydrochloric Acid = Calcium chloride + Hydrogen gas (Ca +2 HCl = CaCl2 + H2)
A gas called hydrogen is given off when most metals react with aqueous hydrochloric acid. The ease with which this happens varies: All alkali metals reacts extemely quickly and, with the possible exception of lithium, dangerously. The alkaline earth metals, except beryllium and magnesium, are similar. Most other metals dissolve more slowly and may require heating to evolve the hydrogen gas, and some metals such as copper, gold, and platinum do not react at all.
React a small ammount with water and compare the heat given off with other alkali metals ofc if it does not react then it would be Cs
hydrogen eg:Na+HCl------>NaCl+H2
it reacts then gives off gases and releases a flame.
Calculate the density. An easy way to do it--so long as you're dealing with metals that don't react violently when wetted--is to weigh the sample then drop it in a graduated cylinder with some water in it. The weighing gives you mass, the graduated cylinder gives volume, mass divided by volume gives density.
The rate at which metals react does not necessarily determine the amount of hydrogen gas given off. The amount of hydrogen gas produced in a reaction is determined by the stoichiometry of the chemical reaction between the metal and the acid.
Metals such as zinc, iron, and aluminium react with concentrated sulfuric acid to give off hydrogen gas, which is flammable and potentially explosive. The reaction with these metals also produces metal sulfates and acidifies the solution, giving it an acidic character.
Water can give off hydrogen when electrolyzed using an electric current. Certain metals, like magnesium and aluminum, can also react with acids to produce hydrogen gas. Additionally, some bacteria and algae produce hydrogen gas as a byproduct of their metabolic processes.
Zinc does react when heated. It sparks, then turns to a liquid. The reaction takes place because the zinc combines with the o2 and creates zinc oxide.
Almost any acid will react with magnesium to produce hydrogen.
Li (Lithium), Na (Sodium), K (potassium). They are highly reactive - they react violently with water and also react with oxygen.