Reactivity of Metals with water or acid and salt

             Reactivity of Metals

All the metals do not react with the same rate. Some react very fast, some react moderately. Whereas others react very slowly e.g., sodium,potassium react with oxygen at room temperature vigorously to form oxide. They can catch fire in presence of moist air. These metals are kept in kerosene oil pr benzene so as to protect them from formation of oxide and hydroxide in open air. At room temperature, metals like Al,Zn,Cu,Mg,Sn,Pb form oxide layer on their surface and become dull. this oxide layer makes aluminum passive and does not allow it to react further with water or oxide and even concentration. HNO₃ . Copper is less reactive and forms black colored oxide and gives green colored flame with blue tip in burner. Magnesium burn with dazzling light forming Mg O. Silver, gold and platinum do not react with oxygen. Mercury forums red colored oxide,  Hg O.

Reaction of metal(iron)

            Reactivity Series of Metals

The series of metals in decreasing order of reactivity is called reactivity or activity series of metals. The metals at the top are most reactive whereas metals. The metals at the bottom are less reactive. the following is activity series of metals. The metals above hydrogen are more reactive than hydrogen. They can displace hydrogen from dilute acids and water. Metals below hydrogen are less reactive than hydrogen and cannot displace hydrogen from dilute acids and water.

         Reaction of metals with water

Some metals like Na,k,Ca react with cold water vigorously to forum hydroxide and liberate hydrogen gas. Some metals like Mg, Zn , Al react with hot water to forum oxides and hydroxides and hydrogen gas. Some metals like Fe reacts with steam to form Fe₃O_{4 and H2 (g) .Some metals like Cu,Ag,Au,Hg,Pb and Pt do not react with water at all because they are less reactive than hydrogen. Let us perform the following experiment.}

             _{Reaction of Metals with Acids}

_{Metals reacts with dilute acids to form salt and hydrogen gas. The metal replaces hydrogen of the acid to form salt . Let us perform experiment t show the reaction of metals with acids.} 

_{Reaction of metals with solution of metal salts}

_{More reactive metal can displace less reactive metal from their salt solution. These reaction are called displacement reaction. Let us carry out these reaction experimentally}