CBSC Science

I) Reactivity Series: -            The Arrangement of elements according to their reactivity is called reactivity series. II) Reaction Of Metals with water.          Metal react with water to form metal hydroxide and hydrogen gas is released Metal +water ------->metal hydroxide +hydrogen gas Na (s) + cold H2O (l) ------------>NaOH (aq)+H2(g) K (s) + cold H2O (l) ---------> KOH (aq) + H2 (g) ✓Some Metals react with cold water:  Sodium and Potassium are the metals which reacts with cold water. ✓Some Metals react with hot water:  Calcium and Magnesium are the metals which reacts with hot water. Ca (s) + hot H2O (l) --------> Ca(OH)2 (aq) Mg(s) + hot H20 (l) ----------> Mg(OH)2 (aq) ✓Some metals react with steam:        Metals like Iron, Zinc and Aluminium react with steam ✓when iron reacts with steam :  Fe (s)+steam H2O(l)--------->Fe3O4(s) +H2 (g) ✓Some elements don't reacts:-...