question_answer

  Describe an activity to demonstrate reaction of steam on iron. Or Discuss reactivity of different metals in reactivity series with water.

Answer:

  Aim To show reaction between iron and steam. Material Burner, stand, boiling tube, cork, delivery tube, water, glass tube, glass wool an iron sample. Procedure (i) Set up the apparatus as shown in the figure. (2) (ii) Heat the metal by using burner (iii) When the metal gets hot, heat the glass wool soaked in water. The water present in glass wool forms steam on heating which passes over the hot metal. (iv) The hot metal reacts with steam forming metal oxide and hydrogen gas. (v) Hydrogen gas collects in the glass tube over the water. When a lighted match stick is applied to the gas collected in glass tube, the gas burns with a 'pop' sound, indicating that it is hydrogen.                                                       (2)                                                                                                                         (1) Or (i) Reactive metals react with cold water and reaction results in fire.                                                                                                                      (1) (ii) Less reactive metals also release hydrogen, but nofire occurs.                                                                                                                          (1) (iii) Metals such as magnesium react with hot water.                                                                                                                                             (1) (iv) Less reactive metals like Al, Zn, etc react with steam.                                                                                                                          (1) (v) Least reactive metals like Cu, Pt, etc do not reacteven with steam.                                                                    (1)