Question

write a reaction for the reaction of 1) iron with stem 2) calcium with water 3) potassium with water​

Answer 1

(i) Iron react with steam to form the metal oxide and hydrogen.

3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)

(ii) The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire.

Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)

Answer 2

Answer:

1- 3 Fe (s) + 4 H20 (g) - Fe 304 (s) + 4H2 (g)

2- ca (s) +2 H20 (l) - ca (oH) 2 (aq) + H2 (g)

3- 2k(s) + 2H2o (l) - 2 koH (aq) + H2 (g) + heat energy