Question 2:

Write equations for the reactions of

(i) iron with steam

(ii) calcium and potassium with water

Answer

(i)    3Fe_(s)    +     4H₂O_(g)    →    Fe₃O_4(aq)              +       4H_2(g)

       Iron              steam            Iron(II, III) oxide            Hydrogen

(ii)  Ca_(s)   +   2H₂O_(l)   →     Ca(OH)_2(aq)  +   H_2(g)   +    Heat

2K_(s)          +    2H₂O_(l)  →   2KOH_(aq)                +      H_2(g)          +     Heat

Calcium/          Water         Calcium hydroxide/          Hydrogen

Potassium                          potassium hydroxide

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