Chapter 3: Metals and Non-metals

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Q
Metals and Non-metals

Question:

Write equations for the reactions of:

(i) iron with steam

(ii) calcium and potassium with water

Answer:

(i)- When iron reacts with steam, iron (II, III) oxide will form, along with the evolution of hydrogen gas.

3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4H2 (g)

 

(ii)- When a metal reacts with water, metal hydroxide will form along with the evolution of hydrogen gas.

Reaction of Calcium:  Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g)

 

Reaction of Potassium:  2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)


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