Chemistry
(i) Under what conditions iron reacts with water?
(ii) Give the balanced equation of the reaction.
(iii) What is noticed if the products are not allowed to escape?
Hydrogen
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Answer
(i) Red hot iron reacts with steam, forming triferric tetra-oxide and hydrogen gas.
(ii) 3Fe + 4H2O ⇌ Fe3O4 + 4H2 ↑
(iii) If the hydrogen formed is not removed the iron oxide formed is reduced back to iron, as the reaction is reversible.
In the beginning, the forward reaction is fast and the backward reaction is slow. As the products are formed and the reactants get consumed the backward reaction becomes faster. There comes a time when the forward and the backward reactions acquire the same speed. An equilibrium stage is reached at 700°C and the amounts of the reactants and the products do not change.
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