Science
Identify the type of each of the following reactions stating the reason for your answers.
(a) Fe2O3 + 2Al → Al2O3 + 2Fe + heat
(b) Pb(NO3)2 + 2KI → PbI2(↓)+ 2KNO3
Chemical Reaction
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Answer
(a) This is an exothermic displacement reaction, which is also a redox reaction in which aluminium (a stronger reducing agent) reduces iron(III) oxide to iron, while itself getting oxidized to aluminium oxide and the large heat released is characteristic of the thermite reaction.
(b) This is a double displacement reaction that is specifically a precipitation reaction in which ions exchange partners to form insoluble lead(II) iodide, PbI2, which appears as a yellow precipitate, while KNO3 remains in solution.
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