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Question

Give one example of a combination reaction which is also exothermic.

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Answer

When quicklime or calcium oxide (CaO) reacts with water, slaked lime [Ca(OH)2] is formed. During this reaction, a large amount of heat is released. So, this reaction is an exothermic Reaction.

.                     𝐶𝑎𝑂(𝑠)                               + 𝐻2𝑂(𝑙)      →              𝐶𝑎(𝑂𝐻)2(𝑎𝑞) + ℎ𝑒𝑎𝑡

𝑐𝑎𝑙𝑐𝑖𝑐𝑖𝑢𝑚 𝑜𝑥𝑖𝑑𝑒 (𝑞𝑢𝑖𝑐𝑘 𝑙𝑖𝑚𝑒)                𝑤𝑎𝑡er              (𝑐𝑎𝑙𝑐𝑖𝑢𝑚 ℎ𝑦𝑑𝑟𝑜𝑥𝑖𝑑𝑒(𝑠𝑙𝑎𝑘𝑒𝑑 𝑙𝑖𝑚𝑒)

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