Give an illustration of a thermal decomposition reaction.

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Solution

Calcium carbonate is strongly heated until it undergoes thermal decomposition to form calcium oxide and carbon dioxide.

$C a C O_{3}$ $h e a t - - \to C a O + C O_{2}$

Calcium oxide (unslaked lime) is dissolved in water to form calcium hydroxide (limewater). Bubbling carbon dioxide through this forms a milky suspension of calcium carbonate. Therefore after thermal decomposition we can obatin the original compound by reversing the process.

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The decomposition reaction in which cooling is involved is called thermal decomposition.

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