Write two observations you make when quicklime is added to water.

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Solution

Quicklime is Calcium oxide $(CaO)$ .
When Quicklime is added to water, the following changes are observed:
Heat is evolved- which indicates that this is an exothermic reaction.
Slaked lime (Calcium hydroxide) is produced as a product- which is used for whitewashing.
The reaction can be written as:
$CaO (s) + H_{2} O (l) \to Ca {(OH)}_{2} (s) + ∆ (Calcium oxide) (water) (Calcium hydroxide)$

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