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Write two observations when quicklime is added to water.

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Detailed Solution

When quicklime (calcium oxide) is added to water, it reacts vigorously to form slaked lime and releases heat.

Observations:

The mixture becomes hot and steamy due to the exothermic reaction.
A white powdery or milky substance, slaked lime (Ca(OH)₂), is formed.

The chemical reaction is: CaO + H₂O → Ca(OH)₂ + heat. This reaction is used in whitewashing and making mortar. The heat produced can even cause water to boil if large amounts of quicklime are used.

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