Solid calcium oxide was taken in a container and water was added slowly to it.
(i) State two observations made in the experiment.
(ii) Write the chemical formula of the product formed.

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Solution

Part (i) The observations made in the following experiment:
When solid Calcium oxide $(C a O)$ reacts with water, Calcium hydroxide $(C a (O H)_{2}$ is formed along with the evolution of heat.

(a) The temperature of the container start increasing and water starts converting into the gaseous phase.

(b) This is an example of an exothermic reaction because a large amount of heat evolved during the reaction.
Part (ii) Chemical formula of the compound formed
$C a O (s) + H_{2} O (a q) \to C a (O H)_{2} (s) + h e a t$
Hence, the chemical formula of the product Calcium hydroxide is $C a (O H)_{2}$ which is also known as Slaked lime.

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Solid calcium oxide was taken in a container and water was added slowly to it. (i) State two observations made in the experiment. (ii) Write the chemical formula of the product formed.

Solid calcium oxide was taken in a container and water was added slowly to it.
(i) State two observations made in the experiment.
(ii) Write the chemical formula of the product formed.