Question

7. Name the following compounds and also name the elements present in each of them. (You can ignore the numbers when naming these compounds.)

ii. $\mathrm{CaO}$

Answer 1

Part 1: Definition of compound:

A compound is defined as a pure substance that is made up of two or more elements in a fixed ratio by mass.

Part 2: Name of $\mathrm{CaO}$:

• Elements combine with oxygen to form oxides.
• The name of $\mathrm{CaO}$ is Calcium oxide. It is also known as Quick lime.
• The elements present in $\mathrm{CaO}$ are calcium $\left(\mathrm{Ca}\right)$ and oxygen $\left(\mathrm{O}\right)$.

Hence, the name of $\mathrm{CaO}$ is Calcium oxide.