Question

Complete the following table the first one is done for you:

Formula of compound	Elements present in the compound
CO2	Carbon and Oxygen
CaO	_____________ and ______________
PbO	_____________ and ______________
PbS	_____________ and ______________
CuS	_____________ and ______________
FeS	_____________ and ______________

Answer 1

Compound - It is a pure substance made by a chemical reaction of two or more different elements in a fixed proportion.

Chemical formula - The short representation of a compound using elemental symbols is called a chemical formula of that compound.

The chemical formula shows the different types of elements involved and the number of atoms in the compound.

Formula of compound	Elements present in the compound
CO2	Carbon and Oxygen
CaO	Calcium and Oxygen
PbO	Lead and Oxygen
PbS	Lead and Sulfur
CuS	Copper and Sulfur
FeS	Iron and Sulfur