According to the definition of compounds, two or more elements combine together chemical to form a new substance called compound.
When two or more substances (element or compounds) react together to combine and form a new product, which is a compound with new properties. They synthesize to form a new substance, hence it is called a synthesis reaction. Example: C + O 2 → C O 2 C+O_2\ →\ CO_2 C+O2 → CO2.
A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.