Give an example of a combination reaction between an element and a compound.

Combination reaction: A synthesis reaction or combination reaction is a type of chemical reaction in which 2 or more reactants combine to form a single product.

Example: Formation of Sulphur trioxide (SO₃)

$\underset{(\mathrm{Sulphur}\mathrm{dioxide})}{2{\mathrm{SO}}_2\left(\mathrm{g}\right)}+\underset{\left(\mathrm{Oxygen}\right)}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{(\mathrm{Sulphur}\mathrm{trioxide})}{2{\mathrm{SO}}_3\left(\mathrm{g}\right)}$

In this example, Sulphur dioxide is a compound and Oxygen is an element.

Element: A pure chemical substance composed of the same type of atoms. Example: Oxygen molecule (O₂) contains 2 atoms of the same element called Oxygen (O).

Compound: A chemical substance in which two or more elements are present in a fixed proportion. Example: In Sulphur trioxide,