Question

Which is an example of a chemical change?

Answer 1

hint:
any chemical reaction can be considered a chemical change

Answer 2

for example the reaction of production of water, starting from hydrogen and oxygen:
\[\large {{\text{H}}_{\text{2}}}\left( g \right) + \frac{1}{2}{{\text{O}}_{\text{2}}}\left( g \right) \to {{\text{H}}_{\text{2}}}{\text{O}}\left( l \right)\]