Burning wood
Irreversible
Cutting hair
Irreversible
Cooking an egg
Irreversible
Folding paper
reversible
Freezing an ice cube.
Reversible
Boiling water
Reversible
Rust on metal
Irreversible
Melting wax
Reversible
Breaking glass
Irreversible
Making a shape from playdough
Reversible
Baking a cake
Irreversible