Identify two different objects that transform chemical energy into mechanical energy, and chose one object in the room and describe the energy transformation that occurs.

See the explanation below.

Explanation:

An example of chemical to mechanical energy is that of a battery for a toy car, the chemical energy of the battery is used to produce movement of the toy car.

And another example is the coal, its energy is used for water heating and steam generation to move a turbine (make the turbine turn).

If in my room I take a book that is on top of a shelf, its energy changes from potential to kinetic energy as I move it with my hand and decreased the height of the book relative to its initial value.