Chirality means an object is not superimposable on its mirror image. An object is achiral (not chiral) if it has a plane of symmetry.

Ceiling Fan: Achiral. It has a vertical plane of symmetry.

Screw: Chiral. A standard screw has a right-handed thread and is not identical to its left-handed mirror image.

Hockey Stick: Chiral. A curved hockey stick is not superimposable on its mirror image.

Kid Tricycle: Achiral. It typically has a symmetrical design with a plane of symmetry down the center.

Final Answer: Screw and Hockey stick are chiral.