Which observation is a sign of a chemical change? a rotting potato gives off a bad smell. a melting block of ice leaves a large puddle. a cloud changes shape when blown by wind. a plaster statue breaks when it falls onto the floor.

it takes on an electronical energy

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.