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.

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false