Describe the motion of molecules in these two substances when the ice cube is placed on the radiator?

the molecules in those two substances would both heat up and start moving very quickly

Describe the motion of molecules in these two substances when the ice cube is placed on the radiator. Molecules in an ice cube have lower kinetic energy than molecules in a radiator. ... When in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube.

the answer your looking for is c).