Question

angelina has left her ice cream out in the sun and is observing it turn into a liquid. which answer best explains what phase change has occurred and how the molecule movement has changed?
sublimation: molecules transition directly to gas without liquid.
freezing: molecules become more compact and rigid.
melting: molecules move from a fixed position to a more fluid state.
condensation: molecules slow down and gather into a solid form.

Explanation:

Step1: Analyze the phase change

The ice cream is changing from solid (ice cream) to liquid. Melting is the process where a solid turns into a liquid.

Step2: Match with the given options

The description of melting is "molecules move from a fixed position to a more fluid state" which is what happens when ice cream melts.

Answer:

Melting; molecules move from a fixed position to a more fluid state.