Question

which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3?
the particles are slower in region 3.
the particles are more orderly in region 1.
the particles have more kinetic energy in region 1.
the particles have less freedom of motion in region 3.

Explanation:

Based on the principles of particle behavior in different states (related to temperature changes shown in the graph), in region 1 (higher temperature, likely gas or liquid - more disordered) and region 3 (lower temperature, likely liquid or solid - more ordered). Kinetic energy is related to temperature (higher temp = more kinetic energy). Particle freedom of motion is inversely related to order (more ordered = less freedom). Particle speed is related to kinetic energy (higher energy = faster speed).

Answer:

The particles are more orderly in region 1.