Question 42

Particles become less ordered

As solids transition into liquids, one of the key changes is that the particles become less ordered. This increase in disorder is a fundamental characteristic of the phase change from solid to liquid.

A) Particles become less ordered

This option accurately describes a significant aspect of the transition from solid to liquid. In a solid, particles are arranged in a fixed, orderly structure. As the solid melts, this order is disrupted, leading to a more random arrangement of particles typical of liquids.

B) Particles increase in mobility

While this statement is true to some extent, it is a consequence of the particles becoming less ordered. Increased mobility reflects the ability of the particles to move past one another, but it does not fully capture the essence of how solids transition into liquids, which is primarily characterized by the loss of order.

C) Particles move further apart

This option can be misleading. Although particles in a liquid are generally closer together than in a gas, they do occupy more space than in a solid due to increased kinetic energy. However, the primary change during melting is the decrease in order rather than just distance between particles.

D) Intermolecular forces between particles weaken

While it's true that intermolecular forces become less effective during the transition, this option does not encapsulate the overall change that defines the transition from solid to liquid. The weakening of these forces is a result of the loss of order, rather than a standalone summary of the phase change.

Conclusion

The correct answer, "Particles become less ordered," encapsulates the primary change occurring during the phase transition from solid to liquid. While other options touch on related aspects, they do not comprehensively summarize the key characteristic of the transition, making Option A the most accurate choice.