Question

1. a puddle of rainwater slowly disappears on a warm sidewalk. type of change: explanation:

Explanation:

The puddle of rainwater disappearing is a physical change. In this process, liquid water ($H_2O$) changes to water vapor ($H_2O$ gas) through evaporation. No new substance is formed; it's just a change in the state of matter (from liquid to gas), which is characteristic of a physical change.

The rainwater (liquid water) evaporates to become water vapor (gaseous water). No new substance is created, only the state of water changes, so this is a physical change.

Answer:

Type of change: Physical change