Changes of State Answers

Which statement best describes the energy changes associated with evaporation and boiling?

As atoms gain energy, they move faster and slide past one another more easily. Atoms at the surface of the substance overcome attractions to nearby atoms and break free of the surface.

A cylinder at left with balls evenly spaced throughout the cylinder with an arrow leading to a cylinder at right with balls stacked near the bottom of the cylinder.

Which is the process by which a solid changes to a liquid?

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance lose energy during a change of state. Before the change, the atoms are close together but are able to slide past one another.

Brian made this table to organize his notes on changes of state.Which change of state has the wrong energy change listed?

During which changes of state do atoms overcome the attractive forces between them?

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls stacked near its bottom.

During which changes of state does the motion of the atoms decrease?

On a cool morning, Uyen’s breath can form a cloud when she breathes out. Which changes of state are most responsible for Uyen seeing her breath in this way?