AP BIOLOGY

Detailed explanation-1: -Boiling is the process by which a liquid turns into a vapor when it is heated to its boiling point. The change from a liquid phase to a gaseous phase occurs when the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid.

Detailed explanation-2: -The bubbles rise through the water and escape from the pot as steam. The process in which a liquid boils and changes to a gas is called vaporization.

Detailed explanation-3: -Physical changes that involve a change of state are all reversible. Other changes of state include vaporization (liquid to gas), freezing (liquid to solid), and condensation (gas to liquid).

Detailed explanation-4: -During boiling, water changes from liquid to gaseous state. Hence it is a kind of physical change.

Detailed explanation-5: -Research shows that students frequently use the term chemical change to describe changes in physical state. Freezing and boiling are considered to be examples of chemical reactions.