Physical Phase Changes Physical Changes in Matter Matter

Physical Phase Changes

Physical Changes in Matter » Matter can change physically » It however will remain the same substance, but in a different form. » Examples: melting, freezing, boiling 2

Phase Change Diagram

Phase Change Diagram Plateau - Temperature does not increase

Melting Point solid turns to liquid absorbs heat energy as atoms speed up ● ex. Ice melts at 0°Celsius

Freezing point liquid turns to solid releases heat energy as atoms slow down ● ex. Water freezes at 0°Celsius

Decrease in Temperature

Vaporization Change of state from liquid to a gas ● Boiling occurs at a liquid’s boiling point and occurs throughout the liquid. Ex. Water boils at 100 ° C

Vaporization Evaporation water evaporates slowly from the surface of the liquid. Ex. Water absorbs energy from your skin, you feel cooler

Temperature Increases

Sublimation Process of changing a solid to a gas directly without the liquid stage. Absorbs heat as atoms increase speed. ● Ex: Dry ice (frozen CO 2) sublimes

● Condensation Process of changing a gas to a liquid. Releases heat as atoms slow down. Example: water condenses on mirror when taking a hot shower.

Phase Diagram D E B A C

Exothermic reaction- chemical reaction in which energy is released or removed. Cold reaction Endothermic reactionchemical reaction in which energy is absorbed. Hot Rx.