How matter changes forms State Changes How matter changes forms

Changing states Matter can change from one state to another when heat energy is released or absorbed. Although its physical state may change, its chemical state remains the same. This is called a change of state.

State Change Pyramid Gas Liquid Solid Melting Absorbing Releasing thermal energy Releasing thermal energy Gas Melting Liquid Solid

Melting The change from the solid state to the liquid state is melting. The temperature at which a substance changes from a solid to a liquid is called the melting point. Melting is when matter absorbs heat energy, and its temperature rises.

State Change Pyramid Gas Liquid Solid Melting Freezing Absorbing thermal energy Releasing thermal energy Gas Melting Freezing Liquid Solid

Freezing The change from the liquid state to the solid state is called freezing. The temperature at which a substance changes from the liquid state to the solid state is called the freezing point. Energy is released during freezing.

State Change Pyramid Gas Liquid Solid Evaporation Melting Freezing Absorbing thermal energy Releasing thermal energy Gas Evaporation Melting Freezing Liquid Solid

Evaporation The change from the liquid state to a gas state is known as evaporation. The temperature at which a liquid boils is called the boiling point.

State Change Pyramid Gas Liquid Solid Condensation Evaporation Melting Absorbing thermal energy Releasing thermal energy Gas Condensation Evaporation Melting Freezing Liquid Solid

Condensation As a gas cools, its particles slow down. The process of a gas changing to a liquid is called condensation. This process is the opposite of evaporation.

State Change Pyramid Gas Liquid Solid Condensation Sublimation Absorbing thermal energy Releasing thermal energy Gas Condensation Sublimation evaporation Melting Freezing Liquid Solid

Sublimation Some substances can change from the solid state to the gas state without ever becoming a liquid. This process is known as sublimation. Picture from http://www.ehow.com/how_2098268_fogsmoke-dry-ice-halloween.html

 Particles slide past each other  Definite shape  No definite volume  Definite volume  Particles close together  No definite shape  Particles move quickly Melting  Boiling  Condensation  Freezing  Evaporation  Sublimation