(ZAMASAAT)Physical and Chemical Change .

• Physical Changes are changes in matter without its identity(chemical composition).
• Breaking a glass, Cutting of paper, Diamond polishing and Changing State are all example so of physical changes.
• There are 2 type so of Physical Change: Endothermic and Exothermic.
• Endothermic: absorb energy (take energy in), EX: melting, boiling, evaporation and sublimation.
• Exothermic: releases energy (give energy out), EX: freezing, condensation, combustion and deposistion.
• State of matter

  Depends on surrounding temperature and pressure
• Melting


  1. Changes from solid to liquid

  2. Example: ice to water
• Evaporation


  1. Changes from liquid to gas

  2. Example: water to vapor
• Boiling Point


  The temperature at which vapor pressure equals the atmospheric pressure
• Freezing

  1. Changes from liquid to solid

  2. Example: water to ice
• Condensation


  1. Changes from gas to liquid

  2. Example: vapor to water
• Sublimation

  1. Changes from solid to gas directly without passing through the liquid state

  2. Example: naphthalene (moth balls) can sublimate directly to gas
• Deposition

  1. Changes from gas to solid directly without passing through the liquid state

  2. Example: naphthalene gas can directly change to solid when cooled