What is Change of State?Change of StateA change of state is when matter changes its physical form, such as when a solid melts to form a liquid, or when a liquid is heated to form a gas. Changes of state are physical, not chemical, changes. The matter itself does not change its chemical composition.solidliquidgasliquidPhysical States & Thermal EnergyThe physical state of matter is related to the thermal energy of the particles and the amount of movement of the particles. Matter that is solid has the least amount of thermal energy and the particles have very little movement. Liquids have more thermal energy and the particles exhibit more movement. Gases contain the most thermal energy and the particles are in constant motion. solidleastmostthermal energyliquidgasChanges of state occur when matter gains or loses thermal energy. For example, a liquid can gain thermal energy when it is heated. The particles move faster, and the liquid matter changes to a gas. If a liquid is cooled, it loses energy and the particles slow down. The liquid then changes to a solid. Changes that occur when energy is added to matter are called endothermic, and changes that occur when energy is removed or lost are called exothermic.exothermicendothermicenergy addedenergy lost© Copyright NewPath Learning. All Rights Reserved. 94-4828Visit www.newpathlearning.com for Online Learning Resources.A change of state is when matter changes its physical form, such as when a solid melts to form a liquid, or when a liquid is heated to form a gas. Changes of state are physical, not chemicalt, changes. The matter itself does not change its chemical composition.solidlliiiiiiqqqqqqqqqqqquidgasqqqqqqqqqqqqqqqqqqqlllllllliquiduiliquidq iddidqqqqqqqqqqqqliliThe physical state of matter is related to the thermal enerrggggggggggggggggggyyyyyyyyyyyyyyyyyyy oooooooooooooooffffffffffffff ttttttthhhhhhhhhhhhheeee ppppppppppppppaaaaaaaaaaarrrrrrrrrrrtttttttttttttiiiiiiiiiicccccccccccccllllllles aaaaaaaaaaaaaaaannnnnnnnnnnnnnnnnddddddddddddd tttttttttthhhhhhhhhhhhhhhhheeeeeeeeeeee aaaaaaammmmmmmooooooooooooouuuuuuuuuuuuunnnnnnnnnnnnnnnt of movement of the ppaarrttiicclleess.. 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