PHASE TRANSITION = a physical change of a substance from one
energy state of matter to another
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PHASE TRANSITIONS = a physical change of a substance from one energy state of matter to another
SOLID
LIQUID
GAS

SOLIDIFICATION
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The change of state from LIQUID to SOLID of a substance
which is a solid at room temperature
i.e.
when a molten substance cools
FREEZING


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The change of state from LIQUID to SOLID of a substance
caused by COOLING a liquid


external image C:%5CUsers%5CANIELA~1.ARR%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_image004.gifMELTING
the change from SOLID to LIQUID

Melting Point – the temperature at which a solid substance changes into a liquid – (this is the same temperature as its Freezing Point.) Every substance has its own unique melting point.

usually caused by HEATING
LIQUIFICATION


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the change of state from GASEOUS to LIQUID of a substance which is
a GAS at room temperature
caused by COOLING
CONDENSATION


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the change of state from GASEOUS to LIQUID of a substance
which is a LIQUID at room temperature

usually caused by COOLING
FUSION


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the change of state from SOLID to LIQUID of a substance
which is a solid at room temperature

MOLTEN (adj) describes the liquid state of a substance
which is solid at room temperature


VAPORISATION
any change resulting in a gaseous state
external image C:%5CUsers%5CANIELA~1.ARR%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_image008.gifEVAPORATION
The change of state from LIQUID to GASEOUS (VAPOUR) due to the escape of molecules from the surface.
A liquid which evaporates easily is called VOLATILE.
external image C:%5CUsers%5CANIELA~1.ARR%5CAppData%5CLocal%5CTemp%5Cmsohtmlclip1%5C01%5Cclip_image009.gifBOILING
The change of state from LIQUID to GASEOUS at a temperature called the boiling point. It occurs by the formation of bubbles throughout the liquid.
All pure samples of the same liquids have the same boiling point.
An increase in pressure increases the boiling point.
SUBLIMATION





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The change of state from SOLID directly to GASEOUS on HEATING
i.e. the substance does NOT go through the LIQUID stage.

The change of state from GAS directly to SOLID on COOLING
i.e. the substance does NOT go through the LIQUID stage.