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Phase Changes: A Comprehensive Guide to States of Matter, Schemes and Mind Maps of Physical Chemistry

Rice UniversityPhysical Chemistry

Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Change. Endothermic Page 4 Phase Changes ...

Typology: Schemes and Mind Maps

2022/2023

Uploaded on 03/01/2023

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PHASE CHANGES
•Matter can change from one state to another.
This is known as a Phase Change.
•All Phase Changes are Physical Change.
•When energy is added or removed, 1 of 2
things happen:
•Temperature of substance changes
•There is a change in state
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Download Phase Changes: A Comprehensive Guide to States of Matter and more Schemes and Mind Maps Physical Chemistry in PDF only on Docsity!

PHASE CHANGES

  • Matter can change from one state to another.

This is known as a Phase Change.

  • All Phase Changes are Physical Change.
  • When energy is added or removed, 1 of 2

things happen:

  • Temperature of substance changes
  • There is a change in state

Phase Changes

Endothermic vs. Exothermic

Phase Changes

Endothermic vs. Exothermic

Adding energy, a solid changes

to a liquid.

The process of changing a solid to a liquid is called:

MELTING

Freezing can occur at any

temperature… high or low!

Adding energy changes a liquid

to a gas

If this phase change occurs below the boiling point, it is called….

EVAPORATION

Sweat is your body’s natural air

conditioner!

In order for sweat to evaporate, it needs to absorb heat from your body. This cools your skin!

If boiling occurs to change the

liquid to a gas…

This is known as

VAPORIZING

Sometimes a solid will change

directly to a gas.

Solid to Gas ….

SUBLIMATION

Dry Ice can be Dangerous!!

  • This injury was caused by a dry ice bomb!

The temperature at which a substance changes

phase is unique for that substance and is used to

help identify it.

For example: The Boiling Points (at sea level)…

Oxygen: -182.95o^ C (-297.31o^ F)

Bromine: 58.8o^ C ( 137.8o^ F)

Gold: 2856 o^ C ( 5173o^ F)

“Freezing Point” = “Melting Point” (What you call it depends on what you start with.)

  • Liquid water’s “ Freezing Point ” is 0 o^ C. - Solid water’s “ Melting Point ” is 0 o^ C.