phase changes matter can change from one state to another. this is known as a phase change. all...

PHASE CHANGES • Matter can change from one state to another. This is known as a Phase Change . • All Phase Changes are Physical Changes… The Identity of the substance does not change. • Energy must be added or removed.

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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 Changes…

The Identity of the substance does not change.

• Energy must be added or removed.

Page 2: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Chapter 3

Page 3: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Adding energy, a solid changes to a liquid.

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

MELTING

Page 4: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

When energy is removed from a liquid, it changes to a solid.

The process of changing from a liquid to a solid is called….

FREEZING

Page 5: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Freezing can occur at any temperature… high or low!

Page 6: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Adding energy changes a liquid to a gas

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

EVAPORATION

Page 7: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Changes of StateChapter 3

Page 8: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

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

Changing from a gas to a liquid…

CONDENSATION

Page 11: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Sometimes a solid will change directly to a gas.

Solid to Gas ….

SUBLIMATION

Page 12: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Dry Ice can be Dangerous!!

• This injury was caused by a dry ice bomb!

Page 13: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

A gas can change directly to a solid….

Frost is an example of this process, called…

DEPOSITION

Page 14: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

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: 2856o C ( 5173o F)

Page 15: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

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

• Liquid water’s “Freezing Point” is

0o C.

• Solid water’s “Melting Point” is 0o C.

Page 16: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Evaporation: Liquid to Gas

• Effects of Pressure on Boiling Point The boiling point of a liquid decreases as atmospheric pressure decreases.

• Atmospheric pressure is lower at higher elevations. So, the boiling point is lower on top of mountains than it is at sea level.

Page 17: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Boiling Points CAN change

• The normal boiling point of water is 100oC.

• But at an elevation of 10,000 feet water boils at only 90oC at this elevation.

Page 18: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Page 19: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Change of Temperature Vs. Change of State

• When most substances lose or gain energy either• its temperature changes• or its state changes.

• But temperature does not change until a change of state is complete.

Page 20: PHASE CHANGES Matter can change from one state to another. This is known as a Phase Change. All Phase Changes are Physical Changes… The Identity of the

Chapter 3

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