list three examples of matter changing from one state to

List three examples of matter changing from one

state to another.

COS 7 : Describe the states of matter based on kinetic energy of particles in matter.

It’s a Matter of Energy


Text book Pages 50 – 55 and 76 - 81

Matter changes from one state to another.

I don’t think so…not THAT kind of state!


Changes in Matter• Matter can undergo physical or chemical

changes.• Definition – A physical change is any

change that alters the form or appearance of matter, but does not make it into a different substance.

• Changes of state from one phase of matter (solid, liquid, or gas) to another is a physical change.


Changes in Matter• Other examples of physical changes

include dissolving, bending, crushing, breaking, chopping, or anything else that changes ONLY the shape or form of matter.


Changes in Matter• Definition – A chemical change is a

change in matter that produces one or more new substances.

• A single substance can change into one or more new substances.

• Two or more substances can combine to form different substances.


Changes in Matter• A chemical change produces new

substances with properties that are different from those of the original substances.

• Some examples of chemical changes include combustion, electrolysis, oxidation, and tarnishing.


Law of Conservation of Mass(Law of Conservation of Matter)

• Anton Lavoisier was a French chemist who performed experiments to show that no mass was lost or gained during a chemical change.

• The law of conservation of mass states that matter is not created or destroyed in any chemical or physical change.

• When matter changes, the particles of matter are rearranged.


Matter can change from one physical state

to another through shifts of energy.


Changes in Matter• Definition – Energy is the ability to do

work or cause change.• Every chemical or physical change in

matter includes a change in energy.• Definition - Thermal energy is the total

energy of all the particles in an object.• Thermal energy always flows from

warmer matter to cooler matter.COS 7 : Describe the states of matter based on kinetic energy of particles in matter.

Changes in Matter• Temperature and thermal energy are not

the same.• Temperature is, however, related to the

thermal energy that matter has.


What phase something takes is a matter of energy.

Explain how by adding or taking away energy you can change a liquid cup of coffee into a gas or a solid.


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Phase change involves energy.

How does the amount of energy in a substance affect the phase it is in?


You can take matter from one state to another byadding or removing energy.

Watch this!

Changes Between Liquid and Solid

• Substances change state when its thermal energy increases or decreases sufficiently.

• Particles of a liquid have more thermal energy than particles of the same substance in a solid form.



• Definition – Melting is a change in state from a solid to a liquid that involves an increase in thermal energy.

• For each substance melting occurs at a specific temperature called the melting point.

• At its melting point, the particles of a substance are vibrating so fast that they break free from their fixed positions.



• Definition – Freezing is a change in state from a liquid to solid that involves an decrease in thermal energy.

• At its freezing point, the particles of a liquid are moving so slowly that they begin to form regular patterns.


Solids turn to liquids, and liquids turn back into solids if energy is taken away from them.

If a gas is superheated, it loses its electrons and becomes plasma.COS 7 : Describe the states of matter based on kinetic energy of particles in matter.

Changes Between Liquid and Gas

• Definition – Vaporization occurs when the particles in a liquid gain enough energy to form a gas.

• There are two types of vaporization:– Evaporation– Boiling


Changes Between Liquid and Gas

• Definition – Evaporation is vaporization that takes place only on the surface of a liquid.

• An example is a shrinking puddle of water.

• Definition – Boiling occurs when a liquid changes to a gas below its surface as well as at the surface.


Changes Between Liquid and Gas• The boiling point is the temperature at which a

liquid boils and can be evidenced when the liquid bubbles.

• Boiling point depends on the pressure of the air above it.

• The lower the pressure, the less energy needed for the particles of the liquid to escape into the air, the lower the boiling point.

• The higher above sea level a location is, the lower the air pressure.


Changes Between Liquid and Gas• Condensation is the opposite of

vaporization.• Definition – Condensation occurs when

particles in a gas lose enough thermal energy to form a liquid.

• Water vapor is a colorless gas that is impossible to see.


Changes Between Liquid and Gas• Steam, clouds, and fog are not water

vapor.– They are tiny drops of liquid

suspended in air.• Chemists use melting and boiling

points to help identify unknown substances.


Changes Between Solid and Gas

• Definition – Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.

• During sublimation the particles of a solid do not pass through the liquid state as they form gas.

• Example: Dry ice


Changes Between Solid and Gas

• Definition – Deposition occurs when the particles of a gas lose enough energy that they form regular patterns and become solid.


The sublimation

of solidcarbon dioxide

(dry ice).


Would it turn into a liquid or into a gas?COS 7 : Describe the states of matter based on kinetic energy of particles in matter.

If it turned into a liquid it would becalled ,

if into a gas, . Actually, diamonds sublimate,

forming carbon dioxide gas when heated high enough.


A. Solid to liquid ____ 1.DepositionB. Solid to gas ____ 2.CondensationC. Liquid to gas ____ 3.MeltingD. Gas to solid ____ 4.FreezingE. Liquid to solid ____ 5.SublimationF. Gas to liquid ____ 6.Boiling

D.F.A.E.B.C.


Name the most common form of matter in the universe.

Name two examples of substances that freeze

at room temperature.COS 7 : Describe the states of matter based on kinetic energy of particles in matter.

Is it possible to have matter existing in all three phases:

solid, liquid, and gas,

at the same time?


list three examples of matter changing from one state to

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