Changing States

3.5C

Changing States Vocabulary

matter

gas

solid

liquid

heat

temperature

conductor

insulator

freezing

melting

evaporating

Matter

Matter is anything that has mass and takes up space.

Solids Solids have a

definite shape and volume.

Solids have mass. Solids take up

space.

Liquids Liquids have a

definite volume but no definite shape.

Liquids take the shape of their container.

Liquids have mass. Liquids take up space.

Gasses Gasses have no definite

shape or volume. Gasses spread out to fill

the entire space given. Gasses have weight. Gasses take up space.

States of Matter

What does it take for matter to move from one state to another?

Energy determines the state!

SOLIDS

LIQUIDS

GASES

+ Energy

+ Energy

Add or Subtract Energy. . .

When energy is added, particles move faster!

When energy is removed, particles move slower!

• Measure of the movement of molecules (tiny particles) in matter

• Measured using a thermometer or temperature probe

• Scientists use the Celsius scale to measure temperature

What will happen if heat is added? Why?

Solid + Energy = ?

When energy is added to solids, they become liquids!

Examples?

Liquid + Energy = ? When energy is

added to liquids, they become gasses!

What examples can you think of?

Changing States There are several names for matter changing states:

State change

Phase change

Physical change

Ice changes to water—water changes to ice, frozen water is still water

Water changes to steam, a gas, when it is heated to its boiling point, water vapor

condenses to form a liquid

Changes in State (phase changes)

1.Melting - solid to liquid

2.Freezing – liquid to solid

Changes in State (phase changes)

3.Evaporating – liquid to gas

4.Condensing - gas to liquid

So, did we get something new?

Ice cream and melted ice cream?

Chocolate and melted chocolate?

Ice, water, and water vapor?

Steel and molten steel?