Changes of State

Bell RING

What are the three States of Matter and how are the atoms arranged?

Changes of Matter

Lesson 1/25

CHAMPS

Lesson Objective

1.Describe what happens during the different changes of state.

2.Explain how energy is related to changes of state.

Chemical Change

-Cannot be reversed by physical change.

Example: Baking a cake.

-New Substance with different properties.

Example: Rust on metal or car.

How to indicate a change in matter Chemically

• New odor

• Change of energy

• Change of color

• Formation of bubbles

• Formation of a solid

Multiple Choice

How is temperature related to the physical change of a substance?

• Temperature is a measure of the kinetic energy of particles in a substance.

• A change in the energy of particles causes a change in their arrangement.

• As temperature increases, the atoms or molecules in a substance gain energy.

• As temperature decreases, the particles lose energy. A change in the arrangement of particles can lead to a physical change.

• All the above.

Solid to Liquid

Melting=solid to a liquid using a melting point of matter.

-Butter solid to a liquid

-Atoms close together gain energy slide against each other.

Multiple Choice

At lunch, the babysitter gives Tanya and Damien each a chocolate candy. Tanya puts her candy on her plate. Damien saves his candy in his pocket. After lunch, Damien discovers his candy has melted. Which statement accurately compares the atoms in the two candies?

• The atoms in Damien’s candy are unable to move.

• The atoms in Damien’s candy are vibrating faster.

• The atoms in Damien’s candy have less energy.

Solid to Gas

• Sublimation-Process in which a solid becomes a gas.

• Example DRY ICE- Goes from solid to a liquid.

• Low air pressure and large amounts of energy.

• Atoms over come attraction as move away from each other.

Liquid to Gas

Vaporization the process by which liquid becomes a gas.

-Evaporation-occurs at the surface of a liquid. Atoms overcome attraction.

-Boiling take place below the surface of a liquid. Atoms gain energy.

-Liquid absorbs thermal energy.

-Atoms gain energy.

-Atoms move faster.

-Atoms escape from the surface.

Gas to Liquid

• Condensation is the process by which a gas becomes a liquid.

• As the temperature decreases, the atoms do the following

• Lose Energy and Move Slower.

• The attraction among atoms cause liquid to form.

Poll

What happens to the atoms in a scoop of ice cream as it melts?

• They are held tightly in a fixed position.

• They decrease in temperature.

• They lose energy.

• They vibrate faster.

Open Ended

Explain the process that causes dew to form on blades of grass.

Explain the process that causes dew to form on blades of grass.

• As the temperature decreases, the atoms in a gas lose energy.

• The atoms move slower.

• The attractions among atoms cause liquid to form.

• This process is called condensation.

Gas to Solid

Deposition-is the process by which a gas becomes a solid.

-Atoms lose large amount of thermal energy.

-Atoms slow down quickly.

-Atoms are held tightly by strong attraction.

Review of TODAY's lesson objectives

• 1.Describe what happens during the different changes of state.

  
  

• 2.Explain how energy is related to changes of state.