The Heating/Cooling Curve of a Pure Substance

State A 

• solid
• closely packed particles
• forces between particles are strong 
• only vibrate at a fixed position   

State A-B

• heat is converted to kinetic energy
• energy increases
• vibrate faster
• temperature increases

State B

• solid starts to melt or freeze

State B-C

• solid & liquid states
• constant temperature = melting point

State C

• completely melted
• solid turns to liquid

State C-D

• in liquid state
• molecules gain heat energy + temperature continue to increase
• particles move faster and faster ( because kinetic energy is increasing)

State D

• still in liquid state
• molecules starts to move freely

State D-E

• exist in liquid - gaseous states
• temperature is unchanged
• constant temperature = boiling point

State E

• liquid to gas

State E-F

• moves faster ( as gas particles absorbs energy)
• temperature increases

 So that's basically what we did in class last friday. We took some notes and did some reading about  MATTER, which you will find out more later on after we "summarize" what's in the textbook.

Now here's  the song of the day for your own pleasure.
Its called the "Atom Rap"
Enjoy!